Clatsop County, OR: Owner-Builder Allowed

Unincorporated Clatsop County, Oregon requires building permits for regulated residential work and applies county zoning to rural parcels.¹² Clatsop County also issues septic permits for homes outside public-sewer service.³ A new home outside city limits needs a county development permit first,⁴ so start with Land Use Planning before designing, then coordinate building and septic approvals with the county offices listed below.⁵⁶⁷

At a glance

Building permit: Required for regulated residential work in unincorporated areas¹
Zoning: County zoning applies in unincorporated Clatsop County²
Septic: Clatsop County permits systems where public sewer is unavailable³
Owner-builder: A narrow state exemption exists, but a building permit is still required⁸
RV living: Temporary use is conditional; recreation parks cannot allow permanent occupancy⁹¹⁰
Tiny home: No separate county category confirmed; a new home needs a development permit, and dwellings of 400 sq ft or less follow the state Small Home Specialty Code¹¹¹²
Well construction: A landowner permit, financial security and fee may apply¹³

Who to call

Building permits

Clatsop County Building Codes Division

Adopted building codes in unincorporated Clatsop County, electrical codes within the county's jurisdiction, permit applications, records and inspections

503-338-3697

buildingdivision@clatsopcounty.gov

800 Exchange Street, Suite 100, Astoria, OR 97103

Online permits →

Zoning

Clatsop County Land Use Planning Division

Zoning and land-use information, development permits, conditional uses, map amendments, variances, land divisions, and hazard-zone permit review in unincorporated Clatsop County

503-325-8611

comdev@clatsopcounty.gov

800 Exchange St, Suite 100, Astoria, OR 97103

Septic permits

Clatsop County Onsite Septic

Onsite septic site evaluations, construction-installation permits and inspections for Clatsop County properties not served by public sewer

(503) 338-3687

septic@clatsopcounty.gov

800 Exchange Street, Suite 100, Astoria, Oregon 97103

Contact details are copied from each office’s official page and were checked against it on October 10, 2026.

Off-grid gear

Going off-grid in Clatsop 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 Clatsop County, Oregon?

Yes. An owner or authorized agent must obtain the required permit before constructing, enlarging, altering, repairing, moving or changing the occupancy of a residential building or structure regulated by the Oregon Residential Specialty Code.¹ Clatsop County Building Codes administers adopted codes in unincorporated areas and administers electrical codes across both incorporated and unincorporated parts of its jurisdiction.¹⁴ In unincorporated Clatsop County, a development permit is required to build a new home, and the Building Codes Division then determines which building permits Oregon law requires.⁴ Permit exemptions can apply to particular work, so the safest first question for the Building Codes Division is whether the exact scope needs structural, mechanical, plumbing or electrical approval.¹ A qualifying agricultural building may be exempt from the structural code, but the exemption does not cover a dwelling and does not erase electrical, plumbing or mechanical permit requirements.¹⁵ Clatsop County building fees vary by permit type and project valuation, which the Building Official determines, and every county application carries a 3% technology fee on top of the 12% state surcharge, so ask the Building Codes Division for an estimate before you budget.¹⁶¹⁷

Who is the Clatsop County building department, and how do you reach it?

The Clatsop County Building Codes Division is the permit office for adopted building codes in unincorporated Clatsop County.¹⁴ Reach the division at 503-338-3697 or buildingdivision@clatsopcounty.gov, or visit 800 Exchange Street, Suite 100, Astoria, Oregon 97103.⁶ The county directs applicants to Oregon ePermitting to view development and building applications and supporting documents, apply for available permits, and schedule inspections.⁶ Land-use applications do not follow that same online path, so contact the Land Use Planning Division at 503-325-8611 or comdev@clatsopcounty.gov before treating a building application as zoning approval.⁶⁵ Inside a city, the relevant city handles its own land-use questions; county planning staff handles potential uses of property in unincorporated Clatsop County.⁵

Does Clatsop County have zoning?

Yes. Clatsop County Land Use Planning applies the Land and Water Development and Use Code to unincorporated land and reviews development permits, conditional uses, map amendments, variances, partitions, subdivisions, and permits in geologic-hazard and flood-hazard zones.² A parcel inside an incorporated city is governed by that city's land-use rules, so county zoning advice should not be carried across a city boundary.¹⁸ Setbacks are not countywide constants: in the reviewed residential district, front yards vary with road classification, side and rear yards vary with lot or housing type, and all structures have a specific aquatic-area setback.¹⁹ Dividing land outside city limits or urban growth boundaries into three or more new parcels requires a subdivision request and compliance with zoning, parcel-size, access, hazard and sanitation standards.²⁰ The county's Web Maps show zoning for properties outside urban growth boundaries and city limits, and its Zoning Guide lists setbacks and permitted uses by district.²¹ District lot sizes differ widely: in the Rural Service Area-Multi-Family Residential zone, a detached dwelling needs 5,000 square feet with state-approved sewer and 15,000 square feet without it.²² Ask Land Use Planning to identify the parcel's district before relying on a setback or division plan.⁵

How do septic permits work in Clatsop County?

