ADU rules in Lehi, UT — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Lehi permits ADUs in single-family homes on lots 6,000+ sq ft (22,000+ for detached). Owner occupancy is required via recorded declaration. ADUs cannot be used as short-term rentals. One dedicated off-street parking space required.
Lehi City Code permits accessory dwelling units (ADUs) in owner-occupied single-family detached homes on lots of at least 6,000 sq ft. Each lot may have only one ADU. ADUs are not allowed in Resort Communities, Planned Communities, or on properties with duplexes/townhomes/multifamily. Owner must reside in the home as long as the ADU is occupied; a Declaration of Owner Occupancy must be recorded. Internal ADUs have no size restriction; the dwelling portion of a converted structure must be at least 300 sq ft. Detached ADUs require a lot of at least 22,000 sq ft, all utilities must connect to primary dwelling, and an all-weather access road must be provided. ADUs may not be rented short-term (30 days or less). One dedicated off-street parking stall (9x20 ft minimum) is required. Certain areas of Lehi have restricted ADU eligibility due to limited utility capacity — check with Planning (385) 201-1030.
Unpermitted ADU: stop-work order, fines. Short-term rental of ADU: code violation.
Lehi, UT
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Lehi, UT
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Side-by-side rule comparisons with other cities in Utah County.
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