Bolthole Index

Washington County, Utah

Building permits, zoning and land rules in Washington County, Utah

42Index Score / 100
#19 of 29 in Utah

Unincorporated Washington County, Utah requires a written building permit before construction begins1. Washington County zones unincorporated land, while incorporated cities and towns control their own planning23. Off-grid property still needs public sewer or an approved onsite wastewater system, and septic work requires a permit and approved design from the Southwest Utah Public Health Department45.

At a glance

Building permit
Required in county-regulated areas before construction begins16
Zoning
Yes; county zoning applies outside incorporated cities and towns2
Septic
Permit and approved design required through Southwest Utah Public Health Dept.; only 10.9% of soils avoid severe conventional drain-field limits78
Owner-builder
Contractor-license exemption: up to 1 home a year and 3 in five years for the owner's noncommercial use; permits still apply9
Wells
Statewide permit (Start Card) via the Division of Water Rights; licensed driller required10
RV living
Private-land camping is unconfirmed; an RV park is conditional only in the MH zone11
Tiny home
A foundation tiny home is 150–1,000 sq. ft.; parcel-specific occupancy approval remains unconfirmed12
Manufactured home
The MH district allows manufactured homes; Pine Valley applies a 1,400-square-foot minimum1314

Who to call

Building permits

Washington County Community Development

Building permits, plan review, inspections, zoning and subdivision regulation for unincorporated Washington County; Planning & Zoning and Building have merged into this single department

(435) 301-7250

111 East Tabernacle St., St. George, UT 84770

Roads & driveways

Washington County Public Works

Road, engineering and driveway/access standards for unincorporated Washington County

(435) 301-7670

Septic permits

Southwest Utah Public Health Department — Washington County

Septic (onsite wastewater) permits, plan review and inspections for Washington County

(435) 673-3528

620 South 400 East, St. George, UT 84770

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 Washington 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 Washington County, Utah?

Yes. Construction in Washington County's county-regulated jurisdiction may not begin until the building inspector issues a written building permit1. Community Development reviews plans, issues building permits and inspects structures through construction15. The statewide construction standards include the 2024 International Building Code and the 2021 International Residential Code, with applicable amendments1617. Building-permit fees are based on project valuation and carry a 1% state surcharge18. Washington County accepts building-permit applications only through its online permitting system19. An agricultural structure may qualify for an exemption only on more than 2 acres in specified unincorporated zones, and the statewide exemption is limited to structures used solely for agriculture and not for human occupancy2021.

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

Washington County Community Development issues building permits, reviews plans and inspects construction through every phase in the county's jurisdiction15. Planning & Zoning and Building merged into Community Development, so the same counter is the starting point for a building-permit or zoning question6. Community Development also administers subdivision regulations15. A preliminary plat must comply with applicable local, state and federal law and pass staff review before moving forward2223. Ask Community Development about floodplain development approval before starting mapped-floodplain work, and direct county road or driveway-access questions to Public Works2425.

Does Washington County have zoning?

Yes. Washington County administers zoning for unincorporated land, while incorporated cities and towns control their own planning and development23. Minimum lot area is district-specific: A-5 requires 5 acres, RA-1 requires 1 acre and R-1-10 requires 10,000 square feet2627. Setbacks are district-specific too; RA-1 uses a 25-foot front setback and 10-foot side and rear setbacks, while RA-2.5 uses 25 feet on each side28. Accessory dwelling units have a 25-foot minimum setback on all sides29. The cited open-space and agricultural districts have a 35-foot height limit30. The MH district recognizes manufactured homes at up to 6 units per acre, while Pine Valley manufactured housing needs at least 1,400 square feet of living area1314.

How do septic permits work in Washington County?

Wastewater must go to a public sewer or an onsite wastewater system, so off-grid land is not exempt from an approved sanitation route4. The Southwest Utah Public Health Department reviews plans, issues septic permits, conducts inspections and keeps septic-system records in its district31. Before installing, replacing or modifying a septic system, obtain a permit and approved design5. Washington County septic review also requires approval from the Washington County Water Conservancy District or Ash Creek Special Service District31. Only about 11% of county soils rate without severe limits for a conventional drain field, so test the site before relying on a conventional system8. The health department must inspect the system before backfilling32.

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

We could not confirm a general rule allowing temporary RV camping on private land in unincorporated Washington County; ask Community Development about the parcel and proposed duration. An RV park may be approved only as a conditional use in the MH zoning district, but that rule does not authorize living in a single RV on private land11. Utah's separate RV-park health rule also does not answer private-land occupancy33. Washington County defines a Tiny Home on Foundation as a dwelling from 150 through 1,000 square feet, but the definition does not establish where residential occupancy is allowed12. We could not confirm the current parcel-specific approval path for occupying a tiny home; ask Community Development before purchase. Manufactured homes are recognized in the MH district, and Pine Valley applies a 1,400-square-foot living-area minimum to manufactured housing1314. Any occupied off-grid setup still needs public sewer or an approved onsite wastewater system5.

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

  1. Confirm the parcel's jurisdiction, zoning district, minimum lot area, setbacks and height with Community Development before designing6262830.
  2. If dividing land, complete preliminary-plat review before treating proposed lots as buildable2223.
  3. Plan driveway access under county standards; adjacent developments may have to share access3425.
  4. Confirm public sewer service or obtain an approved design, septic permit and required district sign-off4731.
  5. For a well, secure the water right and Start Card before construction and use a licensed driller10.
  6. Apply electronically and receive the written county building permit before work begins191.
  7. Complete required inspections; when a third-party inspection firm completes an inspection and submits its report, state law directs the local regulator to issue the certificate of occupancy35.

What to check before you buy land in Washington County

Confirm the parcel's jurisdiction, zoning district, minimum area, setbacks and height with Community Development before deciding it is buildable6262830. Check whether the parcel is a legal lot because county review considers its creation date, zoning area and approved access36. Check the floodplain map because mapped-floodplain work requires approval before construction starts24. About 77% of Washington County is federal land, so verify boundaries before assuming neighboring ground is privately buildable37. Run septic testing early because only 11% of county soils rate without severe limits for a conventional drain field8. A typical county home carries about a 0.4% effective property-tax rate and a $2,076 annual bill3839.