Clatsop County's Onsite Septic Program issues permits for households that are not served by public sewer.³ A parcel relying on onsite sanitation must be large enough to meet Oregon DEQ requirements for a septic tank and drain field or another approved system and to continue using that disposal method.²³ For a new home system with projected flow below 2,500 gallons per day, obtain a favorable site evaluation before applying for the construction-installation permit; the issued permit is valid for one year.²⁴ A pre-cover inspection is required unless the local onsite agent waives it, and the system may be covered only after a satisfactory inspection.²⁵ Only about 0.8% of county land is rated without severe limitations for a conventional drain field, so soil, water-table, surface-water and well conditions can materially affect feasibility and budget.²⁶²³ Septic permits are separate from development and building permits and come from the county's septic program.³ Reach Clatsop County Onsite Septic at (503) 338-3687 or septic@clatsopcounty.gov.⁷

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

Do not assume that owning rural land creates an unrestricted right to occupy an RV. Oregon allows temporary occupancy of a camping vehicle on private land only with the owner's consent, adequate space for approved water and sewage facilities, and compliance with applicable sanitation, plumbing, electrical and sewer rules.⁹ In a county-regulated recreation vehicle park, permanent occupancy is prohibited and an RV may remain no more than 30 days in any 60-day period.¹⁰ The park rule does not establish the limits for an ordinary private parcel, so ask Land Use Planning about the parcel, zoning district and proposed duration.⁵ Clatsop County has no separate tiny-home category that we could confirm, so a tiny home is treated like any new home: it needs a county development permit, a use permitted in the zoning district, and documentation of water, septic feasibility and legal access.¹¹ A dwelling of 400 square feet or less must also meet the state Small Home Specialty Code.¹² We could not confirm a countywide minimum dwelling floor area. Manufactured dwellings are allowed only where the applicable zoning and placement standards permit them, with water, sewage, electrical, setback, space and access requirements.²⁷

Building a home in Clatsop County: the steps, in order

Ask Land Use Planning to confirm the parcel's jurisdiction, zoning, allowed dwelling type, district-specific setbacks and any geologic- or flood-hazard review.⁵¹⁹ Apply for the county development permit, which comes before building plan review.⁴

If the project includes a land division, resolve subdivision review, parcel size, access, hazards and sanitation before designing the home.²⁰

Determine water and wastewater service early; where public sewer is unavailable, obtain the county septic site evaluation before applying for a new-system construction permit.²³²⁴

Apply for a county approach-road permit before building or altering a driveway onto a public or county road, and a floodplain development permit before any work if the property is in the 100-year Special Flood Hazard Area.²⁸²⁹

If a landowner will construct a well, secure the required state landowner permit, fee and financial security before work unless a licensed and bonded Water Supply Well Constructor performs it.¹³

Submit the required building application before regulated residential work begins, then complete required building and septic inspections before covering work or occupying the home.¹²⁵⁶

What should you check before buying land in Clatsop County?

Confirm the boundary between unincorporated county land and a city first, because Clatsop County administers rural zoning while each city answers for property within its limits.¹⁸ Ask Land Use Planning for the zoning district, allowed dwelling type, setbacks, access constraints and any geologic- or flood-hazard review tied to the parcel.⁵ Treat wastewater feasibility as a purchase condition: only about 0.8% of county land is rated without severe limitations for a conventional septic drain field.²⁶ The county receives about 88.8 inches of precipitation annually, only about 17.5% of its land has a slope of 15% or less, and about 86.8% is wooded, which makes drainage, slope and clearing questions especially practical.³⁰³¹³² We could not confirm a countywide rule requiring every parcel to connect to a public or private water or sewer utility, so ask planning and the relevant service provider about the specific address.⁵

Watch-outs

An Oregon owner-builder exemption is narrow: it relaxes only specified structural-code requirements and does not eliminate the building permit.⁸
A composting toilet does not eliminate wastewater approvals; plumbing fixtures still need an approved septic connection, and property inside a sewer district still needs a sewer connection.³³
Clatsop County's recreation-park limits do not establish the duration allowed on an ordinary private parcel; ask Land Use Planning about the specific parcel and proposed stay.¹⁰⁵
A stay of 30 consecutive days or less in unincorporated Clatsop County requires a Short Term Rental Permit, and rental properties must also register for the county transient room tax, so confirm both before buying land for vacation-rental income.³⁴

Sources

Written October 10, 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.

