Bolthole Index

Marion County, Oregon

Building permits, zoning and septic rules in Marion County, Oregon

47Index Score / 100
#30 of 36 in Oregon

Unincorporated Marion County, Oregon requires building permits for homes and related structures through Marion County Building Inspection12. Marion County Planning administers zoning on all unincorporated land, while city jurisdictions review zoning inside their limits345. Marion County Building Inspection issues onsite septic permits as Oregon DEQ’s contract agent, with DEQ retaining certain systems67.

At a glance

Building permit
Required to build, enlarge, alter, move or replace a home or related structure; accessory structures like carports, garages and sheds over 200 sq ft also need one81
Zoning
Yes; Title 17 applies outside urban growth boundaries and Title 16 applies to unincorporated land within them910
Septic permits
Required through Marion County Building Inspection under DEQ rules, except systems reserved to DEQ; confirm city-specific routing11712
Owner-builder exemption
Qualifying owner-built dwellings and outbuildings receive limited structural-code relief; qualifying homeowner work on family-owned residential or farm property is also exempt from contractor licensing1314
RV living
Limited to 120 days per calendar year on unincorporated property with a dwelling; the same cap can apply to a vacant lot in the AR, SA, FT or TC zone if all conditions are met1516
Agricultural buildings
A structural-code exemption is available after county approval for qualifying non-dwelling farm, forestry and equine buildings17
EFU parcel creation
The calculated minimum cannot be less than 80 acres for a new farm parcel, with other criteria and exceptions18
Tiny homes
A wheeled tiny house generally cannot be a permanent dwelling or ADU; a non-wheeled tiny house can be an urban ADU if it meets all ADU standards192021

Who to call

Building permits

Marion County Building Inspection

New-construction and remodeling plan review in unincorporated Marion County and for cities without their own building inspection programs

503-588-5147

Building@co.marion.or.us

5155 Silverton Road NE, Salem, OR 97305

Online permits →

Septic permits

Marion County Building Inspection - Onsite Sewage Disposal Program

Septic (onsite sewage disposal) site evaluations, construction/installation permits, alterations, repairs and inspections for Marion County, as DEQ's contract agent

503-588-5147

Zoning

Marion County Planning Division

Zoning administration, land-use approvals and floodplain development review for unincorporated Marion County under the county Comprehensive Plan

503-588-5038

Planning@co.marion.or.us

5155 Silverton Rd NE, Salem, OR 97305

Floodplain permits

Marion County Floodplain Program

Floodplain-map checks, floodplain development permits, development regulations, flood-insurance data and available elevation certificates for unincorporated Marion County

(503) 588-5038

planning@co.marion.or.us

Roads & driveways

Marion County Public Works Land Development Engineering & Permits

Driveway access permits for covered work within the public right-of-way

(503) 584-7714

5155 Silverton Rd NE Salem, OR 97305

Contact details are copied from each office’s official page and were checked against it on October 14, 2026.

Off-grid gear

Going off-grid in Marion County means bringing your own water and power. The kit we’d start with:

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Do you need a building permit in Marion County, Oregon?

Unincorporated Marion County requires a building permit to construct, enlarge, alter, move or replace a home or related structure; Oregon’s statewide building code supplies the construction standards122. Listed minor repairs may be exempt, but separate electrical, plumbing or mechanical permits can still apply1. Qualifying non-dwelling agricultural, forestry and equine buildings need county approval for structural-code exemption17. Oregon’s owner-builder exemption covers only ceiling heights, room sizes and temperature maintenance: the owner must intend to occupy the home, build entirely personally or with unpaid friends and relatives, and not have used the exemption in the preceding 5 years23. A building permit remains required, and an exempt noncompliant structure requires filing the permit with the county clerk for deed recording23. Qualifying work on family-owned residential or farm property can separately qualify for contractor-licensing relief14.

Who is the Marion County building department, and how do you reach them?

Marion County Building Inspection handles building permits for unincorporated land at 5155 Silverton Road NE, Salem, OR 97305; call 503-588-5147 or email Building@co.marion.or.us2. Inside cities, start the building-permit application at city hall24. St. Paul issues its building permits, with Marion County performing plan review and inspections; onsite septic permits remain with Marion County Building Inspection except DEQ-reserved systems2526. The county’s inspection list for a new single-family home is general and varies with design and materials, and the structural final inspection comes after all work is complete and before occupancy; septic work must be approved before the plumbing or structural final2728. New dwellings and townhouses need a certificate of occupancy or a temporary certificate, and the contractor-information form must be submitted before issuance2930.

Does Marion County have zoning?

Marion County Planning administers zoning on all unincorporated land: Title 17 applies outside urban growth boundaries and Title 16 within them103. Site plans are reviewed by either Marion County Planning or the city jurisdiction4. Keizer, Gervais, Aurora and St. Paul set their own zoning31323334. Septic remains with Marion County Building Inspection in Keizer, Aurora and St. Paul, except DEQ-reserved systems; Gervais’s listed septic responsibilities differ, so confirm the application route before filing35362612.

New AR subdivisions and partitions generally require 2-acre lots; the calculated EFU minimum for a new farm parcel cannot be below 80 acres3718. AR houses generally need 20-foot front and rear setbacks and 10-foot side setbacks, with a 35-foot height cap3839. New EFU structures other than farm-exempt buildings need 20 feet front, rear and side, and EFU dwellings have a 35-foot height cap; non-farm dwellings also need 200 feet from abutting farm or timber parcels unless the alternative-site criteria are met4041.

What lot sizes and setbacks apply in Marion County’s urban zones?

In unincorporated Marion County’s RS zone, single-family lots generally need 6,000 square feet; qualifying subdivisions approved after the ordinance’s effective date inside the Salem/Keizer urban growth boundary can use 4,000 square feet42. RL requires 4,000 square feet for detached homes and 6,000 for duplexes; RM requires at least 6,000 square feet for multiple-family dwellings and other uses, with additional density and planned-development provisions4344.

RS front yards inside the Salem/Keizer boundary are generally 12 feet, or 20 feet for street-facing garages; other urban growth boundaries require 20 feet, and arterial or collector streets can require greater setbacks45. RL generally requires a 12-foot front yard and 5-foot side and rear yards, with larger setbacks for street-facing garages, arterial or collector streets, and specified taller buildings adjoining RS land46. Ordinary structures in RS, RL and RM have a 35-foot height limit, with specified exceptions474849. Urban subdivision and partition approval also requires compliance with street, utility, drainage and plat requirements50.

How do septic permits work in Marion County?

Marion County Building Inspection administers onsite septic permits as Oregon DEQ’s contract agent; DEQ supplies the statewide siting, design and installation rules651. Where municipal sewer is unavailable, Oregon requires an onsite septic system, and the lot must have room for an initial and a replacement system52. Community-sewer properties are outside the onsite program, and systems over 2,500 gallons per day go to DEQ7. Marion County requires a field visit when an existing system is more than 5 years old or lacks an installation record7. The published fee schedule lists $1,029.25 for a first-lot single-family site evaluation and $1,224 for a standard installation permit, including DEQ surcharges53. Only 7.7% of Marion County soils lack severe limitations for conventional drain fields, making site evaluation an early purchase decision54.

Can you live in an RV or tiny home on your land in Marion County?

Unincorporated Marion County allows one RV space on rural property with a dwelling for no more than 120 days per calendar year, subject to RV standards5515. A vacant AR, SA, FT or TC lot can have one RV space under the same cap only if it meets non-resource-dwelling standards16. Wheeled tiny houses generally cannot be permanent dwellings or ADUs1920. Campgrounds are a different use: a private FT-zone campground limits any camper to 30 days in a consecutive six-month period and cannot provide individual utility hookups56, and licensed recreation parks are inspected by Marion County Environmental Health57.

