ADU rules in Alpharetta, GA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Accessory Dwelling Units in unincorporated Fulton County are permitted in residential zones with a maximum of 750 sq ft under Zoning Article 4. Atlanta amended its ADU rules in 2018 to allow ADUs in most R-zones.
Fulton County allows ADUs in R-1 through R-3 zones with a 750-sq-ft cap, must be attached or detached from the principal dwelling, no separate utility meters (except gas), one parking space required, and the property owner must occupy either the principal or accessory unit. Atlanta updated Code §16-29.001 to allow ADUs as a permitted use in R-5, R-4A, R-4B, and PD-H zones with a 750-sq-ft max for detached or 50% of principal-house floor area for attached. Sandy Springs amended rules in 2020 to permit ADUs on lots 1+ acre.
Stop-work; required removal of unpermitted ADU; civil fines up to $1,000/day.
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