Compared with neighboring counties

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

Rule	Clatsop County	Columbia County	Washington County	Tillamook County	Multnomah County	Yamhill County	Polk County
Building permit	Required	Required	Not required	Required	Required	Limited	Required
County zoning	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Septic permits	County Env. Health	County Land Development Services	County Env. Health	County Community Development	City of Portland Permitting & Development	County Planning & Development	County Env. Health

How Clatsop County scores

Seclusion43100% ev.

Self-Sufficiency50100% ev.

Admin Boringness42100% ev.

Durability46100% ev.

Property Autonomy72100% ev.

Carry Cost51100% 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 →

$523kTypical home

0.7%Property tax

$9,702Land / acre

88.8"Annual rain

4.7% of yrsSevere drought

0 / yr (+0)Mid-century 100°F days

18.5 daysMid-century dry spell

3.44" (+7.3%)Mid-century 1-day rain

1.29×Wildfire change factor

100%Forward climate coverage

$1,291Home insurance / yr

4.2% / yrInsurance growth

0.76%Nonrenewal rate

county median (2+ published ZIPs)Insurance basis

18,467People within 30 min

2,759,850People within 2 hr

22,187Radius comparison (15 mi)

49.6People / sq mi

22.6%Federal land

17.5%Land at 15% slope or less

0.8%Soils rated "not limited" for septic (strict USDA rating)