Eligible ADUs outside city limits but within urban growth boundaries need a county building permit, without a land-use application, and only one ADU is allowed per parcel5859. A non-wheeled tiny house must meet all ADU standards21. An urban manufactured-home ADU must meet ADU standards, be Energy Star certified and bear a HUD certification label60; rural ADUs are limited to AR land over 2 acres under the zone’s additional conditions61. Oregon also requires owner consent and approved water, sewage and utility standards for manufactured-dwelling occupancy62. When replacing a lawfully established manufactured dwelling in rural AR, the old dwelling must be removed or demolished within 90 days after occupying the replacement63.

How do you build a home in Marion County, step by step?

  1. Ask Marion County Planning or the applicable city zoning office to identify the parcel's zone and confirm the dwelling, setbacks and access64.
  2. Determine whether community sewer is available; otherwise begin Marion County's septic evaluation and septic-permit process6511.
  3. If the landowner will personally construct, alter or abandon a well, obtain the state landowner permit before work begins66.
  4. Obtain a county driveway access permit for covered work in the public right-of-way6768.
  5. Submit the building-permit application directly to Marion County Public Works for unincorporated land, or start at city hall for property inside a city24.
  6. Schedule building inspections; requirements vary by project design, materials and complexity28.
  7. Receive the certificate of occupancy before occupying a new dwelling or townhouse30.

What should you check before buying land in Marion County?

Marion County Planning publishes a fee schedule: administrative review is $770, a conditional use $1450, a variance $1565 and a floodplain or greenway permit $113069. Ask Marion County Planning to confirm the parcel’s zone, allowed dwelling, setbacks and lot-creation history before assuming acreage makes unincorporated land buildable570. Floodplain or floodway development usually needs a floodplain development permit; a new dwelling or manufactured home generally must use an available site outside the floodplain71. A landowner personally constructing, altering or abandoning a well needs a state landowner permit before work66. Covered driveway work in the public right-of-way requires a county access permit with a $50 fee; local fire districts may impose additional driveway requirements6728. The effective property-tax rate is about 0.9%, with a median annual bill of about $3,3827273.

Watch-outs

  • The 120-day RV allowance is not blanket permission for full-time RV living; vacant-lot use is limited to the AR, SA, FT and TC zones and must meet the applicable development standards16.
  • AR setbacks have exceptions for accessory and farm-exempt buildings, older small parcels and corner lots; ask Marion County Planning to confirm the buildable envelope385.
  • Rooms, apartments or sleeping facilities rented daily or weekly to travelers require annual county health licensing and semiannual inspections; zoning requirements may also apply74.
  • We could not confirm a countywide minimum dwelling size or a complete countywide lot-coverage rule; ask Marion County Planning for the standards attached to the parcel's mapped zone5.

Sources

  1. Building Inspection, quoted and re-checked
  2. Marion County Building Inspection (co.marion.or.us)
  3. Planning & Zoning, quoted and re-checked
  4. Zone Codes, Comprehensive Plan & Other Regulations, quoted and re-checked
  5. Marion County Planning Division (co.marion.or.us)
  6. Onsite Sewage Disposal Program (Septic) — Background, quoted and re-checked
  7. Onsite Sewage Disposal Program (Septic), quoted and re-checked
  8. Building Inspection (2026 county census)
  9. Planning & Zoning (2026 county census)
  10. Zone Codes, Comprehensive Plan & Other Regulations, quoted and re-checked
  11. Onsite Sewage Disposal Program (Septic) — Background, quoted and re-checked
  12. Gervais: Marion County Where to Apply for Permits (Marion County), quoted and re-checked
  13. 2023 Oregon Residential Specialty Code — Chapter 1, quoted and re-checked
  14. Structural Permit Application, quoted and re-checked
  15. Code Amendment Staff Report, quoted and re-checked
  16. co.marion.or.us, quoted and re-checked
  17. Declaratory Statement: Agricultural Building/Forestry Building/Equine Facility, quoted and re-checked
  18. Marion County Rural Zone Code, Chapter 17.136 EFU, quoted and re-checked
  19. co.marion.or.us, quoted and re-checked
  20. Accessory Dwelling Units: Regulations for accessory dwelling units in Marion County, quoted and re-checked
  21. Accessory Dwelling Units: Regulations for accessory dwelling units in Urban Marion County, quoted and re-checked
  22. Building Codes Division — About us, quoted and re-checked
  23. 2023 Oregon Residential Specialty Code, Chapter 1, quoted and re-checked
  24. Building Permit Process, quoted and re-checked
  25. St. Paul: Where to Apply for Permits (Marion County), quoted and re-checked
  26. St. Paul: Onsite Sewage Disposal Program (Septic) (Marion County), quoted and re-checked
  27. Typical Inspections for New Single Family Dwelling, quoted and re-checked
  28. Building Inspection, quoted and re-checked
  29. Contractor Information Required for Certificate of Occupancy, quoted and re-checked
  30. Contractor Information Required for Certificate of Occupancy, quoted and re-checked
  31. Keizer: Code of Ordinances: Appendix A - Development Code, § 2.110.02 Permitted uses (Marion County), quoted and re-checked
  32. Gervais: Gervais Code § 17.24.020, R-1 permitted uses (Marion County), quoted and re-checked
  33. Aurora: Aurora Code § 16.10.020, R-1 Permitted Uses (Marion County), quoted and re-checked
  34. St. Paul: official source (Marion County), quoted and re-checked
  35. Keizer: Where to Apply for Permits (Marion County), quoted and re-checked
  36. Aurora: Onsite Sewage Disposal Program (Septic) (Marion County), quoted and re-checked
  37. Chapter 17.128 AR Acreage Residential Zone, quoted and re-checked
  38. Chapter 17.128 AR Acreage Residential Zone, quoted and re-checked
  39. Chapter 17.128 AR Acreage Residential Zone, quoted and re-checked
  40. Marion County Rural Zone Code, Chapter 17.136 EFU, quoted and re-checked
  41. Marion County Rural Zone Code, Chapter 17.136 EFU, quoted and re-checked
  42. Chapter 16.02 Single-Family Residential - RS Zone, quoted and re-checked
  43. Chapter 16.03 Limited Multiple-Family Residential - RL Zone, quoted and re-checked
  44. Marion County Urban Zone Code, Chapter 16.04 RM, quoted and re-checked
  45. Chapter 16.02 Single-Family Residential - RS Zone, quoted and re-checked
  46. Chapter 16.03 Limited Multiple-Family Residential - RL Zone, quoted and re-checked
  47. Chapter 16.02 Single-Family Residential - RS Zone, quoted and re-checked
  48. Chapter 16.03 Limited Multiple-Family Residential - RL Zone, quoted and re-checked
  49. Chapter 16.04 Multiple-Family Residential - RM Zone, quoted and re-checked
  50. Marion County Urban Zone Code, Chapter 16.33 Subdivision and Partition Requirements, quoted and re-checked
  51. Housing and Onsite Wastewater Management, quoted and re-checked
  52. Housing and Onsite Wastewater Management, quoted and re-checked
  53. Application for Onsite Wastewater Treatment System — Marion County Onsite Disposal System Fee Schedule, quoted and re-checked
  54. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
  55. Chapter 17.126 Permitted Uses Generally, quoted and re-checked
  56. Chapter 17.139 Farm/Timber Zone, quoted and re-checked
  57. co.marion.or.us, quoted and re-checked
  58. Zone Codes, Comprehensive Plan and Other Regulations, quoted and re-checked
  59. Accessory Dwelling Units: Regulations for accessory dwelling units in Marion County, quoted and re-checked
  60. Accessory Dwelling Units: Regulations for accessory dwelling units in Urban Marion County, quoted and re-checked
  61. Accessory Dwelling Units: Regulations for accessory dwelling units in Marion County, quoted and re-checked
  62. Oregon Revised Statutes, ORS 446.125, quoted and re-checked
  63. Chapter 17.128 AR Acreage Residential Zone, quoted and re-checked
  64. What is a Zoning Review?, quoted and re-checked
  65. Onsite Wastewater (Septic) Rules Update, quoted and re-checked
  66. Landowner Constructed Wells, quoted and re-checked
  67. Access Permit FAQ, quoted and re-checked
  68. Marion County Public Works Land Development Engineering & Permits (co.marion.or.us)
  69. Fees — Planning Division Fees, quoted and re-checked
  70. Zone Codes, Comprehensive Plan & Other Regulations, quoted and re-checked
  71. Flood & Floodplain Protection, quoted and re-checked
  72. Effective property tax rate: Bolthole Index county data
  73. Median property tax bill: Bolthole Index county data
  74. co.marion.or.us, quoted and re-checked