Watch-outs

  • Washington County septic review requires sign-off from the Washington County Water Conservancy District or Ash Creek Special Service District in addition to the Southwest Utah Public Health Department permit31.
  • A remodel or addition valued at 50% or more of your structure's pre-work value counts as 'substantially improved' under Washington County's floodplain rules and triggers full new-construction review24.
  • Utah's owner-builder exemption is an exemption from contractor licensing, capped at one residential structure per year and three per five years on the owner's property for noncommercial, nonpublic use; building permits, inspections and zoning still apply9.
  • Washington County defines a foundation tiny home as 150–1,000 square feet, but we could not confirm where tiny-home occupancy is allowed; ask Community Development for a parcel-specific answer126.
  • Lot coverage is overlay-specific: Pine Valley has confirmed limits, while the available New Harmony figures come from a draft; ask Community Development which adopted standard controls the parcel40416.

Sources

  1. 10-1-6: Building Permit Required, quoted and re-checked
  2. Zoning Info, quoted and re-checked
  3. Washington County General Plan, quoted and re-checked
  4. Septic Systems - Southwest Utah Public Health Department, quoted and re-checked
  5. Septic Systems - Southwest Utah Public Health Department, quoted and re-checked
  6. Washington County Community Development (washco.utah.gov)
  7. Septic Systems - Southwest Utah Public Health Department, quoted and re-checked
  8. 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
  9. Utah Code Title 58, Chapter 55, quoted and re-checked
  10. Water Well Drilling Information - Utah Division of Water Rights, quoted and re-checked
  11. codelibrary.amlegal.com, quoted and re-checked
  12. codelibrary.amlegal.com, quoted and re-checked
  13. Zoning Info, quoted and re-checked
  14. Pine Valley Overlay Zone, quoted and re-checked
  15. washco.utah.gov, quoted and re-checked
  16. Utah Code § 15A-1-204, Adoption of State Construction Code (Utah statewide rule), quoted and re-checked
  17. Utah Code § 15A-2-103, Specific editions adopted of construction code, quoted and re-checked
  18. Community Development Fees, quoted and re-checked
  19. Apply for a Building Permit, quoted and re-checked
  20. Agricultural Use Exemption, quoted and re-checked
  21. Utah Code § 15A-1-204 (Utah statewide rule), quoted and re-checked
  22. Preliminary Plat Checklist | Washington County Community Development, quoted and re-checked
  23. Preliminary Plat Checklist, quoted and re-checked
  24. Washington County Construction Design Standards, quoted and re-checked
  25. Washington County Public Works (washco.utah.gov)
  26. Zoning Info | Washington County of Utah, quoted and re-checked
  27. Zoning Info, quoted and re-checked
  28. Zoning Info | Washington County of Utah, quoted and re-checked
  29. Zoning Info, quoted and re-checked
  30. Zoning Info | Washington County of Utah, quoted and re-checked
  31. Septic Systems - Southwest Utah Public Health Department, quoted and re-checked
  32. Septic Systems - Southwest Utah Public Health Department, quoted and re-checked
  33. Utah Administrative Code Rule R392-301, Recreational Vehicle Parks (Utah statewide rule), quoted and re-checked
  34. Washington County Construction Design Standards, quoted and re-checked
  35. Utah Code Title 15A, third-party inspection and certificate of occupancy provisions, quoted and re-checked
  36. Frequently Asked Questions (FAQ), quoted and re-checked
  37. Federal land share: Bolthole Index county data
  38. Effective property tax rate: Bolthole Index county data
  39. Median property tax bill: Bolthole Index county data
  40. Pine Valley Overlay Zone, quoted and re-checked
  41. New Harmony Valley Overlay Zone draft, quoted and re-checked

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.

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Compared with neighboring counties

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

RuleWashington CountyIron CountyBeaver CountyKane CountyPiute CountyGarfield CountyMillard County
Building permitRequiredRequiredRequiredLimitedRequiredRequiredRequired
County zoningYesYesYesYesYesYesYes
Septic permitsSouthwest Utah Public Health Dept.Southwest Utah Public Health Dept.Southwest Utah Public Health Dept.Southwest Utah Public Health Dept.Central Utah Public Health Dept.Southwest Utah Public Health Dept.Central Utah Public Health Dept.

County locator

Washington County in Utah

42
County map
Washington County highlighted among the Utah counties · colored by Index score

How Washington County scores

Seclusion82100% ev.
Self-Sufficiency2496% ev.
Admin Boringness40100% ev.
Durability25100% ev.
Property Autonomy60100% ev.
Carry Cost61100% ev.

Evidence strength: 99%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$531kTypical home
0.4%Property tax
$8,684Land / acre
15.2"Annual rain
26.3% of yrsSevere drought
27.7 / yr (+16.7)Mid-century 100°F days
41.7 daysMid-century dry spell
1.04" (+6.6%)Mid-century 1-day rain
1.12×Wildfire change factor
100%Forward climate coverage
$1,061Home insurance / yr
4.1% / yrInsurance growth
1.11%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
35,051People within 2 hr
3,523Radius comparison (15 mi)
83.4People / sq mi
76.5%Federal land
42.8%Land at 15% slope or less
10.9%Soils rated "not limited" for septic (strict USDA rating)
84,085 acWorkable land screen
34.5%Wooded land
11 tonsBiomass / forest ac
56.5°FAvg temp

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Cities and towns in Washington 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: Enterprise · Hildale · Hurricane · Town of Leeds · Town of New Harmony · Town of Rockville · Town of Springdale · Washington

Answers from the rulebook for Washington County

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

Washington County rules

  • Building permitRequired

    Construction, alteration, repair, removal, or moving of any building or structure, and utility systems or other physical improvements on any lot, within Washington County's county-regulated jurisdiction.