3,714 acWorkable land screen

86.8%Wooded land

88.6 tonsBiomass / forest ac

50.1°FAvg temp

Answers from the rulebook for Clatsop County

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

Clatsop County rules

Building code adoptedAdopted (with conditions)
Clatsop County's adopted building-code program in unincorporated areas; electrical-code enforcement also extends to incorporated areas of the county's jurisdiction.
- The County Building Codes Division administers and enforces all aspects of adopted codes in unincorporated areas.
- Electrical codes are administered and enforced in both unincorporated and incorporated areas of the county's jurisdiction.
- The adopted code incorporates the Oregon Structural, Mechanical, Plumbing, Electrical, and One- and Two-Family Dwelling Specialty Codes identified in Clatsop County Code 15.04.270, plus manufactured dwelling park/mobile home park rules, manufactured dwelling rules, recreational park and organizational camp rules, and the 1997 Uniform Code for the Abatement of Dangerous Buildings, except as modified by the jurisdiction.
- The program is self-supported by revenue from construction-document review and permit issuance under a fee schedule approved by the Clatsop County Board of Commissioners.
fee schedule adoption date: July 2022 (The Building Codes page identifies the current fee schedule as adopted July 2022.)
“The Clatsop County Building Codes Division (BCD) administers and enforces all aspects of the adopted codes in the unincorporated areas”
Building Codes ↗Re-checked Sep 24, 2026
County-wide zoningPresent (with conditions)
County zoning and land-use regulation in unincorporated Clatsop County.
- Clatsop County Land Use Planning applies the County's Land and Water Development and Use Code (LAWDUC) in unincorporated areas.
- County land-use review includes development permits, conditional uses, comprehensive and zoning map amendments, variances, partitions, subdivisions, and permits in geologic hazard and flood hazard zones.
- Properties within a city are subject to that city's rules and the applicant must contact the city directly.
- Federal and tribal lands are excepted from the county page's statement that every inch of Oregon is planned and zoned.
“The comprehensive plan and zoning ordinances are the guiding documents Clatsop County uses to make land use decisions.”
Land Use Planning ↗Re-checked Sep 24, 2026
Local zoningVaries (with conditions)
Aggregate local zoning across unincorporated Clatsop County and incorporated cities within the county.
- In unincorporated areas, Clatsop County Land Use Planning administers LAWDUC and county zoning-related review.
- For land within a city, the relevant city administers its own local land-use rules; the county directs applicants to contact that city directly.
- The aggregate conclusion varies by jurisdiction because county rules apply outside cities while city rules apply within city boundaries.
- Federal and tribal lands are excluded from the county's general statement that every inch of Oregon is planned and zoned.
“You must contact the city in which the property is located for information about zoning, getting a development permit or for other use information.”
Land Use Planning ↗Re-checked Sep 24, 2026
Zoning districtsPublished (with conditions)
Zoning districts and related zoning information for properties outside urban growth boundaries and city limits, including listed rural service areas such as Arch Cape, Jeffers Gardens, Knappa-Svensen, and Miles Crossing.
- Zoning information is available through county Web Maps or by contacting Land Use Planning.
- Setback requirements and permitted uses are provided in the county Zoning Guide.
- The county Land and Water Development and Use Code combines zoning, subdivision, land partitioning, use and activity standards, and transportation standards.
“Zoning information is available on Web Maps or by contacting the Land Use Planning office. [...] Setback requirements and permitted uses can be found in the Zoning Guide.”
Zoning & Land Use Regulations ↗Re-checked Oct 5, 2026
Minimum lot sizeDistrict specific (with conditions)
Residential development in the Rural Service Area-Multi-Family Residential (RSA-MFR) zone in unincorporated Clatsop County.
- With state-approved sewer, the code lists 5,000 square feet per unit for attached, multi-unit, quadplex, and triplex dwellings; 5,000 square feet for detached, mobile-home, and boarding/rooming-house uses; 10,000 square feet for duplexes; 1,500 square feet per unit for cottage clusters; and 50-foot lot width.
- Without state-approved sewer, the code lists 15,000 square feet per unit for attached dwellings, 15,000 square feet for detached and mobile-home dwellings, 20,000 square feet for duplexes, 15,000 square feet for the first multi-unit/quadplex/triplex unit plus 5,000 square feet for each additional unit, 10,000 square feet for the first cottage-cluster unit plus 2,500 square feet for each additional unit, and 15,000 square feet for boarding or rooming houses; lot width is 60 feet.
- Conditional-development lot size is based on the size needed for the proposed use, impacts on adjacent properties, state sanitation requirements, and applicable setback and development standards.
- Lot width/depth may not exceed a 1:3 ratio and maximum lot coverage is 40%.
minimum lot size for detached dwelling with state-approved sewer: 5000 sq ft · minimum lot size for detached dwelling without approved sewer: 15000 sq ft · minimum lot size for duplex with state-approved sewer: 10000 sq ft · minimum lot size for duplex without approved sewer: 20000 sq ft · minimum lot size for multi-unit, quadplex, or triplex without approved sewer: 15,000 first unit plus 5,000 for each additional unit sq ft
“Dwelling, detached 5,000 SF 50’ [...] Dwelling, duplex 20,000 SF 60’”
Article 4 - Zone Regulations, Clatsop County Land and Water Development and Use Code ↗Re-checked Oct 10, 2026
SetbacksDistrict specific (with conditions)
Residential development in the county zone governed by LAWDUC Section 4.1140.
- Front-yard setback depends on the abutting road classification.
- Rear-yard setback is 20 feet, with a 5-foot corner-lot exception and a Fishhawk Lake Estates waterfront exception.
- Side-yard standards differ for standard, corner, attached, triplex, quadplex, multi-unit, cottage-cluster, and resource-zone-adjacent situations.
- All structures require a 35-foot setback from aquatic areas as defined in Section 1.0500.
- The target parcel's zone was not provided.
front yard, major arterial: 50 feet · front yard, minor arterial: 30 feet · front yard, major collector: 30 feet · front yard, minor collector: 25 feet · front yard, local street: 20 feet · rear yard, standard lot: 20 feet · rear yard, corner lot: 5 feet · side yard, standard lot: 5 feet · aquatic-area setback: 35 feet (All structures.)
“Major arterial: 50 feet. [...] Standard lot: 5 feet”
Article 4 - Zone Regulations, amended Ordinances 25-08 and 25-16 ↗Re-checked Oct 1, 2026