Written October 14, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

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Compared with neighboring counties

Like all 6 of its neighbors, Marion County has countywide zoning.

RuleMarion CountyYamhill CountyPolk CountyClackamas CountyLinn CountyWashington CountyMultnomah County
Building permitRequiredLimitedRequiredRequiredRequiredNot requiredRequired
County zoningYesYesYesYesYesYesYes
Septic permitsCounty Building InspectionCounty Planning & DevelopmentCounty Env. HealthCounty Septic ProgramCounty Env. Health ProgramCounty Env. HealthCity of Portland Permitting & Development

County locator

Marion County in Oregon

47
County map
Marion County highlighted among the Oregon counties · colored by Index score

How Marion County scores

Seclusion21100% ev.
Self-Sufficiency5898% ev.
Admin Boringness42100% ev.
Durability57100% ev.
Property Autonomy72100% ev.
Carry Cost34100% ev.

Evidence strength: 100%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$447kTypical home
0.9%Property tax
$17,033Land / acre
64.8"Annual rain
15.3% of yrsSevere drought
1.8 / yr (+1.5)Mid-century 100°F days
27.4 daysMid-century dry spell
2.21" (+5.2%)Mid-century 1-day rain
1.27×Wildfire change factor
100%Forward climate coverage
$1,061Home insurance / yr
2.7% / yrInsurance growth
0.57%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
410,280People within 30 min
3,869,088People within 2 hr
213,507Radius comparison (15 mi)
293.6People / sq mi
32.9%Federal land
53.3%Land at 15% slope or less
7.7%Soils rated "not limited" for septic (strict USDA rating)
38,634 acWorkable land screen
53.2%Wooded land
101.7 tonsBiomass / forest ac
50.2°FAvg temp

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Cities and towns in Marion County

Inside a city or town, that city usually issues building permits and sets zoning; the county’s rules above cover unincorporated land. Septic, wells and floodplain rules usually stay with the county or state everywhere.

Not yet researched: Aumsville · Detroit · Donald · Gates · Hubbard · Mount Angel · Salem · Scotts Mills · Silverton · Stayton · Sublimity · Turner · Woodburn

Answers from the rulebook for Marion County

What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.

Marion County rules

  • Building permitRequired

    Construction, enlargement, alteration, movement, or replacement of a home or related structure in unincorporated Marion County.

    • Marion County Building Inspection reviews new construction and remodeling plans in unincorporated areas and in cities that do not have building inspection programs.
    • A permit is not required for listed minor repairs and maintenance, including certain fences, patios or decks not more than 30 inches above grade, and limited roofing, finish, and window or door work.
    • Separate plumbing, electrical, and mechanical permits may still be required for otherwise exempt work.
    • Code standards still apply when a permit is not required.

    accessory structure floor area threshold: > 200 square feet (A carport, garage, or shed of more than 200 square feet requires a permit; structures under 200 square feet may also require one if height exceeds 10 feet from finished floor to top of top plate.) · deck height threshold: > 30 inches above grade (A deck at or below 30 inches above grade is listed as permit-exempt.)

    “A permit is required to construct, enlarge, alter, move, or replace any home or related structure.”
  • Owner-builder exemptionAvailable (with conditions)

    Homeowner installations submitted through Marion County Building Inspection for residential or farm property in the unincorporated county.

    • The installation must be on residential or farm property owned by the applicant or a member of the applicant's immediate family.
    • The exemption is from contractor licensing requirements under ORS 701.010; it is not stated to waive building, electrical, plumbing, or mechanical permits.
    • A CCB form is required for homeowner permits.
    • Marion County Building Inspection reviews construction plans in unincorporated areas and also serves cities that do not have building-inspection programs; this claim is limited to the county's unincorporated jurisdiction.
    “This installation is being made on residential or farm property owned by me or a member of my immediate family, and is exempt from licensing requirements under ORS 701.010.”
  • InspectionsRequired

    New single-family dwellings in unincorporated Marion County.

    • The county's list is general only; required inspections for an individual project can vary with complexity, design, and materials.
    • Typical inspections include footing, foundation wall/rebar, damp/waterproofing where applicable, rain drains, water service, sanitary sewer, plumbing, mechanical, framing, insulation, shearwall, mechanical final, plumbing final, electrical final, and structural final.
    • The structural final occurs after all work is completed and prior to occupying the home.
    • Additional inspections may be required based on location and scope; septic work must be inspected and approved before the final plumbing or structural final when applicable.
    • The county may have additional permit and inspection requirements for projects in unincorporated Marion County or adjacent to a county road within city limits.
    • Local fire districts may have additional driveway requirements.
    “This is only a general list of typical inspections for a new single family dwelling. The required inspections for each individual project can vary depending on the complexity, design, and materials used.”
    One more reviewed finding on this topic
    • Required — New single-family dwelling construction in unincorporated Marion County.
      “This is only a general list of typical inspections for a new single family dwelling. The required inspections for each individual project can vary depending on the complexity, design, and materials used.”
  • Certificate of occupancyRequired

    A new residential dwelling or townhouse requiring a residential structural permit in Marion County's building-inspection jurisdiction.

    • The contractor-information form must be completed and submitted to Marion County Building Inspection before the residential Certificate of Occupancy will be issued.
    • The general contractor or owner issued the structural permit must provide contact and relevant license information for the general, electrical, HVAC, and plumbing contractors that performed work.
    • This claim is limited to residential Certificates of Occupancy; the cited county form does not establish requirements for every commercial occupancy.
    “Prior to occupancy of a new residential dwelling or townhouse the building official must issue a certificate of occupancy in the form and format established by the Division, unless a temporary certificate of occupancy is issued by the building official.”
    One more reviewed finding on this topic
    • Required — A new residential dwelling or townhouse requiring a structural permit in unincorporated Marion County.
      “Prior to occupancy of a new residential dwelling or townhouse the building official must issue a certificate of occupancy in the form and format established by the Division, unless a temporary certificate of occupancy is issued by the building official.”
  • County-wide zoningPresent (with conditions)

    Zoning and land-use regulation in Marion County's unincorporated areas.

