ADU rules in Columbia 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 a second dwelling in Columbia County is allowed only where the Chapter 90 zoning district permits it. Most residential districts do not, and any unit needs a building permit and Planning Services approval.
Georgia's zoning enabling law (O.C.G.A. Title 36, Chapter 66) delegates land-use control to local government, and the state forces no county to permit accessory dwelling units. In unincorporated Columbia County, whether a detached guest cottage, in-law suite, or attached accessory apartment is allowed is decided by the residential district standards in Chapter 90 of the county code, administered by Planning Services. A separate dwelling is not permitted by right in ordinary single-family districts; it depends on your zoning classification and often carries owner-occupancy and non-rental conditions. Where a unit is allowed, Building Standards issues the permit and inspects egress, ceiling height, and smoke and carbon-monoxide alarms. Grovetown and Harlem set their own rules.
Building a second dwelling unit where the Chapter 90 district does not allow it is a zoning violation that draws enforcement and denial of a certificate of occupancy. Building without a permit is unlawful work.
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See how Columbia County's adu rules rules stack up against other locations.
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