Living in an RVLimited
Recreational-vehicle occupancy in county-regulated recreation vehicle parks in unincorporated Clatsop County.
- The park must be in an area where it is permitted.
- No recreational vehicle may remain in the park more than 30 days in any 60-day period.
- The park may not use accommodations for mobile homes or recreational vehicles used for permanent occupancy.
- One mobile home unit may be used only by the park manager or caretaker.
- The park must provide safe and sanitary accommodations and adequate utility services.
maximum stay: 30 days in any 60-day period
“No recreation vehicle shall remain the park for more than thirty (30) days in any sixty (60) day period. No habitable vehicle, which is not a recreation vehicle, shall be allowed in the park for any period with the exception of one mobile home unit for the exclusive use of the park manager and/or caretaker.”
Article 3 — Structure Siting and Development Standards ↗Re-checked Sep 24, 2026
One more reviewed finding on this topic
- Limited — Recreational-vehicle occupancy in a county-regulated recreation vehicle park in unincorporated Clatsop County.
  “thirty (30) days in any sixty (60) day period.”
  Clatsop County Land and Water Development and Use Code, Article 3, amended Ordinance 25-16 ↗Re-checked Oct 1, 2026
Tiny homesLimited
A new small home or other dwelling proposed outside city limits or urban growth boundaries in Clatsop County.
- A Clatsop County development permit is required to build a new home.
- The proposed use must be verified as permitted in the property's zoning district.
- The applicant must address applicable hazard overlays, including flood, wetlands, or geologic hazards.
- The applicant must provide documentation of a water source, sewer service or ability to install septic, and legal access.
- After a development permit is issued, the County Building Codes Division reviews building plans and determines which building permits are necessary under Oregon law.
- The County identifies the 2023 Oregon Residential Specialty Code as effective and mandatory for administrative provisions October 1, 2023; construction provisions were effective October 1, 2023 with a six-month phase-in and mandatory April 1, 2024.
“A development permit is required to build a new home.”
Applications ↗Re-checked Oct 7, 2026
Manufactured homesAllowed (with conditions)
Manufactured and prefabricated dwellings for residential use in county-regulated manufactured dwelling parks and other county zoning districts where manufactured dwellings are listed as permitted uses.
- Manufactured dwelling parks must comply with applicable state standards and county standards.
- A manufactured dwelling placement permit is required; the fee depends on whether the installation is single-, double-, or triple-wide, plus a 12-percent state surcharge and 3-percent technology fee.
- If the foundation is over 2 feet high, a foundation plan review and separate building permit are required; the plan review fee is 75 percent of the calculated building permit fee.
- For a manufactured dwelling park, each individual structure must obtain zoning review and permits before construction; park approval does not approve the individual dwelling or structures.
- Sewage, water, electrical, setback, space, and access requirements apply.
foundation height threshold: > 2 feet (Triggers foundation plan review and separate building permit) · state surcharge: 12 percent · technology fee: 3 percent
“Manufactured dwellings and prefabricated dwellings for residential use.”
Article 3 — Manufactured Dwelling Park Development ↗Re-checked Sep 24, 2026
Who permits septicCounty
The onsite septic program serving Clatsop County households that are not served by public sewer.
- The program operates under Oregon DEQ onsite wastewater requirements and applies to onsite septic systems rather than public sewer service.
“Clatsop County's Onsite Septic Program issues septic system permits for households that are not served by public sewer.”
Onsite Septic Systems ↗Re-checked Sep 24, 2026
Septic permitRequired
Installation of a septic system for a home or commercial system with projected sewage flow less than 2,500 gallons per day in Clatsop County.
- A favorable site evaluation report is required before applying for the construction-installation permit.
- The application must include required fees, exhibits, construction plans, and information about approved property uses.
- The permit is valid for one year.
- A construction-installation permit is issued within 20 days of receiving a completed application.
- Design changes require prior county approval.
- Systems must be constructed by the property owner or a DEQ-licensed installer using DEQ-approved materials and equipment.
- Larger or more complex systems require contacting the Clatsop County Onsite Septic System Program for permit requirements.
projected sewage flow threshold: < 2500 gallons per day (The source states the ordinary construction-installation permit is usually for systems with projected sewage flow less than 2,500 gallons per day.) · permit validity: 1 year (The permit may be renewed or reinstated for an additional fee if construction takes longer.)
“A construction-installation permit is required to install any septic system that has a projected sewage flow of less than 2,500 gallons per day. Permits are valid for one (1) year.”
Installing a New Septic System ↗Re-checked Sep 24, 2026
Septic inspectionRequired
Construction and installation of septic systems in Clatsop County before the installation is covered with soil.
- A pre-cover inspection is required unless waived by the local onsite agent.
- Complex systems, including sand filter systems, may require inspections at various construction stages as specified in the permit.
- The installer must provide an as-built plan, materials list, and system certification.
- The local onsite agent will conduct or waive the inspection within seven days after receiving the completed inspection form.
- The installation may be covered only after a satisfactory inspection; a certificate of satisfactory completion is then issued before use begins.
inspection response period: 7 days (The local onsite agent may conduct or waive the inspection within this period.)
“A “pre-cover” inspection (before it is covered with soil) of the installation is required unless waived by the local onsite agent.”
Installing a New Septic System ↗Re-checked Sep 24, 2026
Off-grid sanitationLimited
Onsite sanitation using a septic tank and drain field or another approved alternative system where a residential location is not served by public sewer.
- The parcel must be sufficiently large to comply with Oregon DEQ sewage-disposal requirements and continue relying on onsite disposal.
- The county's onsite septic program issues permits for households not served by public sewer.