    • A written permit from the building inspector must be issued before work commences or proceeds.
    • Building permits must be issued in accordance with the county general plan, road plan, county public works standards and regulations, applicable county boards, commissions, agencies and officials, and other applicable county ordinances, including the county subdivision ordinance.
    “shall not be commenced or proceeded with, except after the issuance of a written permit for the same by the building inspector.”
  • InspectionsRequired

    Construction inspections administered by Washington County for structures under the county's building jurisdiction.

    • The county states that structures are inspected through all phases of construction to ensure compliance with current codes.
    • The county's permit page requires 24-hour notice after work is completed and ready for inspection.
    • A permit number is required when an inspection is scheduled.

    inspection notice: 24 hours

    “This department administers ordinances and assists the public with zoning and subdivision regulations and compliance, and conducts plan reviews for all new construction, issues building permits, and inspects structures through all phases of construction to ensure they comply with current codes.”
  • County-wide zoningPresent (with conditions)

    Zoning administered by Washington County in areas remaining under county jurisdiction outside incorporated cities and towns.

    • The county zoning page provides a county zoning map, area maps, overlay zones, zoning districts, minimum areas, setbacks, widths, and height limits.
    • Incorporated cities and towns have separate planning and development authority.
    “Zoning Maps | Zoning Reference [...] Zoning Maps: Washington County Zoning Map [...] Zoning Reference OST: Open Space Transitional”
  • Local zoningVaries (with conditions)

    Aggregate local zoning across Washington County, including county zoning for unincorporated areas and separate municipal or town zoning within incorporated places.

    • The county aggregate does not mean Washington County administers municipal ordinances.
    • Each incorporated city or town is responsible for its own planning and development.
    • County zoning applies to areas that remain unincorporated and under county jurisdiction.
    “Each incorporated city or town is responsible for its own planning and development. The county has no planning authority over these cities and towns. The areas that are included in the General Plan of Washington County are those areas of the county that are not close enough to a city to have been incorporated and are still under the jurisdiction of the county.”
  • Minimum dwelling sizeDistrict specific (with conditions)

    Manufactured housing within the Pine Valley Overlay Zone.

    • The overlay requires HUD standards, new construction, more than one section, a permanent foundation, and architectural integration with nearby homes.
    • The source labels the 1,400-square-foot living-area requirement as a mandatory standard.

    minimum living area: >= 1400 square feet

    “Manufactured housing may be allowed with the following standards: [...] Include at least 1,400 square feet of living area.”
    One more reviewed finding on this topic
    • Specified — Tiny Homes on Foundation used as a primary dwelling or accessory dwelling unit in unincorporated Washington County.
      “TINY HOME ON FOUNDATION (THOF): A dwelling between one hundred and fifty (150) sq. ft. and one thousand (1,000) sq. ft.”
  • Minimum lot sizeDistrict specific (with conditions)

    Residential development in the applicable unincorporated Washington County zoning district.

    • The applicable minimum lot area depends on the parcel's zoning district; incorporated municipalities may apply their own rules.
    • The county FAQ states that all zones have minimum area requirements.
    • Other legal-lot requirements include access, water, septic feasibility, power, and fire-suppression-plan review as applicable.

    A-5 minimum lot area: 5 acres · A-10 minimum lot area: 10 acres · FR-3.5 minimum lot area: 13500 sq. ft. · R-1-10 minimum lot area: 10000 sq. ft. · R-1-12 minimum lot area: 12000 sq. ft.

    “A-5 | 5 Acres [...] A-10 | 10 Acres [...] FR-3.5 | 13,500 Sq Ft [...] R-1-10 | 10,000 Sq Ft [...] R-1-12 | 12,000 Sq Ft”
    3 more reviewed findings on this topic
    • District specific (with conditions) — Residential and agricultural lots in the Washington County zoning districts listed in the County's official zoning reference.
      “Zoning Reference OST: Open Space Transitional Dist. | 1st | 2nd | Other | Front | Side | Rear | width | Height OS-20 | 20 Acres | N/A | N/A | 25′ | 25′ | 25′ | 400′ | 35′ A: Agricultural Dist. | 1st | 2nd | Other | Front | Side | Rear | width | Height A-5 | 5 Acres | N/A | N/A | 25′ | 25′ | 25′ | 300′ | 35′ A-10 | 10 Acres | N/A | N/A | 25′ | 25′ | 25′ | 400′ | 35′ A-20 | 20 Acres | N/A | N/A | 25′ | 25′ | 25′ | 400′ | 35′ A-40 | 40 Acres | N/A | N/A | 25′ | 25′ | 25′ | 400′ | 35′”
    • District specific (with conditions) — Unincorporated Washington County zoning districts listed in the County Zoning Reference, including agricultural, residential, manufactured-home, and recreational-vehicle-park districts.
      “A-5 | 5 Acres | N/A | N/A | 25′ | 25′ | 25′ | 300′ | 35′ [...] RA-1 | 1 Acres | N/A | N/A | 25′ | 10′ | 10′ | 100′ | 35′ [...] R-1-10 | 10,000 Sq Ft | N/A | N/A | 25′ | 10′ | 10′ | 80′ | 35′”
    • Specified — New residential developments and newly subdivided lots in the Pine Valley Overlay Zone.
      “New residential developments shall have a minimum lot size of one acre. Parcels five (5) acres or more may receive approval of a Planned Development Residential (PDR) allowing 1/4 acre lots or larger to be clustered together with 75% of the lot remaining as open space, or 1/2 acre lots or larger if the open space land is not contiguous.”
  • SetbacksDistrict specific (with conditions)

    Development in unincorporated Washington County zoning districts; setback requirements vary by district and use.

    • The county zoning reference lists front, side, and rear setbacks by zoning district.
    • Accessory dwelling units have a 25-foot minimum setback on all sides.
    • The applicable zoning district and parcel must be verified before relying on a setback value.