    • The Marion County Planning Division implements land-use regulations for all unincorporated areas of the county.
    • Marion County's Rural Zone Code divides the county into use zones shown on the official zoning map.
    • Before issuing permits or granting land-use approval, county officials must determine that the proposed use or construction conforms to the zoning code.
    • No permit or land-use approval may be issued when the land is used in violation of an approval condition, local, state, or federal law, or the ordinance, unless issuance would correct the violation.
    “The Planning Division is responsible for administering the Marion County Comprehensive Plan and implementing land use regulations for all unincorporated areas of the county.”
    One more reviewed finding on this topic
    • Present (with conditions) — Marion County zoning regulations for development and use of land outside urban growth boundaries and in unincorporated areas within urban growth boundaries.
      “Title 17 Rural Zoning of the MCC provides regulations for development and use of lands in the portions of Marion County outside urban growth boundaries. The primary intent of these regulations is to conserve farm and forest lands for the production of crops, livestock, and timber products. The Rural Zone Code contains chapters covering each rural zone type (Exclusive Farm Use, Acreage Residential, Farm/Timber, etc.). These chapters also include uses allowed, development restrictions, and specific topics such as signs, floodplain regulations, etc. Title 16 Urban Zoning of the MCC provides regulations for development and use of lands in unincorporated areas of Marion County within urban growth boundaries.”
  • Local zoningVaries (with conditions)

    Local zoning review across Marion County, with the applicable authority depending on whether the property is under Marion County or a city jurisdiction; this is an aggregate countywide conclusion and does not mean the county administers each municipal ordinance.

    • For a permit application submitted to Marion County, the site plan is reviewed by either the Marion County Planning Division or the city jurisdiction.
    • The review identifies the property's zone and checks consistency with zone-code requirements.
    • The review determines required setbacks, reviews land-use requirements, imposes conditions of land-use approvals, reviews street-name validity as a county street, and assigns or coordinates the address with the city jurisdiction if the property is within an urban growth boundary.
    • If a conflict with the zone code is found, the applicant is referred to the Marion County Planning Division or the appropriate city for further information.
    “Zoning Review: The site plan is reviewed by either Marion County Planning Division or the city jurisdiction.”
    2 more reviewed findings on this topic
    • Varies (with conditions) — Aggregate local zoning across Marion County; the county administers Title 17 in portions outside urban growth boundaries and Title 16 in unincorporated areas within urban growth boundaries.
      “Title 16 Urban Zoning of the MCC provides regulations for development and use of lands in unincorporated areas of Marion County within urban growth boundaries.”
    • Varies (with conditions) — Local zoning administration across Marion County, aggregating county zoning in unincorporated areas and city-jurisdiction zoning where applicable.
      “Zoning Review: The site plan is reviewed by either Marion County Planning Division or the city jurisdiction. This review will identify the property's zone and that the proposal is consistent with zone code requirements:”
  • Zoning districtsPublished (with conditions)

    Marion County zoning districts and overlays in unincorporated areas, with Title 17 applying outside urban growth boundaries and Title 16 applying within urban growth boundaries.

    • Title 17 Rural Zoning applies to portions of Marion County outside urban growth boundaries.
    • Title 16 Urban Zoning applies to unincorporated areas within urban growth boundaries.
    • The county page states that the code chapters include uses allowed, development restrictions, and other specific topics.
    • The published rural and urban district labels are acronyms; the source lists them as zone-code districts and overlays.
    “Title 16 Urban Zoning of the MCC provides regulations for development and use of lands in unincorporated areas of Marion County within urban growth boundaries.”
  • Minimum lot sizeSpecified

    Residential lots and multiple-family dwelling lots in unincorporated Marion County RL zones.

    • Planned developments under MCC 16.26.800 may follow different standards.
    • Lot dimensions are at least 40 feet wide and 70 feet deep.

    unattached single-family dwelling lot area: >= 4000 square feet (Except as provided for planned developments.) · single-family dwelling attached on one side lot area: >= 3500 square feet (Except as provided for planned developments.) · single-family dwelling attached on both sides lot area: >= 3000 square feet (Except as provided for planned developments.) · duplex lot area: >= 6000 square feet (Except as provided for planned developments.) · multiple-family dwelling lot area: >= 6000 square feet (See Chapter 16.27 density limitations.)

    “The lot area for an unattached single-family dwelling, shall be at least 4,000 square feet. The lot area for a single-family dwelling attached on one side is 3500 square feet, and for a single-family dwelling attached on both sides the lot area shall be at least 3000 square feet. Duplexes shall occupy lots of at least 6,000 square feet.”
    4 more reviewed findings on this topic
    • Specified — New farm parcels created through land division in Marion County's Exclusive Farm Use (EFU) zone.
      “The acreage size calculated in subsection (A)(1)(b) of this subsection, rounded to the nearest 10 acres, is the minimum parcel size unless such parcel size is less than 80 acres, in which case the minimum parcel size is 80 acres.”
    • Specified — Multiple-family dwellings and other uses in the unincorporated Marion County RM zone within an urban growth boundary.
      “A. Lot Area, multiple family dwellings and other uses: At least 6,000 square feet. B. Lot Dimensions: The width of a lot shall be at least 40 feet, and the depth of a lot shall be at least 70 feet except as provided in MCC 16.26.800 for planned developments.”
    • Specified — Subdivisions, partitions, and planned developments in unincorporated Marion County AR (Acreage Residential) zones.
      “The minimum lot size for subdivisions and partitioning is two acres. When a numerical suffix has been applied to the AR zone, the minimum lot size shall conform to the numerical designation. The minimum lot size shall also apply to planned developments.”
    • Specified — Single-family dwelling lots in unincorporated Marion County RS zones within and outside the Salem/Keizer urban growth boundary.
      “The minimum lot area for a single family dwelling in a subdivision approved after the effective date of the ordinance codified in this title is 4,000 square feet when located within the Salem/Keizer area urban growth boundary. In all other cases lots shall be a minimum of 6,000 square feet.”
  • SetbacksSpecified

    New structures and dwellings in unincorporated Marion County RS zones within urban growth boundaries.

    • Salem/Keizer UGB front yard is 12 feet, with 20 feet for street-facing garages or carports.
    • Other UGBs require a 20-foot front yard.
    • Arterial or collector streets require 20 feet or the applicable special setback, whichever is greater.
    • Accessory structures, planned developments, and mobile home parks have separate standards.
    • Interior side yards are generally five feet, subject to zero-side-yard conditions.
    • Rear yards differ between Salem/Keizer UGB and other UGBs.

    Salem/Keizer UGB front yard: 12 feet (Street-facing garage or carport requires 20 feet.) · other UGB front yard: 20 feet · side yard: >= 5 feet (Zero-side-yard dwelling rules may apply inside Salem/Keizer UGB.) · Salem/Keizer UGB rear yard for qualifying dwelling/building: 14 feet (20 feet for a primary building portion over 15 feet high.) · other UGB rear yard: >= 20 feet

    “Within the Salem/Keizer urban growth boundary 14 feet for any single family dwelling and for a primary building that does not exceed 15 feet in height. A primary building greater than 15 feet in height shall maintain a 20 foot rear yard. Within other urban growth boundaries 20 feet for a single family dwelling and for any portion of a building other than a single family dwelling.”
    3 more reviewed findings on this topic
    • Specified — New structures in Marion County's EFU zone, excluding farm-exempt buildings, signs, and fences.
      “B. Minimum Setbacks: Except as required in MCC 17.136.070(A), the following setback requirements shall be implemented for all new structures other than farm-exempt buildings, signs and fences: 1. Rear Yard. A minimum of 20 feet. 2. Side Yard. A minimum of 20 feet, except for lots or parcels of one-half acre or smaller created prior to January 1, 1994, in which case the side yard setback shall be five feet. 3. Front Yard. A minimum of 20 feet.”
    • Specified — New structures in unincorporated Marion County AR zones.
      “1. Rear Yard. A minimum of 20 feet. 2. Side Yard. A minimum of 10 feet, except for lots or parcels of one-half acre or smaller created prior to January 1, 1994, in which case the side yard setback shall be five feet. In the case of a corner lot any side yard adjacent to a street shall be not less than 20 feet. 3. Front Yard. A minimum of 20 feet.”
    • Specified — New structures in unincorporated Marion County RL zones.
      “Five feet, except 20 feet for any portion of a building greater than 15 feet in height, other than a single-family dwelling, when the rear lot line abuts an RS zone.”
  • Building heightSpecified

    Structures in unincorporated Marion County AR zones.