- Site, soil, water-table, surface-water, well, property-size, and sewer-availability conditions affect system suitability.
- Septic permitting, construction, inspection, and applicable DEQ rules still apply.
“In a location that will not be served by a public sewer, a lot or parcel shall have sufficient size to permit compliance with the requirements of the Department of Environmental Quality for sewage disposal by septic tank and drain field or other alternative system and permit continued reliance on that method of sewage disposal.”
Clatsop County Land and Water Development and Use Code, Article 1 ↗Re-checked Sep 24, 2026
Subdividing landRegulated (with conditions)
Subdivisions and other land divisions outside city limits or urban growth boundaries in Clatsop County.
- The Land Use Planning office accepts subdivision applications for land outside urban growth boundaries and city limits.
- A subdivision request is required for a division creating three or more new parcels according to the county applications page.
- The proposed division must comply with the county's zoning ordinance and applicable parcel-size, access, hazard, sanitation, and other requirements.
subdivision threshold: 3 or more new parcels (County applications page terminology.)
“A subdivision request is required for a division of land that creates three or more new parcels.”
Applications ↗Re-checked Oct 1, 2026
Driveway accessRequired
Construction or alteration of a private driveway, approach road, or other facility providing ingress to or egress from a public or county road.
- A permit is required for changing the use of an existing access or replacing an existing residence.
- The approach-road permit requires two separate approvals: initial approach location and completed construction.
- The application directs the applicant to mark the approach-road location with flagging tape.
“Required for construction or alteration of a private driveway, approach road or other facility that provides ingress to, or egress from, a Public or County Road, changing the use of an existing access or replacing existing residence.”
Permits ↗Re-checked Oct 5, 2026
One more reviewed finding on this topic
- Required — Construction or alteration of a private driveway, approach road, or other facility providing ingress to or egress from a Public or County Road.
  “Required for construction or alteration of a private driveway, approach road or other facility that provides ingress to, or egress from, a Public or County Road, changing the use of an existing access or replacing existing residence.”
  Permits ↗Re-checked Oct 5, 2026
Building in a floodplainRequired
Construction or development within any area of special flood hazard in Clatsop County.
- A Floodplain Development Permit must be obtained before construction or development begins.
- The application must be made to the Floodplain Administrator on county forms before development activities start.
- Previously exempt structures still require a Floodplain Development Permit but do not have an application fee.
- Previously exempt categories include public-agency signs, markers and aids; driveways, parking lots or open-space areas without topographic alteration; qualifying minor repairs or improvements; customary dredging for routine channel maintenance; replacement utility facilities serving established permitted uses; accessory residential or non-commercial structures under 200 square feet; and residential equipment or material storage.
floodplain development permit fee: 110 USD (Previously exempt structures have no application fee but still require the permit.) · livable space elevation: 1 foot above Base Flood Elevation
“Properties that are within the 100-year Special Flood Hazard Area must obtain a floodplain development permit prior to starting any work.”
Clatsop County Land and Water Development and Use Ordinance ↗Re-checked Oct 5, 2026
Short-term rentalsLimited
Short-term rentals in the unincorporated area of Clatsop County.
- A Short Term Rental Permit is required.
- The cited county FAQ applies to the unincorporated area; incorporated city rules are outside this claim.
- The county separately states that rental properties and transient lodging intermediaries must register with the county for transient-room-tax purposes.
transient lodging period: <= 30 consecutive days or less
“If you own a Short Term Rental in the Unincorporated Area of Clatsop County you need to apply for a Short Term Rental Permit.”
Transient Room Tax FAQ's ↗Re-checked Oct 5, 2026
Permit feesPublished (with conditions)
Clatsop County building permit fees and related county permit fees.
- Actual building fees vary by project valuation and permit type.
- The Building Official determines project valuation.
- The fee page states that new building fees took effect July 1, 2022; projects permitted before July 1, 2022 are not subject to the new fee schedule.
- The county fee schedule separately lists land-use and floodplain review fees, including a $110 Floodplain and Other Review Type I fee.
permit valuation basis: cost per square foot published by the International Codes Council or contractor valuation · floodplain and other review Type I fee: 110 USD · plan review percentage: 75 percent of building permit fee · state surcharge: 12 percent of building permit fee · technology fee: 3 percent of building permit fee
“Actual fees are determined by the Building Official based on valuation of the project. The Division policy as established by the Building Official for determination of the valuation of the project is based on the cost per square foot (published by the International Codes Council) or contractor's valuation.”
Permit Fee Schedule ↗Re-checked Oct 5, 2026
One more reviewed finding on this topic
- Published (with conditions) — Clatsop County building-code applications and permits, particularly those administered by the Building Codes Division.
  “Adopted by Board Resolution June 8, 2022 Fees effective July 1, 2022”
  Current Fee Schedule adopted July 2022 ↗Re-checked Oct 5, 2026
Permit processPublished (with conditions)
Development and building permits for land outside city limits or urban growth boundaries.
- A development permit is required to build a new home.
- After the development permit is issued, the Building Codes Division reviews building plans and determines which building permits are necessary under Oregon law.
- Before applying, the applicant should verify zoning, identify hazard overlays such as flood, wetlands, or geologic hazards, and obtain documentation of water, sewer or septic feasibility, and legal access.
- Land Use Planning applications cannot be submitted through the Accela E-Permitting system; applicants must contact a Land Use Planner.
“A development permit is required to build a new home. After a development permit is issued, Clatsop County's Building Codes Division reviews building plans and determines which building permits are necessary to comply with Oregon State Laws.”
Applications ↗Re-checked Oct 5, 2026

