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

At a glance

Building permit

Required for buildings larger than 120 square feet in unincorporated Sevier County¹

Zoning

Yes; each zoning district has its own use, intensity and area standards⁶⁷

Septic permit

Required before construction; issued by Central Utah Public Health Department⁴⁸

Owner-builder

A conditional exemption from contractor licensing is available for an owner's noncommercial, nonpublic residential project⁹

RV living

Long-term residence is limited to approved mobile-home or RV parks; temporary placement requires a permit⁵

Tiny home

Private-land occupancy depends on the parcel's zoning and building-code treatment²¹⁰

Manufactured home

Allowed where a single-family residence is permitted if foundation, code and local land-use requirements are met¹¹

Septic soil difficulty

Only about 7.9% of soils lack severe limits for a conventional drain field¹²

Who to call

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

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

Yes. Unincorporated Sevier County requires a building permit before a building larger than 120 square feet is erected, altered, moved or demolished¹³. Buildings for a legitimate agricultural use, as the Building Official determines, carry no permit charge¹³. The county's permit page also warns that starting required work without a permit adds an investigation fee equal to the permit fee³. Utah's current statewide construction standards include the 2024 International Building Code and the 2021 International Residential Code, together with state and local amendments¹⁴. A farm structure used only for agriculture and not for human occupancy may qualify for a State Construction Code exemption, but plumbing, electrical or mechanical work can still require permits, and acreage and location exceptions apply¹⁵.

Who handles Sevier County building permits and inspections?

The Sevier County Building / Planning / Zoning Department oversees residential and commercial permit rules, fees and inspections³. Reach the department at (435) 893-0420 or visit 250 N. Main St. Suite 131, Richfield, UT 84701³. The county provides one online portal for both building-permit applications and inspection scheduling³. For a project inside a city or town, obtain the municipality's zoning approval before applying for the county building permit; a new residence in an unincorporated area uses the county's unincorporated-area signature sheet³. Permit fees can change, so the county directs applicants to call the department for the current amount³.

Does Sevier County have zoning?

Yes. Sevier County is divided into zoning districts that govern land use, intensity and area requirements, and development must comply with the standards of the parcel's district⁶⁷. Contiguous land in common ownership is treated as one undivided parcel for zoning and subdivision purposes, and no portion may be sold or developed unless it conforms to zoning and subdivision law¹⁶. Setbacks and lot size depend on the district. Front setbacks run 30 feet in the A zone, 60 feet in GRF-20S and GRF-20R, and 30 feet in RA¹⁷. Side and rear setbacks are 10 feet in the A zone, 60 feet in GRF-20S and GRF-20R, and 5 feet in RA¹⁷. Density is one dwelling per 20 acres in GRF-20S and GRF-20R and one per half acre in RA, while the A zone lot size depends on a figure in the ordinance and on water and septic protection zones that Central Utah Public Health must review before the county approves development¹⁸¹⁷. We could not confirm minimum dwelling size, lot coverage or building height, so ask the Building / Planning / Zoning Department²³. An internal accessory dwelling unit inside a single-family home is allowed only on residential lots of 21,780 square feet (half an acre) or more, and not in commercial, industrial or GRF-20S zones¹⁹. One internal accessory dwelling unit is a permitted use in an area zoned primarily for residential use, subject to building, health and fire codes and the restrictions Utah law allows the county to impose²⁰.

How do septic permits work in Sevier County?

Central Utah Public Health Department issues onsite wastewater permits in Sevier County, and no portion of a septic system may be built until the department issues the construction permit²¹⁸. A complete submittal includes the application, soil classification, site plan, system design and nonrefundable fee; an alternative system also needs an operation and maintenance plan or contract⁸. The 2026 fees are $600 for a conventional system, $900 for an alternative system and $200 for a repair or replacement⁸. Before a building permit issues, the county needs a letter of approval from Central Utah Public Health, and land within 300 feet of an existing public wastewater line must request a sewer hookup first²². Only about 7.9% of county soils are rated without severe limitations for a conventional drain field, so make septic evaluation an early contingency rather than a post-purchase detail¹². Call the Richfield office at (435) 896-5451²³.

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

Sevier County limits mobile homes and RVs used as long-term residences to approved mobile-home or RV parks; temporary placement elsewhere requires a temporary-use permit⁵. In the GRF-20S zone, no more than two RVs may be permanently placed on a parcel, and permanent units must connect to a state-approved septic system and be protected from weather damage²⁴. Recreational property in that zone is for camping, travel or seasonal use, not as a primary dwelling²⁵. We could not confirm a rule addressing tiny homes by that name, so ask county zoning how the proposed unit will be classified²³. A manufactured home is allowed where a single-family residence is permitted if it has a compliant permanent foundation and meets the zone's building-code, subdivision and applicable covenant requirements¹¹.

