Unincorporated Sevier County, Utah requires a building permit for buildings larger than 120 square feet, and county zoning controls what may be built on each parcel12. The Sevier County Building / Planning / Zoning Department handles permits and inspections, while Central Utah Public Health Department issues septic permits34. Confirm the parcel's zoning and septic feasibility before committing to a house plan.
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 standards56
- Septic permit
- Required before construction; issued by Central Utah Public Health Department47
- Owner-builder
- A conditional exemption from contractor licensing is available for an owner's noncommercial, nonpublic residential project8
- RV living
- Not confirmed for private land; ask county zoning before relying on it2
- Tiny home
- Private-land occupancy depends on the parcel's zoning and building-code treatment29
- Manufactured home
- Allowed where a single-family residence is permitted if foundation, code and local land-use requirements are met10
- Septic soil difficulty
- Only about 7.9% of soils lack severe limits for a conventional drain field11
Who to call
Building permits
Sevier County Building / Planning / Zoning Department
Building permits, inspections, planning, zoning and subdivision ordinances for Sevier County
250 N. Main St. Suite 131, Richfield, UT 84701
Septic permits
Central Utah Public Health Department, Richfield Office
Onsite wastewater permit applications and environmental health questions for Sevier County
70 Westview Dr., Richfield, Utah
Contact details are copied from each office’s official page and were checked against it on September 27, 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 demolished1. 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 amendments12. 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 apply13.
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 district56. That means there is no single countywide answer for setbacks, minimum lot size, minimum dwelling size, lot coverage or building height; we could not confirm those measurements, so ask the Building / Planning / Zoning Department for the parcel's district and applicable standards23. Planning and Zoning meetings occur on the second Wednesday of each month, subject to holiday rescheduling, and paperwork is due by the third Friday at 3:00 p.m. for the next month's agenda14.
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 permit157. 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 contract7. The 2026 fees are $600 for a conventional system, $900 for an alternative system and $200 for a repair or replacement7. 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 detail11. Call the Richfield office at (435) 896-545116.
Can you live in an RV or tiny home on land in Sevier County?
We could not confirm a Sevier County rule allowing long-term RV residence or temporary camping on private land, so ask county zoning about the specific parcel before buying or moving an RV onto it23. Utah's sanitation rule for RV parks does not answer whether someone may occupy an RV on an individual private parcel17. Tiny-house permission outside an RV park likewise depends on local land-use rules and whether the unit is treated as a primary dwelling, accessory dwelling, modular unit or manufactured home9. A manufactured home cannot be excluded from a zone that permits single-family residences if it meets permanent-foundation, building-code, local land-use and covenant requirements10.
Building a home in Sevier County: the steps, in order
- Ask the Building / Planning / Zoning Department to identify the parcel's zoning district and confirm the use, area and siting standards that apply63.
- Start the septic review with Central Utah Public Health Department using a soil classification, site plan and system design7.
- 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 use8.
- Submit the county building-permit application online and obtain any required zoning approval first3.
- If the driveway connects to a state highway, complete UDOT's conditional-access-permit process before constructing the connection18.
- 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 less1920. Conventional septic suitability is limited on most mapped soils, with only about 7.9% rated without severe drain-field limitations11. 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 source2122. A driveway onto a state highway needs UDOT review, while we could not confirm the county-road access process or the county's floodplain-development trigger; ask the county department before treating either issue as cleared183. The effective property-tax rate is about 0.6%, with a median annual bill near $1,5132324.
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 countywide numbers for setbacks, lot size, dwelling size, lot coverage or 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 early117.
Sources
- Sevier County Code 150.20 - Building Permit Required for All Buildings (2026 county census)
- Planning and Zoning (2026 county census)
- Sevier County Building / Planning / Zoning Department (sevier.utah.gov)
- Central Utah Public Health Department - Onsite Wastewater Permit (2026 county census)
- Planning and Zoning, quoted and re-checked
- Planning and Zoning, quoted and re-checked
- Onsite Wastewater Permit Instructions, quoted and re-checked
- Utah Code Title 58, Chapter 55 compilation — Section 58-55-305, quoted and re-checked
- OPRO Accessory Dwellings (ADU's) and other dwelling types (Utah statewide rule), quoted and re-checked
- Utah Code § 17-80-302, Manufactured homes, quoted and re-checked
- Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
- Utah Code § 15A-2-103, Specific editions adopted of construction code, quoted and re-checked
- Utah Code § 15A-1-204 (Utah statewide rule), quoted and re-checked
- Planning and Zoning, quoted and re-checked
- Local Health Departments and District Engineers, quoted and re-checked
- Central Utah Public Health Department, Richfield Office (centralutahhealth.gov)
- Utah Administrative Code Rule R392-301, Recreational Vehicle Parks (Utah statewide rule), quoted and re-checked
- Conditional Access Permit (Utah statewide rule), quoted and re-checked
- Federal land share: Bolthole Index county data
- Share of land at 15% slope or less: Bolthole Index county data
- Annual precipitation: Bolthole Index county data
- Share of years in severe drought: Bolthole Index county data
- Effective property tax rate: Bolthole Index county data
- Median property tax bill: Bolthole Index county data
Written September 27, 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.