    • Dwellings are limited to 35 feet.
    • Farm-related structures on farm parcels have no stated maximum in this section.
    • Nonresidential and non-farm structures may exceed 35 feet only when associated with a conditional use and approved through the conditional-use permit.

    dwelling maximum height: <= 35 feet · farm-related structure maximum height: none · nonresidential/non-farm structure maximum height: <= 35 feet (Greater height may be requested and approved with a conditional-use permit.)

    “1. Dwellings: 35 feet. 2. Farm related structures on farm parcels: none. 3. Non-residential and non-farm structures: 35 feet unless they are in conjunction with conditional uses allowed in MCC 17.128.030, and a greater height is requested and approved as part of the conditional use permit.”
    4 more reviewed findings on this topic
    • Specified — Dwellings and non-residential/non-farm structures in Marion County's EFU zone.
      “A. Maximum Height: 1. Dwellings: 35 feet. 2. Farm related structures on farm parcels: none. 3. Non-residential and non-farm structures: 35 feet unless they are in conjunction with conditional uses allowed in MCC 17.136.050, and a greater height is requested and approved as part of the conditional use permit.”
    • Specified — Structures in unincorporated Marion County RS zones within urban growth boundaries.
      “Structures shall not exceed 35 feet in height except as provided for in subsections (B) and (C) of this section. B. Structures for public and semi-public* uses: 70 feet provided required setbacks shall be increased one foot for every foot the structure height exceeds 35 feet.”
    • Specified — Structures in unincorporated Marion County RL zones.
      “Structures shall not exceed 35 feet in height except as provided for in subsection (B) and (C) of this section. B. Structures for public and semi-public* uses: 70 feet provided required setbacks shall be increased one foot for every foot the structure height exceeds 35 feet.”
    • Specified — Structures in unincorporated Marion County RM zones.
      “Structures shall not exceed 35 feet in height except as provided for in subsection B) and C) of this section. B. Structures for public and semi-public* uses: 70 feet provided required setbacks shall be increased one foot for every foot the structure height exceeds 35 feet.”
  • Living in an RVLimited

    One recreational-vehicle space on a lot or parcel without a dwelling in Marion County's AR, SA, FT, and TC zones.

    • The exception in MCC 17.178.050(F) applies.
    • The space must comply with MCC 17.126.040, except subsections (B) and (C).
    • The space may not be occupied for more than 120 days in any calendar year.
    • The space must satisfy all development standards and requirements applied to a non-resource-related dwelling in the applicable zone.

    maximum occupancy: <= 120 days per calendar year

    “C. Except as provided for in MCC 17.178.050 (F), one recreational vehicle space on a lot or parcel without a dwelling in the AR, SA, FT and TC zones subject to the requirements in MCC 17.126.040, except subsections (B) and (C). In addition, the space shall: 1. Not be occupied for more than 120 days in any calendar year; and 2. Satisfy all development standards and requirements applied to a non-resource-related dwelling in the applicable zone.”
    2 more reviewed findings on this topic
    • Limited — Occupancy of a recreational vehicle on an unincorporated Marion County property with a dwelling.
      “occupancy of a recreational vehicle on a property with a dwelling up to 120 days in a calendar year.”
    • Limited — One recreational vehicle space on a lot with a permitted dwelling or mobile home in rural unincorporated Marion County.
      “One recreational vehicle space subject to the requirements in MCC 17.126.040;”
  • Camping on your landLimited

    Private campgrounds in the Marion County Farm/Timber (FT) zone under MCC 17.139.040(F).

    • Except on a lot or parcel contiguous to a lake or reservoir, private campgrounds may not be within three miles of an urban growth boundary unless an exception is approved under ORS 197.732 and OAR chapter 660, division 004.
    • The use must be for overnight temporary vacation, recreational, or emergency purposes, not residential purposes, and must be on or contiguous to lands with a park or other outdoor natural amenity accessible to occupants.
    • Camping sites may only be occupied by a tent, travel trailer, or recreational vehicle.
    • Separate sewer, water, or electric service hookups may not be provided to individual campsites.
    • Overnight temporary use by a camper or camper's vehicle may not exceed 30 days during any consecutive six-month period.

    maximum overnight use: <= 30 days per consecutive six-month period

    “F. Private Parks, playgrounds and campgrounds shall meet the following criteria:”
    One more reviewed finding on this topic
    • Limited — Overnight temporary camping in a Marion County recreation park.
      “Marion County Environmental Health licenses recreation parks and inspects them semi-annually to verify compliance with Oregon Administrative Rules, Chapter 333 - Division 031.”
  • Tiny homesProhibited

    A tiny house on wheels used as a permanent living space or dwelling in the urban or rural unincorporated areas of Marion County.

    • The source states that the only exception for structures on wheels is temporary use of an RV for a medical hardship; it does not identify a tiny-house exception.
    • If the property is inside an incorporated city, the city’s zoning and land-use rules apply instead.
    “Generally, any structure on wheels cannot be used as a permanent dwelling in the urban or rural areas.”
    2 more reviewed findings on this topic
  • Manufactured homesAllowed (with conditions)

    Replacement of a lawfully established dwelling in the rural Acreage Residential zone when the existing dwelling is a manufactured dwelling, mobile home, or manufactured home.

    • The replacement is subject to the special siting standards in MCC 17.128.050(B).
    • The replaced manufactured dwelling, mobile home, or manufactured home must be removed or demolished within 90 days after occupancy of the replacement dwelling.
    • Other applicable zoning, building, septic, floodplain, and overlay requirements may apply.

    removal or demolition deadline: <= 90 days after occupancy of replacement dwelling

    “the replaced dwelling shall be removed or demolished within 90 days of the occupancy of the replacement dwelling.”
    2 more reviewed findings on this topic
    • Limited — A manufactured home used as an accessory dwelling unit in Marion County urban growth-boundary areas outside city limits.
      “A manufactured home is allowed as an ADU provided it meets the ADU standards and must be Energy Star certified and exhibit the US Housing and Urban Development (HUD) certification label pursuant to OAR 918-500-0450.”
    • Allowed (with conditions) — A manufactured home used as an accessory dwelling unit in Marion County.
      “A manufactured home is allowed as an ADU provided it meets the ADU standards and must be Energy Star certified and exhibit the US Housing and Urban Development (HUD) certification label pursuant to OAR 918-500-0450.”
  • Accessory dwellingsAllowed (with conditions)

    Accessory dwelling units in unincorporated Marion County urban-growth-boundary areas.