    OS-20 front setback: 25 ft · OS-20 side setback: 25 ft · OS-20 rear setback: 25 ft · A-5/A-10/A-20/A-40 front setback: 25 ft · A-5/A-10/A-20/A-40 side setback: 25 ft · A-5/A-10/A-20/A-40 rear setback: 25 ft · RA-1 front setback: 25 ft · RA-1 side and rear setbacks: 10 ft · RA-2.5/RA-5/RA-10 front setback: 25 ft · RA-2.5/RA-5/RA-10 side and rear setbacks: 25 ft · accessory dwelling unit setback on all sides: 25 ft

    “RA-1 | 1 Acres | N/A | N/A | 25′ | 10′ | 10′ | 100′ | 35′ RA-2.5 | 2.5 Acres | N/A | N/A | 25′ | 25′ | 25′ | 250′ | 35′”
    2 more reviewed findings on this topic
    • District specific (with conditions) — Unincorporated Washington County zoning districts listed in the County Zoning Reference and applicable overlay zones.
      “How do I verify my setbacks (Note: All accessory dwelling units have a 25’ minimum setback on all sides)?”
    • District specific (with conditions) — Residential development in the applicable unincorporated Washington County zoning district.
      “A-5 | 5 Acres | N/A | N/A | 25′ | 25′ | 25′ [...] R-1-10 | 10,000 Sq Ft | N/A | N/A | 25′ | 10′ | 10′”
  • Lot coverageDistrict specific (with conditions)

    Lots within the Pine Valley Overlay Zone.

    • The combined square footage of detached accessory structures other than barns is limited to 15% when entirely within the principal-structure setbacks and 10% when located elsewhere.
    • Barns outside Agriculture districts may have up to 25% coverage when incidental to the primary residential use.
    • In Agriculture districts where agricultural uses are operating, barns are permitted without a primary residential use.

    maximum lot coverage: 50 percent (listed Pine Valley Overlay districts) · accessory structure coverage within principal-structure setbacks: <= 15 percent (detached accessory structures other than barns) · accessory structure coverage elsewhere on lot: <= 10 percent (detached accessory structures other than barns) · barn coverage outside Agriculture districts: <= 25 percent (use must be incidental to primary residential use)

    “The combined square footage of all detached accessory structures, with the exception of barns, shall not exceed 15% of the total lot area if the structure is entirely within the setbacks for the principal structure, or 10% of the total lot area if the structure is located elsewhere on the lot. Barns except in Agriculture districts, may have a lot coverage up to 25% so long the use is incidental to the primary residential use.”
    One more reviewed finding on this topic
    • District specific (with conditions) — PDR NHVOZ, PDC NHVOZ, and VC NHVOZ districts in the New Harmony Valley Overlay Zone draft.
      “Maximum Lot Coverage 25% (51% if density bonus is granted) 51%”
  • Building heightDistrict specific (with conditions)

    Unincorporated Washington County zoning districts listed in the County Zoning Reference and applicable overlay zones.

    • The County Zoning Reference lists a 35-foot height limit for the cited agricultural and residential districts.
    • New Harmony Overlay districts have separate height standards.

    A-5 maximum height: <= 35 feet · RA-1 maximum height: <= 35 feet · R-1-10 maximum height: <= 35 feet

    “A-5 | 5 Acres | N/A | N/A | 25′ | 25′ | 25′ | 300′ | 35′ [...] RA-1 | 1 Acres | N/A | N/A | 25′ | 10′ | 10′ | 100′ | 35′ [...] R-1-10 | 10,000 Sq Ft | N/A | N/A | 25′ | 10′ | 10′ | 80′ | 35′”
    One more reviewed finding on this topic
    • District specific (with conditions) — Building height in the Washington County zoning districts listed in the official zoning reference.
      “Zoning Reference OST: Open Space Transitional Dist. | 1st | 2nd | Other | Front | Side | Rear | width | Height OS-20 | 20 Acres | N/A | N/A | 25′ | 25′ | 25′ | 400′ | 35′ A: Agricultural Dist. | 1st | 2nd | Other | Front | Side | Rear | width | Height A-5 | 5 Acres | N/A | N/A | 25′ | 25′ | 25′ | 300′ | 35′ A-10 | 10 Acres | N/A | N/A | 25′ | 25′ | 25′ | 400′ | 35′ A-20 | 20 Acres | N/A | N/A | 25′ | 25′ | 25′ | 400′ | 35′ A-40 | 40 Acres | N/A | N/A | 25′ | 25′ | 25′ | 400′ | 35′”
  • Living in an RVAllowed (with conditions)

    Transient dwelling occupancy of two or more recreational vehicles in a county-regulated recreational vehicle park.

    • A recreational vehicle park may only be approved as a conditional use in the MH Manufactured Housing Park and Recreational Vehicle Park zone.
    • The park must meet Title 10, Chapter 8G requirements.
    • The park must be at least five acres, with maximum density of ten units per gross acre.
    • Each space must be at least 30 feet wide, and RV units must be at least 20 feet apart; the 20-foot separation applies to overnight, extended-stay, and park-model units.
    • Water, sewer, and electricity connections are required; water and sewer plans require Utah Department of Environmental Quality and county public works approval.
    • Waste disposal facilities must be approved by the planning commission and DEQ and comply with subdivision standards.

    minimum park area: >= 5 acres · maximum density: <= 10 units per gross acre · minimum RV-space width: >= 30 feet · minimum distance between RV units: >= 20 feet (Applies to overnight, extended-stay, and park-model units)

    “A Recreational Vehicle Park may only be approved as a conditional use in the MH (Manufactured Housing Park and Recreational Vehicle Park) zone”
  • Manufactured homesLimited

    Manufactured-home development in Washington County zoning areas administered by the County, including the MH manufactured-home zoning classification.

    • The county zoning reference identifies an MH Manufactured Home classification with a density of six units per acre.
    • The MH reference lists a 4,000-square-foot dimensional entry, 25-foot front setback, 10-foot side setback, 10-foot rear setback, 45-foot minimum width, and 35-foot maximum height.
    • Parcel-specific zoning, building-code, utility, septic, and other approvals may also apply.

    density: 6 units/acre · lot or district dimensional entry: 4000 sq ft · front setback: 25 ft · side setback: 10 ft · rear setback: 10 ft · minimum width: 45 ft · maximum height: 35 ft

    “MH: Manufactured Home [...] MH | 6 Units/Acre 4,000Sq Ft | N/A | N/A | 25′ | 10′ | 10′ | 45′ | 35′”
  • Who permits septicLocal (with conditions)

    Septic systems in Washington County within the Southwest Utah Public Health Department district.

