ADU rules in Forsyth County, GA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Georgia has no statewide ADU mandate, so accessory dwellings in Forsyth County are governed entirely by the county's Unified Development Code. Whether a second dwelling or in-law suite is allowed depends on your residential zoning district.
Georgia's zoning enabling law (O.C.G.A. Title 36, Chapter 66) delegates land-use control to local government, and the state has passed no law forcing counties to permit accessory dwelling units. So in unincorporated Forsyth County, whether a detached accessory dwelling or in-law suite is allowed, and on what lot, is set by the residential district standards in the Unified Development Code, Appendix A of the county code. Where a unit is permitted, Forsyth County Building Inspections issues the building permit and inspects egress, ceiling height, and smoke and carbon-monoxide alarms under the state minimum codes. Cumming, the county's only city, sets its own rules.
Building a second dwelling unit where the zoning district does not allow it is a code violation that draws enforcement and denial of a certificate of occupancy. Building without a permit is unlawful.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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