    • Allowed in the Urban Transition zone only as interior or attached ADUs, and in Single Family Residential and Urban Development zones as interior, attached, or detached ADUs.
    • The ADU must meet the applicable MCC 16.26.100 standards.
    • Only one ADU is allowed per parcel.
    • If rented, the ADU must be rented for at least 30 days.
    • A Marion County Building Inspection building permit is required; no land-use application is required.
    • A manufactured home may be used as an ADU only if it meets the ADU standards, is Energy Star certified, and displays the HUD certification label under OAR 918-500-0450.
    • Recreational vehicles, park models, and tiny houses on wheels may not be used as ADUs.

    minimum rental duration: >= 30 days (If rented.) · maximum ADUs: 1 per parcel

    “Urban Transition Zone - allows interior or attached only, subject to standards in MCC 16.26.100.”
    One more reviewed finding on this topic
    • Allowed (with conditions) — Accessory dwelling units in Marion County urban growth boundary areas outside city limits.
      “On December 20, 2017, the Marion County Board of Commissioners adopted Ordinance #1382, allowing accessory dwelling units (ADUs) in urban growth boundary areas of Marion County, outside city limits. This ordinance amended Marion County Urban Zone Code Chapter 16.26.”
  • Who permits septicMixed

    Onsite septic permitting and administration within Marion County, including properties not served by community sewer.

    • Marion County Building Inspection acts as a contract agent of the Oregon Department of Environmental Quality (DEQ).
    • Septic permits are issued under DEQ onsite sewage disposal rules.
    • Properties served by a community sewer system and systems reserved by DEQ under Water Pollution Control Facilities rules are exceptions.
    “Building Inspection is a contract agent of the Oregon Department of Environmental Quality (DEQ).”
  • Septic permitRequired

    Septic systems in Marion County, including new installations, repairs, alterations, and connections to existing systems.

    • Marion County issues septic permits within the county as a DEQ contract agent.
    • Properties served by a community sewer system are excepted.
    • Systems reserved by DEQ under WPCF rules are excepted.
    • For systems over 2,500 gallons per day, the county page directs applicants to Oregon DEQ for permitting requirements.
    • A site evaluation is required for an undeveloped site that has never been evaluated for septic approval; a construction-installation permit follows an approved site evaluation for a new installation.
    • A septic permit is not required for plumbing in an accessory structure when gravity flow to the existing septic tank is attainable, although plumbing permit requirements must still be checked.

    large-system threshold: > 2500 gallons per day (Direct DEQ permitting requirements apply.)

    “issues all septic system permits within Marion County.”
  • Septic inspectionLimited

    Installation and related authorization of onsite sewage systems for properties within Marion County that are not served by a community sewer system.

    • Marion County's onsite sewage program inspects system installations for properties not served by a community sewer system.
    • For systems over 2,500 gallons per day, applicants must contact Oregon DEQ for permitting requirements; these systems are an exception to the ordinary county process.
    • Marion County states that field visits are required when a system is more than 5 years old or when there is no record of installation.
    • Properties served by a community sewer system are excluded.
    • Systems reserved by DEQ under Water Pollution Control Facilities rules are excluded.

    system flow threshold: > 2500 gallons per day (Contact Oregon DEQ for permitting requirements.) · field visit trigger: > 5 years (A field visit is also required if there is no record of installation.)

    “The onsite sewage disposal program determines sewage treatment, disposal feasibility and inspects the installation of systems for properties located within Marion County that are not served by a community sewer system.”
  • Agricultural exemptionAvailable (with conditions)

    Agricultural buildings, forestry buildings, and equine facilities in Marion County that qualify under ORS 455.315 and receive county agricultural-exemption approval.

    • The structure must be used solely as an agricultural building, forestry building, or equine facility as defined by ORS 455.315.
    • The structure may not be used as a dwelling.
    • All current owners must be listed and sign the statement before a notary.
    • The statement must be returned to the Planning Division for review and then recorded with the Marion County Clerk; a recording fee applies.
    • Pending building permits will not be issued until the Planning Division receives the recorded document or official recording information.
    • In farm zones, or land devoted to farm use in a mixed farm/forest zone, no change in use may occur without necessary land-use approval and building permits.
    • In forest zones, or land devoted to forest use in a mixed farm/forest zone, an agricultural building authorized under ORS 455.315 may not be converted to another use.
    • The exemption does not cover dwellings, certain structures with 10 or more persons, State Fire Marshal-regulated structures, structures used by the public, or structures subject to the National Flood Insurance Act provisions.
    “A Declaratory Statement is required when the County approves an application exempting an agricultural building or equine facility from the structural specialty code. Documents will not be accepted until complete and accurate.”
  • Subdividing landRegulated (with conditions)

    Subdivision and partitioning of land within Marion County urban growth boundaries under Title 16.

    • The chapter establishes minimum requirements for public health, safety, welfare, streets, utilities, drainage systems, and public areas.
    • Applications must conform to applicable county regulations and state statutes and planning goals.
    • Final plat approval, recordation, and other application requirements apply under the chapter.
    • Rural areas outside urban growth boundaries are regulated under Title 17 and applicable rural-zone provisions.
    “To regulate the subdividing and partitioning of land within urban growth boundaries in Marion County in accord with applicable state statutes and the State Planning Goals.”
  • Driveway accessRequired

    New, rebuilt, widened, improved, or changed-use driveway access/sidewalks, including access to Marion County-maintained roads and certain public rights-of-way.

    • A permit may also be required when applying for a building permit or planning action, when the county finds access significantly unsafe, or after an access review fails.
    • The permit process includes an application, site plan sketch, $50 fee, field marking, inspection, county standards, and final inspection.
    • For curbed streets, inspection must be requested before concrete pouring with a minimum 24-hour response period.
    • The requirements apply only to the portion within the public right-of-way, from the property line to the road.

    driveway access permit fee: 50 USD (Curbed and non-curbed streets) · maximum residential access width: 24 feet · maximum commercial access width: 40 feet (Based on need)

    “In accordance with Marion County Ordinance #651, you need a driveway access permit if you are: Creating a new driveway access/sidewalk. Rebuilding, widening, or improving an existing driveway access/sidewalk. Changing the use of an existing driveway access (i.e. farm to residential use, residential to commercial use, farm to commercial use).”
  • Building in a floodplainLimited

    Development in floodplain and floodway areas regulated by Marion County in unincorporated areas, including rural areas and property outside city limits within urban growth boundaries.

    • Development in a floodplain or floodway usually requires review and approval of a Floodplain Development Permit.
    • For property outside any urban growth boundary, the rural floodplain rules are in MCC Chapter 17.178; for property outside city limits but within an urban growth boundary, the urban floodplain rules are in MCC Chapter 16.19.
    • New dwellings and manufactured homes are prohibited in the floodplain when an area on the subject property outside the floodplain is available for placement; an exception may be granted with a floodplain development permit and qualifying variance.
    • Mining, dredging, filling, grading, paving, or excavation within the 500-year floodplain requires a floodplain development permit.
    • New critical facilities are prohibited within the floodway and 100- and 500-year floodplains, except that an exception may be granted for development in the 500-year floodplain with a floodplain development permit and qualifying variance; the prohibition does not apply to water-dependent uses.
    • Before a building permit, the owner must record a declaratory statement acknowledging the property and approved development are in a floodplain; certifications and elevation certificates may also be required.
    • Floodway placement may not cause any rise in base flood elevation.

    floodplain annual flood probability threshold: >= 1 percent or greater chance in any given year · 500-year floodplain excavation/development permit: true (Applies to mining, dredging, filling, grading, paving, or excavation.)

    “Except as provided herein all uses and floodplain development shall be subject to issuance of a conditional use permit (floodplain development permit)”
  • Short-term rentalsLimited

    Traveler accommodations in Marion County consisting of rooms, apartments, or sleeping facilities rented daily or weekly to travelers or transients for a charge.