    • The Southwest Utah Public Health Department reviews plans, issues permits, conducts inspections, and maintains septic-system records within its district.
    • Washington County septic permits require approval from the Washington County Water Conservancy District or Ash Creek Special Service District.
    “Our department reviews plans, issues permits, conducts inspections, and maintains septic system records within our district.”
  • Septic permitRequired

    Installing, replacing, or modifying an onsite wastewater system in Washington County within the Southwest Utah Public Health Department district.

    • A permit and approved design are required before installing, replacing, or modifying a septic system.
    • A complete application package is required.
    • Soil and percolation testing must be completed by a Utah-certified onsite professional before design or installation.
    • Washington County requires WCWCD or Ash Creek SSD approval.
    “A permit and approved design are required before installing, replacing, or modifying a system.”
  • Septic inspectionRequired

    Septic-system construction in Washington County within the Southwest Utah Public Health Department district.

    • Inspection is required before backfilling.
    • Project information must be kept on-site.
    • The department conducts inspections within its district.
    “Inspection required before backfilling; keep project info on-site. Refer to Utah Code R317-4.”
  • Off-grid sanitationLimited

    Onsite wastewater sanitation systems serving property in Washington County within the Southwest Utah Public Health Department district.

    • Onsite wastewater systems are an allowed wastewater-handling option, but a permit and approved design are required before installation, replacement, or modification.
    • Soil and percolation testing must be completed by a Utah-certified onsite professional before design or installation.
    • Inspection is required before backfilling.
    • Washington County requires WCWCD or Ash Creek SSD approval.
    “A permit and approved design are required before installing, replacing, or modifying a system.”
  • Mandatory utility hookupConditional

    Wastewater disposal for property in Washington County within the Southwest Utah Public Health Department district.

    • Utah law requires wastewater to be handled through either a public sewer connection or an onsite wastewater system.
    • An onsite wastewater system requires a permit and approved design before installation, replacement, or modification.
    • Public water connections require utility documentation confirming service; non-public connections require water rights, water quality, septic setback location, and pressure/flow verification.
    “To help protect public health and the environment, Utah law requires wastewater to be handled through a public sewer connection or an onsite wastewater system (septic system).”
  • Agricultural exemptionAvailable (with conditions)

    Agricultural structures in unincorporated Washington County seeking exemption from building-permit requirements.

    • The proposed structure must be used solely in conjunction with agricultural use; bathrooms, offices, or other human-occupancy areas disqualify the exemption.
    • The property must be larger than 2 acres and in unincorporated Washington County, with zoning of RA 2.5, RE 2.5 or greater, A, OS, OST, or SFR-20.
    • The structure must not be for human occupancy.
    • The structure must be constructed without electrical, plumbing, or other mechanical-code-related work; plumbing, electrical, or mechanical work is not exempt.
    • The structure must meet zoning requirements, including setbacks, building height, and modifying regulations.
    • A setback inspection is required after footing trenches, holes, or pads are dug and before construction.
    • The structure must be 50 feet from any other building containing habitable space.
    • If the use changes from agricultural use, a building permit must be obtained and the building brought into compliance with the current building code.

    minimum property area: > 2 acres (must be unincorporated Washington County) · minimum separation from habitable building: >= 50 feet

    “Is the property larger than 2 acres and within unincorported area of Washington County? (note: Property must be zoned RA 2.5 or RE 2.5 or greater: Zone A, OS, OST, SFR-20)”
    One more reviewed finding on this topic
    • Conditional — Agricultural structures in unincorporated Washington County seeking exemption from adopted building-code permit requirements under Utah Code section 58-56-4.
      “Is the property larger than 2 acres and within unincorported area of Washington County? (note: Property must be zoned RA 2.5 or RE 2.5 or greater: Zone A, OS, OST, SFR-20)”
  • Subdividing landRegulated (with conditions)

    Preliminary plat subdivision applications in unincorporated Washington County.

    • Applications must meet applicable local, state, and federal law.
    • The application deadline is the last Tuesday of each month, with payment received.
    • All applications are reviewed at the Joint Utility Department Staff Meeting, and no application proceeds until staff approval.
    • Applicants must submit completed application materials, applicable fees, proof of ownership, zoning compliance for each proposed parcel, a legal description, and a preliminary plat prepared and wet-stamped by a licensed surveyor or engineer.
    • After staff acceptance, the application proceeds to the Planning Commission; the Planning Commission is the land-use authority for the application.

    application deadline: last Tuesday of each month (Completed application and payment must be received) · preliminary plat review meeting: first Tuesday of each month at 9:30 a.m. (Only after Community Development completeness review and acceptance) · Planning Commission meeting: second Tuesday of each month at 1:30 p.m. (If approved at the Joint Utility Development Staff Meeting and no additional information is needed)

    “All Preliminary Plat Applications must meet the applicable requirements of local, state and federal law. Deadline for applications is the last Tuesday of each month – completed with payment received. All applications must be reviewed at the Joint Utility Department Staff Meeting. No application will move forward until approved at Staff level.”
    2 more reviewed findings on this topic
    • Regulated (with conditions) — Preliminary subdivision plats in unincorporated Washington County.
      “All Preliminary Plat Applications must meet the applicable requirements of local, state and federal law.”
    • Regulated (with conditions) — Creation or modification of lots in Washington County, especially determining whether an existing parcel is a legal building lot.
      “Was my lot created or modified after July 1st 1992 (subdivision ordinance date)? Does my lot acreage meet the minimum requirement of the zone (all zones have minimum area requirements)? Do I have approved access (public road, private road, or perpetual ingress/egress easement 25’ minimum width)?”
  • Driveway accessLimited

    Residential and commercial developments subject to Washington County Construction Design Standards.