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

1. Ask the Building / Planning / Zoning Department to identify the parcel's zoning district and confirm the use, area and siting standards that apply⁷³.
2. Confirm that the parcel and any planned split comply with Sevier County zoning and subdivision rules¹⁶.
3. Start the septic review (and, if a public sewer line is within 300 feet, request the hookup) with Central Utah Public Health Department using a soil classification, site plan and system design⁸²².
4. If acting as your own contractor, confirm the Utah owner-builder exemption applies; it is limited to one residential structure per year and three per five years for the owner's noncommercial, nonpublic use⁹.
5. Submit the county building-permit application online and obtain any required zoning approval first³.
6. If the driveway connects to a state highway, complete UDOT's conditional-access-permit process before constructing the connection²⁶.
7. If the parcel is in a mapped flood hazard area, apply to the Floodplain Administrator for a floodplain development permit on county forms²⁷.
8. Schedule the county's required building inspections through its online portal³.

What should you check before buying land in Sevier County?

Start with buildable acreage, access and water rather than the gross parcel size: about 77.1% of Sevier County is federal land, and only about 38.9% of county land has a slope of 15% or less²⁸²⁹. Conventional septic suitability is limited on most mapped soils, with only about 7.9% rated without severe drain-field limitations¹². Sevier County averages about 16.4 inches of precipitation a year and has experienced severe drought in about 34% of years, so verify the parcel's lawful and dependable water source³⁰³¹. A driveway onto a state highway needs UDOT review, while we could not confirm the county-road access process, so ask the county department before treating it as cleared²⁶³. Development in a flood hazard area needs a county floodplain development permit²⁷. Wells need a state water right and a Start Card from the Utah Division of Water Rights before construction³². The effective property-tax rate is about 0.6%, with a median annual bill near $1,513³³³⁴.

Watch-outs

• Starting work before obtaining a required Sevier County building permit can add an investigation fee equal to the permit fee, effectively doubling that fee³.
• Sevier County zoning standards vary by district, and we could not confirm minimum dwelling size, lot coverage or building height; get the parcel's standards from Building / Planning / Zoning²³.
• Only about 7.9% of Sevier County soils are rated without severe limitations for a conventional septic drain field, so obtain the soil classification and health-department review early¹²⁸.
• Do not treat a GRF-20S recreational parcel as a homesite: camping is limited to recreational, travel or seasonal use and cannot be a primary dwelling²⁵.

Sources

1. § 150.20 Building permit required for all buildings (2026 county census)
2. Planning and Zoning (2026 county census)
3. Sevier County Building / Planning / Zoning Department (sevier.utah.gov)
4. Central Utah Public Health Department - Onsite Wastewater Permit (2026 county census)
5. Sevier County Code § 154.220 Mobile Homes, quoted and re-checked
6. Planning and Zoning, quoted and re-checked
7. § 154.071 Zones Designated, quoted and re-checked
8. Onsite Wastewater Permit Instructions, quoted and re-checked
9. Utah Code Title 58, Chapter 55 compilation — Section 58-55-305, quoted and re-checked
10. OPRO Accessory Dwellings (ADU's) and other dwelling types (Utah statewide rule), quoted and re-checked
11. Sevier County Code § 154.221 Manufactured Homes, quoted and re-checked
12. 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
13. § 150.20 Building permit required for all buildings, quoted and re-checked
14. Utah Code § 15A-2-103, Specific editions adopted of construction code, quoted and re-checked
15. Utah Code § 15A-1-204 (Utah statewide rule), quoted and re-checked
16. Planning and Zoning, quoted and re-checked
17. Planning and Zoning, quoted and re-checked
18. § 153.122 Lot Size Standards, quoted and re-checked
19. Sevier County Code § 154.287 Allowed Zones, quoted and re-checked
20. Utah Code § 17-80-303, Internal accessory dwelling units, quoted and re-checked
21. Local Health Departments and District Engineers, quoted and re-checked
22. Sevier County Municipal Code, Title 14, Chapter 14.52, quoted and re-checked
23. Central Utah Public Health Department, Richfield Office (centralutahhealth.gov)
24. Sevier County Code § 154.156 Recreational Vehicles, quoted and re-checked
25. Sevier County Code § 154.155 Purpose, quoted and re-checked
26. Conditional Access Permit (Utah statewide rule), quoted and re-checked
27. § 151.08 Development Permit Established, quoted and re-checked
28. Federal land share: Bolthole Index county data
29. Share of land at 15% slope or less: Bolthole Index county data
30. Annual precipitation: Bolthole Index county data
31. Share of years in severe drought: Bolthole Index county data
32. Water Well Drilling Information, quoted and re-checked
33. Effective property tax rate: Bolthole Index county data
34. Median property tax bill: Bolthole Index county data

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.