    • Marion County Environmental Health licenses traveler accommodations annually.
    • Marion County Environmental Health inspects traveler accommodations semi-annually.
    • The source identifies Oregon Administrative Rules, Chapter 333, Division 029 as the applicable compliance rules.
    • This claim addresses county health licensing; underlying land-use and zoning requirements may also apply.

    license frequency: annually · inspection frequency: semi-annually

    “Marion County Environmental Health licenses travelers' accommodations annually and inspects them semi-annually to verify compliance with Oregon Administrative Rules, Chapter 333 - Division 029.”
  • Permit feesPublished

    Marion County onsite wastewater permits, site evaluations, repairs, alterations, reviews, inspections, and related onsite activities for properties within Marion County not served by a community sewer system.

    • The fee schedule states that new fees begin July 1, 2025.
    • Fees include Marion County fees and, where shown, a $117.00 DEQ surcharge; total fees include the surcharge where applicable.
    • Single Family Dwelling site evaluation is $912.25 for the first lot plus a $117.00 DEQ surcharge, totaling $1029.25; each additional lot evaluated during the initial visit is $840.50 plus the surcharge, totaling $957.50.
    • Construction installation permit fees vary by system type, including Standard System at $1107.00 plus surcharge, Alternate Treatment Technologies at $1588.75 plus surcharge, Sand Filter at $1845.00 plus surcharge, and Holding Tank at $840.50 plus surcharge.
    • Commercial plan review is $379.25 for 601-1000 gallons per day and $71.75 for each 500 gallons per day above 1000.
    • Compliance Recovery Fee for work done without permits, when authorized by OAR 340-071-0140, equals the application fee and is variable.
    • The county onsite program page states that it serves properties within Marion County not served by a community sewer system; systems over 2500 gallons per day should contact Oregon DEQ for permitting requirements.

    fee schedule effective date: 2025-07-01 (New fees beginning July 1st, 2025.) · single family dwelling site evaluation, first lot total: 1029.25 USD (Includes $117.00 DEQ surcharge.) · standard construction installation permit total: 1224 USD (Includes $117.00 DEQ surcharge.) · minor repair permit total: 465.5 USD (Includes $117.00 DEQ surcharge.) · commercial plan review, 601-1000 gallons per day: 379.25 USD · compliance recovery fee: Varies USD (For work done without permits when authorized by OAR 340-071-0140; equal to application fee.)

    “New Fees Beginning July 1st, 2025 [...] Standard System, Redundant System, Saprolite, Seepage Pit, Steep Slope $ 1,107.00 $ 117.00 $ 1,224.00”
    One more reviewed finding on this topic
    • Published — Marion County Planning application, permit, appeal, determination, and related land-use fees administered for county planning matters in unincorporated Marion County.
      “Administrative Review - $770 [...] Adjustment - $600 [...] Conditional Use - $1450 [...] Floodplain/Greenway Permit - $1130”
  • Permit processPublished (with conditions)

    Residential building permit process for properties in Marion County, with county administration for unincorporated areas and county plan review for city-submitted plans.

    • The process document says that if the property is within a city, the applicant should apply at the local city hall.
    • For properties in an unincorporated area, Marion County accepts the permit directly at Public Works, 5155 Silverton Road NE, Salem.
    • For city properties, the city reviews plans first and sends them to the county; the county review is stated as within 10 days of receiving the plans from the city.
    • After approval, construction can start and inspections are required; a final inspection precedes issuance of a Certificate of Final Occupancy.
    • The process document is marked Revised 5/24/2021, which is a revision stamp and not treated as an effective date.

    county plan review time after receipt from city: 10 days (Applies to plans sent to the county by a city.)

    “For properties in an unincorporated area, we can take in your permit directly at Public Works, 5155 Silverton Road NE, Salem.”

Oregon rules that apply here

  • Building code adoptedAdopted (with conditions)

    Commercial construction, reconstruction, alteration, and repair governed by the Oregon Structural Specialty Code statewide.

    • The 2025 Oregon Structural Specialty Code is based on the 2024 International Building Code, International Fire Code, and International Existing Building Code.
    • Administrative provisions are effective and mandatory October 1, 2025.
    • Construction provisions were effective October 1, 2025 with a six-month phase-in period and became mandatory April 1, 2026.
    • During the phase-in period, use of either the 2022 OSSC or 2025 OSSC was permitted.

    administrative provisions effective and mandatory: 2025-10-01 · construction provisions effective: 2025-10-01 (six-month phase-in period) · construction provisions mandatory: 2026-04-01

    “Construction provisions: [...] Mandatory April 1, 2026”
    3 more reviewed findings on this topic
    • Adopted (with conditions) — Newly constructed residential and commercial buildings in Marion County under Oregon's statewide building-code system.
      “The Building Codes Division administers Oregon's Statewide Building Code, which provides uniform standards that ensure newly constructed residential and commercial buildings are safe for citizens to occupy.”
    • Adopted (with conditions) — Oregon State Building Code specialty codes administered statewide by the Oregon Building Codes Division.
      “The Building Codes Division adopts, amends, and interprets specialty codes that make up the Oregon State Building Code.”
    • Adopted (with conditions) — Construction, reconstruction, and repair of one- and two-family dwellings and townhouses governed by the Oregon Residential Specialty Code statewide.
      “2023 Oregon Residential Specialty Code (ORSC) [...] Based on 2021 International Residential Code (IRC)”
  • Minimum dwelling sizeSpecified

    An owner-built single-family residence and adjacent auxiliary structures constructed entirely by the owner intending to occupy them, or by the owner with unpaid assistance from friends and relatives.

    • The owner must not have taken advantage of the ORS 455.320(2) exemptions during the five years prior to applying for the exemption.
    • The exemption applies to structural-code requirements for ceiling heights, room sizes, and maintenance of specific temperature levels.
    • The exemption applies to new construction, renovation, remodeling, or alteration of an owner-built dwelling or outbuilding.
    • The building permit must note whether the structure complies with the exempted requirements; if it does not, the owner-builder must file a copy of the permit with the county clerk for the permanent deed record.
    • The owner must provide the county clerk a property description sufficient to give constructive notice as if contained in a mortgage.
    • The exemption does not eliminate other applicable building-code, permit, inspection, land-use, or utility requirements.

    eligibility lookback: 5 years (The five years prior to applying for an exemption under ORS 455.320.) · covered structural provisions: ceiling heights, room sizes, and maintenance of specific temperature levels

    “Owner-built dwellings and outbuildings shall be exempt from any requirements of the structural code for ceiling heights, room sizes and the maintenance of specific temperature levels in those structures. The exemption shall apply to the new construction, renovation, remodeling or alteration of an owner-built dwelling or outbuilding.”
  • Off-grid sanitationLimited

    Use of composting toilets and related graywater systems in Oregon.

    • A composting toilet does not eliminate all household water; plumbing fixtures still need connection to an approved septic system.
    • If used with a graywater reuse system, both the graywater reuse system and septic system require a DEQ permit.
    • The graywater reuse system must be offline during wet-weather months or when discharges could create a public nuisance.
    • Material removed from a composting toilet must be buried under 12 inches of soil.
    • Buildings within a sewer district still need a sewer connection.

    burial depth for removed composting-toilet material: 12 inches · maximum reduced drainfield capacity mentioned by DEQ: two-thirds (The source says the drainfield may be approved for a smaller capacity, as much as two-thirds the size.)

    “Composting toilets don't eliminate all water generated in a home and therefore you will need to be hooked up to an approved wastewater treatment system.”
    One more reviewed finding on this topic
    • Allowed (with conditions) — Onsite wastewater treatment or septic systems used for sanitary disposal where a municipal sewer system is not available, including applicable properties in Marion County.
      “development must use onsite wastewater treatment systems, or septic systems, for sanitary disposal.”
  • Well permitRequired

    A property owner constructing, altering, converting, or abandoning a water-supply well in Oregon without being a licensed and bonded Water Supply Well Constructor.

