Accessory Structures in Salt Lake County, UT (2026)

3 county-level rules, plus city-specific rules for 5 cities in Salt Lake County, Utah.

Verified from official government sources

Note: These county rules apply to unincorporated areas of Salt Lake County. If you live within an incorporated city, that city's own rules apply — see the city list below.

ADU Rules

Salt Lake County adopted an ADU ordinance update (June 4, 2024) making ADUs easier to build in unincorporated residential areas. Internal ADUs require lots of at least 6,000 sq ft; detached ADUs require at least 7,000 sq ft. One ADU per lot permitted. Detached ADUs may be up to 20 feet tall. One parking space required for the ADU. Utah Code §10-9a-530 (HB 462, 2022) mandates ADU allowance.

Salt Lake County ADU / Accessory Dwelling Rules

Some Restrictions

Full ordinance details →Official source ↗

Shed Rules

Salt Lake County requires building permits for accessory structures in unincorporated areas. Title 15 (Building Code) and Title 19 (Zoning) govern shed placement, setbacks, and size. Structures must comply with zone-specific setback requirements and cannot be placed in required front yards.

Salt Lake County Shed & Outbuilding Rules

Some Restrictions

Full ordinance details →Official source ↗

Garage Conversions

Garage conversions to habitable space in unincorporated Salt Lake County require building permits and Utah Residential Code compliance. If converted to an ADU, Chapter 19.15 rules apply including lot size minimums and parking requirements. Certificate of occupancy required before habitation.