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

Unincorporated Summit County requires a building permit for construction, enlargement, alteration, repair, movement, improvement, removal, conversion or demolition of a building or structure, including solar installations¹. The county lists exceptions for commercial accessory buildings smaller than 120 square feet, residential accessory buildings smaller than 200 square feet, certain agricultural buildings and fences below 7 feet, but it does not define every agricultural building that qualifies¹. A qualifying agricultural structure must be used only for agriculture and not for human occupancy, and the exemption does not remove zoning, setback or height obligations¹⁰.

Utah's statewide construction standards apply to building construction, alteration, remodeling and repair, including the adopted 2024 International Building Code subject to statewide and local amendments¹¹. Building-permit projects are inspected, and the county says its mandatory inspection sequence may be supplemented for a particular job¹².

For unincorporated land, the Summit County Building Department handles building permits, plan review and inspections¹. The county processes all building-permit submissions, reviews and issuance through EPROCESS 360; it does not accept paper plans or provide over-the-counter reviews¹. Required checklist documents must accompany the application, and incomplete packages are rejected for resubmission¹.

Start with the Summit County Planning Department because some projects need a separate planning approval before the building application¹. Permit costs are project-specific: certain developments may owe transportation impact fees, and applicability is decided during building-permit review rather than by one uniform amount¹. For new construction, final Building and Engineering approvals are required before a certificate of occupancy can be issued, along with other applicable agency approvals¹³.

Inside Park City, the city handles building permits¹⁴. Coalville requires a city installation permit for recreational park trailers; that requirement does not establish the city's building-permit rules for every structure¹⁵. Septic permitting remains with the Summit County Health Department³.

Unincorporated Summit County has county-administered zoning under separate development codes: Snyderville Basin around Park City, and Eastern Summit County around Henefer, Coalville, Oakley, Kamas and Francis². Inside city limits, Park City, Kamas, Oakley and Coalville administer their own zoning^16,17,18,19. Septic approval remains with the Summit County Health Department³.

Eastern Summit County density standards are not universal minimum lot sizes: Agriculture Protection uses 40 acres per dwelling, and AG-100 and AG-160 use 100 and 160 acres respectively²⁰. A qualifying Cluster Bonus/Agricultural Preservation Subdivision may have 0.75-acre lots, or smaller lots with Health Department approval, but those lots cannot be subdivided again⁹. On conforming Agriculture Protection lots, structures need 100 feet from a public road right-of-way and 50 feet from side and rear lot lines; maximum building height is 32 feet²⁰. Commercial and industrial zones cap lot coverage at 60%, subject to further parking, circulation and site-design constraints²⁰.

The Summit County Health Department must issue a permit before anyone installs, constructs, alters, replaces, enlarges, extends or otherwise modifies an onsite wastewater system⁵. A conventional or advanced-system permit is valid for 1 year and can be renewed twice for 1 additional year each; repair or remodeling of an existing or failing system requires a repair/remodel permit⁵. Summit County requires periodic septic inspection, maintenance and servicing, with greater oversight for complex systems; violations can lead to closure to human occupancy, abatement and billing of abatement costs⁴.

Site feasibility deserves early attention because only about 3.8% of mapped county soils avoid a severe USDA limitation rating for a conventional septic drain field²¹. Ask Summit County Environmental Health about septic feasibility before fixing a house location³. Changing a property's use, expanding a dwelling or adding an accessory structure larger than 120 square feet also triggers Health Department review of system adequacy⁵. Final wastewater approval is required for a permitted project served by septic before the applicable certificate of occupancy¹³.

We could not confirm a countywide rule allowing RV occupancy on private land in Summit County. Utah's RV-park rule addresses temporary living quarters inside an RV park and requires the park to comply with local zoning, building, health and fire rules; it is not permission to occupy an RV on any parcel⁶. Where a parcel lies in a mapped flood zone (A1-30, AH or AE), an RV must be on the site fewer than 180 consecutive days, be fully licensed and ready for highway use, or meet the county's floodplain permit, elevation and anchoring rules²². Ask the Summit County Planning Department how the applicable development code treats the proposed use^2,23.

We also could not confirm one operative countywide tiny-home rule. A small dwelling does not bypass the general building-permit requirement merely because it is called a tiny home¹. Eastern Summit County provides a clearer path for mobile homes: a mobile home with a foundation is allowed in the AP, AG-100, AG-160, CA and HC districts, while a mobile home without a foundation is conditional in those districts⁹. Classification matters, so have County Planning confirm whether the proposed unit is a mobile, manufactured, modular or site-built home⁹.

1. For unincorporated land, identify the Snyderville Basin or Eastern Summit County planning district, then ask County Planning for parcel zoning and required planning approval^2,23.

1. Resolve water and wastewater early: a private well needs a valid water right and a Start Card before construction, while onsite wastewater goes through the Summit County Health Department^3,8.

1. Prepare the applicable building checklist and submit the complete package through EPROCESS 360; paper plans are not accepted¹.

1. Provide a geotechnical report when the lot slope is 15% or greater, and account for any required planning approval or transportation impact fee review¹.

1. Complete the required inspections and obtain final approvals from every applicable department or utility before occupancy^12,13.

Verify jurisdiction, zoning and legal-lot status before relying on a listing: unincorporated Summit County uses separate Snyderville Basin and Eastern Summit County codes². Eastern Summit generally requires a lot of record or legally created lot for a dwelling, subdivision or other development action⁹. A bona fide division of qualifying agricultural land can avoid the ordinary subdivision or platting process only while the land remains agricultural; later nonagricultural use must comply with the development code⁹.

Investigate wastewater, water, slope, flood exposure and legal access before designing. Only about 23.7% of county land has a slope of 15% or less, and the county requires geotechnical reports when a permit lot reaches the 15% slope threshold^1,21. Development in mapped Flood Zone A requires a floodplain permit, engineering calculations and elevation documentation²⁴. County-road driveways have dimensional and grade standards, while state-highway access requires a state conditional access permit^24,25.