    • A licensed and bonded Water Supply Well Constructor is exempt from the landowner-permit requirement stated on the page.
    • The permit, permit fee, and bond or irrevocable letter of credit must be obtained before work begins.
    • The application requires owner and surety information, proposed well location, proposed use, type of work, and a Department-approved well design plan.
    • The bond or irrevocable letter of credit is $10,000 and the permit fee is $550.
    • Only the owner of record, an immediate family member of the owner of record, or a full-time employee whose main duties are other than well construction may operate a drilling machine under a landowner permit.
    • The permit expires six months after issuance; a water-well report is due within 30 days after permit expiration or well completion, whichever occurs first.
    • The Department may deny a permit if the proposed work presents a health threat, health hazard, contamination source, or groundwater waste source.

    bond or irrevocable letter of credit: 10000 USD · permit fee: 550 USD · permit expiration: 6 months · water-well report deadline: 30 days (after permit expiration or well completion, whichever occurs first)

    “The Water Resources Commission requires a permit [...] for each water supply well constructed, altered, converted, or abandoned by a landowner”
    One more reviewed finding on this topic
    • Required — Water-supply wells constructed, altered, converted, or abandoned by a landowner in Oregon, including Marion County.
      “The landowner permit and bond shall be obtained prior to beginning work on a well.”
  • Mandatory utility hookupConditional

    Septic permit applicants in Oregon, including Marion County, where a property is within a city limit, urban growth boundary, sanitary district, or equivalent.

    • A written statement from the municipality with sewer authority is required with the septic permit application in the specified areas.
    • Emergency repairs are not allowed in those areas unless the sewer authority provides in writing that sewer is not available.
    • Sewer availability depends on whether the property is in an area intended for urbanization, whether connection is legally accessible, whether the municipality finds connection physically practical and legally available under local ordinances, and whether the sewer system has capacity.
    • If local ordinances do not establish a physical distance, Oregon administrative rules provide default distance requirements.
    • For repair or alteration permits involving existing development and projected daily sewage flow up to 899 gallons per day, the nearest sewer connection point must be within 200 feet.
    • For construction-installation permits, the nearest sewer connection point must be within 300 feet.

    repair or alteration sewer-distance threshold: <= 200 feet (Existing development and projected daily sewage flow up to 899 gallons per day.) · construction-installation sewer-distance threshold: <= 300 feet (Nearest sewer connection point.) · projected daily sewage flow threshold: <= 899 gallons per day (Applies to the repair or alteration distance rule.)

    “A written statement from the municipality with sewer authority is required with a septic permit application”
    One more reviewed finding on this topic
    • Sewer (with conditions) — A building located within an Oregon sewer district, including a building using a composting toilet.
      “What if my building is within a sewer district? Your building will still need a sewer connection.”
  • county zoning authorityGeneral

    Oregon counties adopting and revising comprehensive plans, zoning, subdivision, and other land-use ordinances applicable to county land, including unincorporated areas.

    • The statutory text states an exception for ORS 527.722.
    • Plans and related ordinances may be adopted and revised part by part or by geographic area.
    • Zoning, subdivision, and other ordinances or regulations must be designed to implement the adopted county comprehensive plan.
    • Before a county zoning ordinance has legal effect, the governing body or planning commission must conduct one or more public hearings and publish 10 days' advance public notice; additional notice requirements apply to certain zone changes under ORS 215.223.
    “Except as provided in ORS 527.722, the county governing body shall adopt and may from time to time revise a comprehensive plan and zoning, subdivision and other ordinances applicable to all of the land in the county. The plan and related ordinances may be adopted and revised part by part or by geographic area.”
  • county building authorityGeneral

    Oregon counties administering and enforcing building inspection programs, including issuance and enforcement of building permits for residential construction in areas outside incorporated cities.

    • A county building inspection program is subject to the state building code and the statutory building-inspection-program framework.
    • If a county does not notify the director, or notifies the director that it will not administer and enforce a building inspection program, the director must arrange administration and enforcement through a municipality, other person, state employees, or state agencies; permit and other fees arising therefrom are paid into the Consumer and Business Services Fund.
    • A building inspection program is administered for four-year periods under ORS 455.150; the governing body must provide required notices to the Director of the Department of Consumer and Business Services.
    • The program must specify cooperation with the State Fire Marshal or designee and how a uniform fire code will be considered in design and construction review.
    • The cited archive is the 2015 Oregon Revised Statutes edition; the current official ORS 455 page was identified but returned a 403 error during retrieval.
    “If a city does not notify the director, or notifies the director that it will not administer the building inspection program, the county or counties in which the city is located shall administer and enforce the county program within the city in the same manner as the program is administered and enforced outside the city, except as provided by subsection (6) of this section.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission — ask the county directly.

  • Lot coverage — Lot coverage in unincorporated Marion County AR, RS, RA, RL, and RM zones.

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Water rights & wells in Marion County

Whether a new home can legally get its own water here — the sub-state groundwater regime, from Oregon’s water agency.

Closed to new supply

New water supply here generally requires a permit, an offset, or buying an existing right — a household well is not automatic.

Household wellExempt — no permit or water right

Single or group domestic groundwater use up to 15,000 gpd is exempt from permitting, but the exemption can be limited inside designated Critical Groundwater Areas.

Limit: 15,000 gpd domestic (plus stockwater and ≤0.5 acre lawn/garden) under ORS 537.545

Oregon Water Resources Department — Exempt Water Uses ↗

Prior-appropriation state (first in time, first in right). Groundwater rules change and basin boundaries follow the aquifer, not the county line — confirm current well and appropriation rules with the Oregon state water agency before you buy or drill.Groundwater governance as of Jul 2026, cited to each administering agency.

Living off-grid in Marion County, Oregon

Is Marion County a good place to live off-grid or homestead?

Marion County scores 47/100 on the Bolthole Index, a solid county profile. Its strengths: a stronger property-autonomy legal backdrop. Watch-outs: about 410,280 people within a 30-minute drive and higher long-term carry cost.

Do you need a building permit in Marion County, Oregon?

Marion County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Marion County Building Inspection - Onsite Sewage Disposal Program (contract agent of Oregon DEQ). Owner-builders may act as their own contractor to build their home. These answers are quoted from official sources and independently re-checked. Rules change and cities within the county differ — always confirm with the county before you buy or build.

Can you live in an RV or tiny home on your land in Marion County?

Living in an RV on your own land in Marion County is limited to specific cases: One recreational-vehicle space on a lot or parcel without a dwelling in Marion County's AR, SA, FT, and TC zones. The exception in MCC 17.178.050(F) applies. The space must comply with MCC 17.126.040, except subsections (B) and (C). A tiny home is prohibited. Confirm with the county before relying on it.

How much does land cost in Marion County, Oregon?

Land in Marion County runs about $17,033 per acre, based on the latest county data.

What is the water situation in Marion County?

Marion County gets about 64.8" of rain a year, with severe drought in roughly 15.3% of years. On water rights, Marion County lies in the Aquifers Withdrawn from Appropriation (Mosier; Silverton) — Commission orders withdraw specific aquifers near Mosier and Silverton from further appropriation; closed to new groundwater rights..

How remote is Marion County?

A representative private-land location has about 410,280 people within a 30-minute drive and 3,869,088 within two hours. The road-network catchments count population across county lines and clusters of smaller cities; straight-line radius values remain available as a comparison.

How Marion compares in Oregon

Compare side-by-side →See all 36 Oregon counties ranked →