ADU rules in Pinellas County, FL — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Pinellas County allows accessory dwelling units in unincorporated residential zoning under Land Development Code Sec. 138-3210, with size, height, and design rules tied to the primary dwelling.
Sec. 138-3210 of the Pinellas County Land Development Code governs ADUs in unincorporated residential districts. ADUs may be attached or detached and provide a separate kitchen, bathroom, and sleeping area in line with Florida Statutes Sec. 163.31771. Recent amendments raised the maximum size to 1,000 square feet outside the Coastal Storm Area and capped units inside flood hazard areas at 750 square feet. Detached ADUs cannot exceed the height of the primary residence and must match exterior finish, roof style, and architectural details. Garages and storage that serve the ADU count toward its size cap. ADUs are intended to remain incidental to the primary residence and preserve the surrounding neighborhood character.
Building or occupying an ADU without zoning approval can trigger code enforcement, stop-work orders, daily fines, and required removal or modification to comply with Sec. 138-3210.
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See how Pinellas County's adu rules rules stack up against other locations.
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