    • The number of improved accesses depends on forecasted traffic volumes.
    • Adjacent developments may be required to combine or share driveway access to public roads.
    • Access must have proper width for calculated traffic volumes and expected vehicle types at full development.
    • Access must comply with the Zoning Ordinance and applicable traffic-impact-study criteria.
    • Direct access for parking, loading, or driveway areas requiring backing maneuvers onto major collector or higher-order streets is not allowed.
    • Covered driveways are not allowed unless approved by the County representative.

    improved accesses: >= 2 accesses (generally required, depending upon forecasted traffic volumes)

    “Adjacent developments may be required to combine or share driveway access to public roadways.”
  • Building in a floodplainRequired

    Development in or adjacent to FEMA-designated, mapped, or other flood plains and natural watercourses subject to Washington County standards.

    • Work in and around FEMA-designated and mapped flood plains must refer to the local ordinance governing use.
    • Building floor levels should generally be two feet above the 100-year flood water level.
    • Encroachments into the 100-year flood plain for natural watercourses require County approval.
    • Floodplain alteration requires showing no significant negative influence on flood conveyance, floodplain water level, or the alteration itself.
    • Developments adjacent to flood plains may require hydrologic, hydraulic, erosion, and geomorphologic studies.
    • The floodplain permit checklist may require maps/plans, elevation or floodproofing certificates, grading plans, no-rise certification, Zone A hydraulic/hydrology modeling, CLOMR, wetland permit, and copies of federal, state, and local permits.
    • A project involving an addition, remodel, or alteration valued at 50% or more of the structure's pre-work value is treated as substantially improved and must comply with the relevant Floodplain Damage Prevention Ordinance.
    • A relocated structure, including mobile, manufactured, or cabin structures, is treated as new construction.

    recommended floor elevation: >= 2 feet above 100-year flood water level (general standard; subject to applicable ordinance) · substantial improvement threshold: >= 50 percent of pre-work structure value (addition, remodel, or alteration)

    “No work may start until a permit has been issued.”
  • Short-term rentalsLimited

    Short-term rentals in unincorporated Washington County; incorporated municipalities may have separate rules.

    • A valid Washington County Short-Term Rental License is required.
    • A short-term rental is transient lodging offered for 29 consecutive calendar days or less for compensation or other consideration.
    • The ordinance was adopted in October 2021.
    • Licenses must be renewed annually.
    • Processing after a completed application takes 10-14 business days.
    • The procedures require an owner-occupied primary residential exemption application, completed business-license application, current building-code compliance, and possibly a County health and safety check.
    • The existing-dwelling application fee is $160 and includes a health and safety check, which may be waived if the dwelling is under construction and following building-permit processes and inspections.
    • The applicant must provide a site plan, septic permit, applicable dwelling photos, proof of insurance with a landlord endorsement, and display the required good-neighbor materials and licenses.

    maximum occupancy term: <= 29 consecutive calendar days (offered for compensation or other consideration) · license processing time: 10-14 business days (after completed application) · existing dwelling application fee: 160 USD (includes health and safety check)

    “A valid Washington County Short-Term Rental License is required for all Short-Term Rentals in the unincorporated areas of the County.”
  • Permit feesPublished (with conditions)

    Washington County Community Development land-use applications and building-related permits in unincorporated Washington County.

    • Building permit fees are based on total valuation.
    • A 1% state surcharge is added to the building permit fee.
    • Manufactured home valuation is $40.00 per square foot and the manufactured home permit fee is $400.00.
    • Special inspections are $100.00 and pool permits are $300.00.
    • Inspection, re-inspection, additional plan-review, and outside-consultant charges may apply; hourly charges are $100.00 per hour or the total hourly cost to the jurisdiction, whichever is greatest.
    • Non-refundable deposits may be exceeded and the Land Use Department bills monthly once exceeded.
    • Amendments require the same non-refundable fee as the original process.

    conditional use permit, staff review: 150 USD (non-refundable) · conditional use permit, commission review: 300 USD (non-refundable) · variance: 250 USD (non-refundable) · zone change: 400 USD (non-refundable) · subdivision / PD combined process: 900 USD (non-refundable) · state surcharge: 1 percent of building permit · building permit fee for valuation $1 to $500: 23.5 USD · manufactured home permit fee: 400 USD

    “Building Permit | Square feet x average cost = valuation (see below) State Surcharge | 1% of Building Permit”
  • Permit processPublished (with conditions)

    Residential and commercial building permit applications and inspections administered by Washington County Community Development in unincorporated Washington County.

    • Applications are accepted electronically through the county's online permitting software.
    • After receipt, the system sends a link to check application status.
    • Twenty-four-hour notice is required after work is completed and ready for inspection.
    • A permit number is required when scheduling an inspection.
    • A four-yard capacity dumpster with lid or cover must be located at the building site during all phases of construction and serviced regularly.
    • A sanitary facility must be maintained at each construction site until completion or alternative facilities are available.

    inspection notice: >= 24 hours (after work is completed and ready for inspection)

    “The Community Development Department only accepts building permit applications electronically through our online permitting software system.”

Utah rules that apply here

  • Owner-builder exemptionAvailable (with conditions)

    A sole owner acting as an owner-builder for residential construction on the owner's property, concerning exemption from contractor licensure under the Utah Construction Trades Licensing Act; this does not by itself eliminate applicable building-permit, inspection, or code requirements.

    • The sole owner may build no more than one residential structure per year on the owner's property and no more than three residential structures per five years.
    • The use must be the sole owner's noncommercial, nonpublic use.
    • A person other than the property owner or the specified volunteer exemption persons who engages in building the residential structure must be licensed if otherwise required by the chapter.
    • Incidental structures such as a shed, carport, or detached garage are covered when for the sole owner's noncommercial, nonpublic use.
    • For persons working under the owner, work must be without compensation other than qualifying token compensation and under the direction of the property owner.
    • Token compensation must be minimal compared with fair market value, unrelated to fair market value, and incidental, including meals, refreshments, or reasonable transportation costs.

    residential structures per year: <= 1 structure (For the sole owner's property and sole owner's noncommercial, nonpublic use.) · residential structures per five years: <= 3 structures (For the sole owner's property and sole owner's noncommercial, nonpublic use.)

