ADU rules in Decatur, GA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
ADUs are permitted in Decatur since 2012 in residential zones (R-85, R-60, R-50, RM-18, RM-22, RM-43). Max size is 800 sq ft or 40% of main home, up to 1,200 sq ft absolute maximum. Owner must occupy either the main home or ADU for at least 8 months/year. Two bedrooms maximum. 4-foot setbacks required.
Decatur's ADU regulations (UDO Art. 6, Use Provisions) allow one ADU per single-family home in multiple residential zones. Maximum size: 800 sq ft or 40% of primary dwelling (whichever is smaller), with an absolute max of 1,200 sq ft. JADUs (Junior ADUs) of up to 500 sq ft are allowed within the existing home footprint. Detached ADUs: max 16 feet tall, 4-foot setbacks, must occupy no more than 30% of backyard. Owner occupancy required (8 months/year minimum). Residency affidavit required. Permit timeline approximately 60 days.
Operating an ADU without complying with owner-occupancy requirements may result in permit revocation.
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Side-by-side rule comparisons with other cities in DeKalb County.
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