ADU rules in Salt Lake County, UT — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
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 Chapter 19.15 governs ADUs. Building permit required before construction. Water provider written confirmation required. ADUs must have a separate address marker. Internal ADUs cannot have separate utility meters; detached ADUs may. ADUs cannot be sold separately or subdivided. One parking space required per ADU in addition to primary dwelling requirement.
Unpermitted ADU: standard building code enforcement. May require demolition or legalization. Occupying unpermitted dwelling: code violation.
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See how Salt Lake County's adu rules rules stack up against other locations.
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