    “a sole owner of property engaged in building: (i) no more than one residential structure per year on the sole owner's property and no more than three residential structures per five years on the sole owner's property for the sole owner's noncommercial, nonpublic use”
    One more reviewed finding on this topic
    • Conditional — A sole owner constructing a residential structure or incidental residential structures on the owner's property in Washington County for noncommercial, nonpublic use.
      “a sole owner of property engaged in building: (i) no more than one residential structure per year on the sole owner's property and no more than three residential structures per five years on the sole owner's property for the sole owner's noncommercial, nonpublic use”
  • Building code adoptedAdopted (with conditions)

    Building construction, alteration, remodeling, and repair, and regulation of those activities throughout Utah, subject to the State Construction Code's statewide and local amendments and statutory exceptions.

    • The code version cited is effective July 1, 2026 and is superseded January 1, 2027.
    • The adopted codes operate together with Chapter 3 statewide amendments and Chapter 4 local amendments incorporated into the State Construction Code.
    • Compliance is required when new construction is involved.
    • For an existing building, compliance is required when the owner or agent voluntarily undertakes repair, renovation, remodeling, alteration, enlargement, rehabilitation, conservation, or reconstruction, or changes the character or use in a way that increases occupancy loads, other demands, or safety risks.
    • The 2006 Utah Wildland Urban Interface Code may be adopted by a local compliance agency by local ordinance or similar action as a local amendment.
    • Historic-property plaster standards apply only when the owner receives a government tax subsidy based on historic status, the property is wholly or partially funded by public money, or the property is owned by a government entity.

    International Building Code edition: 2024, including Appendices C and J · International Residential Code edition: 2021, including Appendix AQ · International Plumbing Code edition: 2024 · International Mechanical Code edition: 2024 · International Fuel Gas Code edition: 2024 · National Electrical Code edition: 2023 · International Energy Conservation Code edition: 2024 · International Existing Building Code edition: 2024 · effective date: 2026-07-01 · superseded date: 2027-01-01

    “the following construction codes are incorporated by reference [...] (a) the 2024 edition of the International Building Code, including Appendices C and J”
    One more reviewed finding on this topic
    • Adopted (with conditions) — Construction, alteration, remodeling, repair, and regulation of building construction in Washington County under Utah's State Construction Code.
      “Effective 7/1/2026 Superseded 1/1/2027 15A-2-103 Specific editions adopted of construction code of a nationally recognized code authority. (1) Subject to the other provisions of this part, the following construction codes are incorporated by reference, and together with the amendments specified in Chapter 3, Statewide Amendments Incorporated as Part of State Construction Code, and Chapter 4, Local Amendments Incorporated as Part of State Construction Code, are the construction standards to be applied to building construction, alteration, remodeling, and repair, and in the regulation of building construction, alteration, remodeling, and repair in the state:”
  • Certificate of occupancyLimited

    Building permit applicants in Washington County who use the statutory third-party inspection process.

    • The applicant must first submit a request for inspection.
    • The third-party inspection firm must be on the local regulator's approved list.
    • The third-party inspection firm must complete the inspection and submit its inspection report to the local regulator.
    • The local regulator must promptly issue the certificate of occupancy or letter of completion after receiving the final inspection report.
    • The cited provision establishes this certificate-of-occupancy issuance route and does not establish that every project requires a certificate.
    “The local regulator shall issue a certificate of occupancy to the building permit applicant if the third-party inspection firm: (i) completes the inspection; and (ii) submits the inspection report to the local regulator.”
    One more reviewed finding on this topic
    • Limited — Structures for which a certificate of occupancy is required by Utah Code § 15A-1-204.
      “"Completed noncompliant structure" means a structure that was constructed and completed without: (i) obtaining a building permit; (ii) passing inspections; or (iii) obtaining a certificate of occupancy as required by Section 15A-1-204.”
  • Zoning districtsPartial

    County zoning districts and county land-use regulations in Utah, including unincorporated county areas.

    • A county must publish all of its land-use regulations on its website or by linking to a separate webpage or third-party website.
    • The state statute requires publication of county land-use regulations but does not itself list the actual zoning districts or boundaries.
    • County land-use regulations may apply to all or part of the unincorporated county area or to a designated mountainous planning district.
    “A county shall publish on the county's website: (i) all of the county's land use regulations; and (ii) a fee schedule that lists all of the county's fees related to a land use application, land use permit, or land use regulation, including development review fees and impact fees.”
  • Accessory dwellingsLimited

    One internal accessory dwelling unit within a primary dwelling in county areas of Utah zoned primarily for residential use.

    • The unit must be an internal accessory dwelling unit within a primary dwelling and the area must be zoned primarily for residential use.
    • The unit must comply with all applicable building, health, and fire codes.
    • A county may prohibit a separate utility meter; require the unit not to change the appearance of the primary dwelling as a single-family dwelling; and require one additional on-site parking space, except when the county land use ordinance requires four off-street parking spaces. Garage or carport parking spaces converted to habitable space must be replaced.
    • A county may prohibit an internal accessory dwelling unit within a mobile home; require a permit or license for renting it; prohibit units in a zoning district covering an area equivalent to 25% or less of the total unincorporated area zoned primarily for residential use, except that newly constructed units with final plat approval dated on or after October 1, 2021, and complying with applicable land use regulations may not be prohibited; prohibit units served by a failing septic tank; prohibit units on lots of 6,000 square feet or less; prohibit rental for fewer than 30 consecutive days; and prohibit rental when the dwelling is not occupied as the owner's primary residence.
    • A county may hold a lien and record an accessory-dwelling-unit notice under the procedures in § 17-80-303(4)-(5).
    • This claim does not determine additional municipality-specific ordinances under Utah's municipal land-use statute.

    minimum rental period: >= 30 consecutive days · small-lot threshold: <= 6000 square feet (A county may prohibit creation at or below this lot size) · restricted county residential zoning area: <= 25 percent of total unincorporated residentially zoned area (Newly constructed units with final plat approval dated on or after October 1, 2021 and compliance with applicable land use regulations may not be prohibited) · additional parking: 1 on-site space (Not permitted if the county land use ordinance requires four off-street parking spaces)

    “In any area zoned primarily for residential use: (a) the use of an internal accessory dwelling unit is a permitted use;”
  • Well permitRequired

    Construction of shallow water wells in Utah.

