Garage conversion rules in Gwinnett County, GA — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Converting a garage into living space in unincorporated Gwinnett requires building permits covering structural, electrical, plumbing (if added), mechanical (HVAC), and energy code compliance. Replacement off-street parking must be maintained per UDO minimums.
Garage conversions are regulated as changes of occupancy from storage to residential under the Georgia Residential Code. Required: building permit for the conversion, insulation to meet current energy code (R-values for walls, floor, ceiling), egress windows meeting size/height requirements, heating/cooling capable of maintaining habitable temperatures, smoke and CO detectors per code, and proper electrical circuit adequacy. If the converted space becomes an ADU (separate dwelling), additional ADU rules apply. Critically, Gwinnett UDO requires minimum off-street parking per dwelling (typically 2 spaces). If garage conversion eliminates required parking, replacement spaces (driveway expansion or pad) may be needed. Converting to a rental unit or second dwelling requires zoning review. Restoration of garage door appearance may be required or prohibited depending on design review standards.
Unpermitted conversions: stop-work, fines, order to restore garage; cannot be used as habitable space; can affect home sale and title insurance.
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See how Gwinnett County's garage conversions rules stack up against other locations.
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