ADU rules in Miami-Dade County, FL — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Miami-Dade County allows ADUs in AU, EU, and RU districts within the Urban Development Boundary. RU-1 requires minimum 7,500 sq ft lot with 400-800 sq ft ADUs. Garage conversions permitted on 5,000 sq ft lots with 220 sq ft minimum habitable area.
Miami-Dade County permits Accessory Dwelling Units in AU, EU, and RU zoning districts located inside the Urban Development Boundary, and GU districts designated for AU, EU, or RU. For RU-1 districts, the minimum lot size is 7,500 square feet with ADU size between 400 and 800 square feet. Garage conversions have reduced requirements: 5,000 square foot minimum lot and 220 square foot minimum habitable area. ADUs cannot exceed 50% of the primary dwelling's size or 1,200 square feet maximum. Either the main house or ADU must be owner-occupied. One ADU per property is allowed. Maximum one additional parking space required with no more than two vehicles. All construction must comply with HVHZ hurricane building code standards including impact-resistant windows and doors. Building permits cost $1,500-$3,000 with 3-6 month review times.
Unpermitted ADU construction results in stop-work orders. Non-compliant structures may require demolition. HVHZ violations require retrofitting. Penalties under Chapter 8CC.
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See how Miami-Dade County's adu rules rules stack up against other locations.
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