Columbus, GA Accessory Structures: ADU Permits (2026)

Columbus and Muscogee County operate as one consolidated government under the 1971 Consolidation Act. Land use is regulated through the Unified Development Ordinance (UDO), administered by the Department of Planning, with building permits issued by Inspections and Code Enforcement. Accessory dwelling units (sometimes called 'accessory apartments' or 'garage apartments' in the UDO) are conditionally permitted in most single-family and suburban residential districts (RE-1, SFR-1, SFR-2, SFR-3, SFR-4) subject to: one ADU per lot; placement behind the front building line of the principal dwelling; setbacks matching the underlying district (typical side 5-8 ft, rear 25 ft); maximum height tied to the accessory-structure cap (commonly 25 feet or one story below the principal dwelling); minimum lot area; and parking requirements. Permits required: zoning compliance through Planning; building permit through Inspections and Code under the Georgia State Minimum Standard Codes, which adopt the 2018 IRC and IBC with Georgia amendments under O.C.G.A. § 8-2-20 et seq.; and trade permits (electrical, mechanical, plumbing) under the corresponding state codes. Filings go through the Columbus eTRAKiT permit portal. The Historic District Preservation Commission reviews exterior changes within the Columbus Historic District (Uptown), High Uptown, and other locally designated districts. Properties in FEMA Special Flood Hazard Areas along the Chattahoochee River, Bull Creek, and Upatoi Creek must comply with the Columbus Flood Damage Prevention Ordinance and elevate finished floor to Base Flood Elevation plus the local freeboard.