Building permits, zoning and land rules 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 demolished¹. Buildings for a legitimate agricultural use, as the Building Official determines, carry no permit charge¹. 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 amendments¹¹. 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 apply¹².

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.

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 district^2,6. 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 law¹³. 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 RA¹⁴. Side and rear setbacks are 10 feet in the A zone, 60 feet in GRF-20S and GRF-20R, and 5 feet in RA¹⁴. 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 development¹⁴. We could not confirm minimum dwelling size, lot coverage or building height, so ask the Building / Planning / Zoning Department^2,3. 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 zones¹⁵. 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 impose¹⁶.

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 permit^4,17. 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 contract⁴. The 2026 fees are $600 for a conventional system, $900 for an alternative system and $200 for a repair or replacement⁴. 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 first¹⁸. 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 detail¹⁰. Call the Richfield office at (435) 896-5451¹⁹.

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 damage²⁰. Recreational property in that zone is for camping, travel or seasonal use, not as a primary dwelling²¹. We could not confirm a rule addressing tiny homes by that name, so ask county zoning how the proposed unit will be classified^2,3. 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 requirements⁹.

1. Ask the Building / Planning / Zoning Department to identify the parcel's zoning district and confirm the use, area and siting standards that apply^3,6.
2. Confirm that the parcel and any planned split comply with Sevier County zoning and subdivision rules¹³.
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 design^4,18.
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 use⁷.
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 connection²².
7. If the parcel is in a mapped flood hazard area, apply to the Floodplain Administrator for a floodplain development permit on county forms²³.
8. Schedule the county's required building inspections through its online portal³.

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 less¹⁰. Conventional septic suitability is limited on most mapped soils, with only about 7.9% rated without severe drain-field limitations¹⁰. 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 source¹⁰. 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 cleared^3,22. Development in a flood hazard area needs a county floodplain development permit²³. Wells need a state water right and a Start Card from the Utah Division of Water Rights before construction²⁴. The effective property-tax rate is about 0.6%, with a median annual bill near $1,513¹⁰.