    • The owner must have a valid water right to beneficially use groundwater before construction.
    • A Start Card is issued upon approval of the water right and is described as essentially the permit to construct the well.
    • Shallow water wells must be constructed by a licensed well driller or licensed shallow water well constructor.
    • The licensee must obtain the Start Card and file it with the Division before constructing or working on the shallow water well.
    • The source does not establish the same Start Card mechanism for every other regulated-well category.
    “A Start Card is issued upon approval of the water right, which is essentially the permit to construct the well.”
    One more reviewed finding on this topic
    • Required — Water wells in Washington County, including shallow water wells regulated under Utah's statewide water-well requirements.
      “A shallow water well owner must have a valid water right to beneficially use groundwater from a shallow water well prior to well construction.”
  • Campground & park staysLimited

    Tiny houses in Utah RV parks; the state source also states that tiny-home permission in a particular area depends on local land-use regulations.

    • The tiny house may be allowed in an RV park only with the required data plate or permanent label and either Recreational Vehicle Industry Association certification or qualified third-party inspection certification.
    • The RV park must comply with applicable building, zoning, electrical, health, fire codes and local ordinances.
    • Outside RV parks, whether a tiny home is permitted depends on local land-use regulations and whether the structure is treated as a primary dwelling, accessory dwelling, modular unit, or manufactured home.

    maximum floor area for tiny house under Rule R392-301: <= 400 square feet (The rule defines tiny house for purposes of the rule; this does not establish statewide land-use permission outside RV parks.)

    “A recreational vehicle or a tiny house may be allowed in a recreational vehicle park only if:”
    One more reviewed finding on this topic
  • county zoning authorityGeneral

    Utah counties may enact land-use controls, including zoning ordinances, for land in unincorporated areas statewide.

    • The authority is subject to Utah Code Section 17-79-101(4) and Section 11-41-103.
    • The statutory grant expressly covers the unincorporated area of a county and a designated mountainous planning district.
    • The quoted provision lists uses, density, open spaces, structures, and buildings among the subjects of permissible land-use controls.
    “Subject to Subsection (4) and Section 11-41-103, to accomplish the purposes of this chapter, a county may enact all ordinances, resolutions, and rules and may enter into other forms of land use controls and development agreements that the county considers necessary or appropriate for the use and development of land within the unincorporated area of the county or a designated mountainous planning district”
  • county building authorityGeneral

    Utah counties may adopt and enforce building regulations and require building permits for construction in unincorporated areas statewide.

    • The general county building-regulation authority applies outside the limits of cities and towns.
    • Local regulations may not conflict with general laws.
    • Under Utah Code Section 17-79-901, erecting, constructing, reconstructing, altering, or changing the use of a building or other structure within a county requires approval of a building permit.
    • A county may not issue a building permit unless the plans fully conform to regulations then in effect.
    • The county permit authority is subject to the State Construction and Fire Codes Act and other statutory limitations.
    “A county may make and enforce within the limits of the county, outside the limits of cities and towns, all local, police, building, and sanitary regulations that are not in conflict with general laws.”

Still unanswered

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

  • Camping on your land — Temporary camping on private land in unincorporated Washington County.
  • Tiny homes — Tiny-home occupancy as a residential dwelling in unincorporated Washington County.

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 Washington County

Whether a new home can legally get its own water here — the sub-state groundwater regime, from Utah’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 wellPermit required — restricted

Utah has NO exempt domestic well — you must own a water right to drill any well, including a household well. In an open area you file a new appropriation, but because much of Utah is closed to new appropriation a newcomer typically must PURCHASE an existing water right and file a change application to move it to the new well.

Limit: ~0.45 acre-ft/yr indoor domestic (typical allocation); no statutory exempt-well quantity

Utah Division of Water Rights — FAQ ↗
  • Groundwater Management Plan valleys (Cache, Tooele, Salt Lake, Utah, Juab, Pahvant, Snyderville, Sand Hollow, Weber Delta)majority of county

    Populated valleys managed under groundwater management plans that protect existing rights and cap withdrawals; new groundwater use requires acquiring and changing existing water rights rather than new appropriation.

    Utah Division of Water Rights — Groundwater Management Plans ↗

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 Utah state water agency before you buy or drill.Groundwater governance as of Jul 2026, cited to each administering agency.

Living off-grid in Washington County, Utah

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

Washington County scores 42/100 on the Bolthole Index, a marginal county profile. Its strengths: deep seclusion — about 3,523 people within 15 miles and manageable long-term carry cost. Watch-outs: thin water margin (15.2″/yr rainfall) and elevated mid-century heat, water, rain, or wildfire exposure.

Do you need a building permit in Washington County, Utah?

Washington County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Southwest Utah Public Health Department. 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.

How much does land cost in Washington County, Utah?

Land in Washington County runs about $8,684 per acre, based on the latest county data.

What is the water situation in Washington County?

Washington County gets about 15.2" of rain a year, with severe drought in roughly 26.3% of years. On water rights, Washington County lies in the Groundwater Management Plan valleys (Cache, Tooele, Salt Lake, Utah, Juab, Pahvant, Snyderville, Sand Hollow, Weber Delta) — Populated valleys managed under groundwater management plans that protect existing rights and cap withdrawals; new groundwater use requires acquiring and changing existing water rights rather than new appropriation..

How remote is Washington County?

A typical private-land location has about 3,523 people within 15 miles and 207,544 within 100 miles. These radius catchments are the published fallback where road routing is unavailable.

How Washington compares in Utah

Compare side-by-side →See all 29 Utah counties ranked →