Oregon rules that apply here

Building permitRequired
Construction, enlargement, alteration, repair, movement, or change of occupancy of residential buildings and structures regulated by the Oregon Residential Specialty Code in Clatsop County, including applicable unincorporated areas administered by Clatsop County.
- The owner or authorized agent must apply to the building official and obtain the required permit before the regulated work is performed.
- The rule applies to work regulated by the Oregon Residential Specialty Code; permit exemptions in Section R105.2 and locally applicable rules may apply.
- Clatsop County administers and enforces adopted codes in unincorporated areas; incorporated municipalities may administer their own building programs.
“Any owner or owner’s authorized agent who intends to construct, enlarge, alter, repair, move or change the occupancy of a building or structure [...] shall first make application to the building official and obtain the required permit.”
2023 Oregon Residential Specialty Code - Chapter 1 ↗Re-checked Sep 24, 2026
Owner-builder exemptionAvailable (with conditions)
Owner-built single-family residences and adjacent auxiliary structures in Oregon where the structural components are constructed entirely by the owner intending to occupy the structures, or by the owner with unpaid assistance from friends and relatives.
- The owner must be the recorded title owner or contract purchaser shown on the last available complete assessment roll.
- The owner must not have used the subsection (2) exemptions during the five years before applying again.
- The exemption applies only to structural-code requirements for ceiling heights, room sizes, and maintenance of specific temperature levels.
- It applies to new construction, renovation, remodeling, or alteration of an owner-built dwelling or outbuilding.
- A building permit must be issued and must note whether the owner-built dwelling or outbuilding complies with the exempted requirements.
- If the structure does not comply with those requirements, the owner-builder must file a copy of the building permit with the county clerk for permanent deed records and provide a legally sufficient property description.
- Noncompliance with the filing requirement does not affect conveyance of an interest in the property.
prior use lookback: 5 years (The owner must not have previously taken advantage of the subsection (2) exemptions during that period.)
“Owner-built dwellings and outbuildings shall be exempt from any requirements of the structural code for ceiling heights, room sizes”
2023 Oregon Residential Specialty Code - ORS 455.320 reprinted ↗Re-checked Sep 12, 2026
One more reviewed finding on this topic
- Conditional — Owner-built single-family residences and adjacent auxiliary structures in Clatsop County that are constructed entirely by the owner, or by the owner and unpaid friends or relatives, where the owner intends to occupy the structures.
  “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.”
  2023 Oregon Residential Specialty Code - Chapter 1 ↗Re-checked Sep 24, 2026
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.”
Oregon Revised Statutes, ORS 455.320 ↗Re-checked Oct 1, 2026
Camping on your landAllowed (with conditions)
Occupancy of a manufactured dwelling or camping vehicle on private land in Oregon.
- The landowner must consent.
- The lot, tract or parcel must have adequate area for safe, approved water supply and sewage disposal facilities.
- The use must not conflict with ORS 446.310 (9).
- The person must comply with all applicable state or local standards for sanitation, water, plumbing, electrical and sewerage installations.
“446.125 Occupancy on private land. A person may occupy a manufactured dwelling or a camping vehicle on private land with the consent of the owner of the land if: (1) The lot, tract or parcel of land upon which the manufactured dwelling or camping vehicle is situated has an area adequate to provide safe, approved water supply and sewage disposal facilities and is not in conflict with ORS 446.310 (9). (2) The person complies with all applicable standards of sanitation, water, plumbing and electrical and sewerage installations prescribed by the laws of this state and the rules issued thereunder, or by local authorities.”
Oregon Revised Statutes, ORS 446.125 Occupancy on private land ↗Re-checked Oct 1, 2026
Accessory dwellingsLimited
Accessory dwelling units in areas within an urban growth boundary zoned for detached single-unit dwellings in a city with population greater than 2,500 or a county with population greater than 15,000.
- The local government must allow at least one accessory dwelling unit for each detached single-unit dwelling.
- Local regulations may address siting and design but may not include owner-occupancy requirements for the primary or accessory structure or requirements to construct additional off-street parking.
- Local governments may regulate vacation occupancies to require owner-occupancy or off-street parking.
city population threshold: > 2500 persons · county population threshold: > 15000 persons · minimum ADUs per detached single-unit dwelling: >= 1 unit
“A city with a population greater than 2,500 or a county with a population greater than 15,000 shall allow”
Oregon Revised Statutes, ORS 197A.425 ↗Re-checked Sep 12, 2026
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”
Landowner Constructed Wells ↗Re-checked Oct 5, 2026
One more reviewed finding on this topic
- Limited — Construction, alteration, conversion, or abandonment of a water-supply well by a landowner in Clatsop County under Oregon statewide well-construction rules.
  “The Water Resources Commission requires a permit, permit fee, and bond or irrevocable letter of credit, for each water supply well constructed, altered, converted, or abandoned by a landowner, unless the landowner is a licensed and bonded Water Supply Well Constructor.”
  Landowner Constructed Wells ↗Re-checked Sep 24, 2026
Mandatory utility hookupSewer (with conditions)
A building located within an Oregon sewer district, including a building using a composting toilet.
- The source specifically addresses buildings within a sewer district.
- A composting toilet does not eliminate the sewer-connection requirement.
“What if my building is within a sewer district? Your building will still need a sewer connection.”
What do I do with the finished material? ↗Re-checked Sep 12, 2026
Agricultural exemptionConditional
Agricultural building structural-code exemption under ORS 455.315 for qualifying farm or forest-operation structures, including in unincorporated Clatsop County.
- The exemption applies only to Oregon Structural Specialty Code requirements; electrical, plumbing, and mechanical work remains subject to the applicable permits and specialty codes.
- An agricultural building must be located on a farm or forest operation and used for qualifying agricultural, forestry, horticultural, animal-husbandry, crop, livestock, dairy, machinery, or produce/forest-product activities.
- The exemption does not include dwellings, structures with 10 or more persons present at one time when used for a purpose other than growing plants, structures regulated by the State Fire Marshal, structures used by the public, or structures subject to the National Flood Insurance Act provisions listed in the interpretation.
- The local planning department, in conjunction with adopted zoning ordinances, determines whether the property constitutes a qualifying farm or forest operation.
- The interpretation states that if the use meets ORS 455.315 parameters and is on a legally designated parcel for the intended use, the exemption applies.
- Additional personal or household uses are conditionally allowed only when incidental and accessory, personal to the farm owner and immediate family or household, and not more hazardous than the qualifying agricultural uses.
- The statewide interpretation was issued May 26, 2011 and last updated October 1, 2025; the additional-use amendments are stated to be effective January 1, 2022.
maximum persons for excluded non-plant-growing structure: < 10 persons (The interpretation excludes a structure used for a purpose other than growing plants in which 10 or more persons are present at any one time) · additional personal or household use: allowed only when incidental and accessory, personal to the farm owner and immediate family or household, and no greater hazard
“The exemption only applies to the requirements of the OSSC. Any electrical, plumbing or mechanical work is subject to permit and must comply with the respective specialty code provisions.”
Statewide Code Interpretation No. 13-03: Agriculture/Forestry/Additional Uses ↗Re-checked Oct 5, 2026
One more reviewed finding on this topic
- Available (with conditions) — Qualifying agricultural buildings, agricultural grading, equine facilities and dog-training facilities under Oregon structural-code law.
  “The provisions of this chapter do not authorize the application of a state structural specialty code to any agricultural building, agricultural grading, equine facility or dog training facility.”
  Oregon Revised Statutes, Chapter 455 ↗Re-checked Sep 12, 2026
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.”
Oregon Revised Statutes, Chapter 215 — County Planning; Zoning; Housing Codes ↗Re-checked Sep 21, 2026
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.”
Oregon Revised Statutes, Chapter 455 — Building Code ↗Re-checked Sep 21, 2026

