ADU rules in Gilbert, AZ — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Gilbert permits ADUs up to 1,000 sq ft or 75% of the primary dwelling. State law HB 2720 requires a minimum 5-foot setback. ADU parking must be behind the main building and screened from the street.
Gilbert allows accessory dwelling units on single-family lots subject to the Land Development Code. ADUs cannot exceed 75% of the main house's floor area or 1,000 square feet. Arizona's HB 2720 requires municipalities to allow ADUs with at least a 5-foot setback from property edges. Gilbert currently requires one additional off-street parking space for ADUs, though state law prohibits requiring additional on-site parking. ADU parking should be behind the main building's rear and screened from the street using landscaping. ADUs must have utilities and meet building code standards. The state casita law preempts some local regulations.
Unpermitted ADUs face code enforcement. ADUs exceeding size limits or not meeting setback requirements must be modified to comply.
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Side-by-side rule comparisons with other cities in Maricopa County.
See how other cities in Maricopa County handle adu rules.
See how Gilbert's adu rules rules stack up against other locations.
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