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.

Living off-grid in Clatsop County, Oregon

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

Clatsop County scores 56/100 on the Bolthole Index, a solid county profile. Its strengths: a stronger property-autonomy legal backdrop. Watch-outs: more administrative friction around building and land use.

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

Clatsop County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Clatsop County Environmental Health / Community Development - Onsite Septic Program. 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 Clatsop County?

Living in an RV on your own land in Clatsop County is limited to specific cases: Recreational-vehicle occupancy in county-regulated recreation vehicle parks in unincorporated Clatsop County. The park must be in an area where it is permitted. No recreational vehicle may remain in the park more than 30 days in any 60-day period. A tiny home is limited to specific cases. Confirm with the county before relying on it.

How much does land cost in Clatsop County, Oregon?

Land in Clatsop County runs about $9,702 per acre, based on the latest county data.

What is the water situation in Clatsop County?

Clatsop County gets about 88.8" of rain a year, with severe drought in roughly 4.7% of years.

How remote is Clatsop County?

A representative private-land location has about 18,467 people within a 30-minute drive and 2,759,850 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.

Building permits, zoning and land rules in Clatsop County, Oregon

At a glance

Who to call

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

Who is the Clatsop County building department, and how do you reach it?

Does Clatsop County have zoning?

How do septic permits work in Clatsop County?

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

Building a home in Clatsop County: the steps, in order

What should you check before buying land in Clatsop County?

Watch-outs

Sources

Compared with neighboring counties

Clatsop County in Oregon

How Clatsop County scores

Find land. Bring the promising ones back.

Parcel due diligence

Cities and towns in Clatsop County

Answers from the rulebook for Clatsop County

Clatsop County rules

Oregon rules that apply here

Living off-grid in Clatsop County, Oregon

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

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

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

How much does land cost in Clatsop County, Oregon?

What is the water situation in Clatsop County?

How remote is Clatsop County?

How Clatsop compares in Oregon