Accessory Structures in Gwinnett County, GA (2026)
3 rules for unincorporated Gwinnett County, Georgia.
Verified from official government sources
ADU Rules
UDO § 210-140.10 allows one detached accessory dwelling per lot in Gwinnett County's residential districts, capped at 50% of the principal home's heated floor area, with the primary home owner-occupied and setbacks ranging from 20 feet side/40 feet rear in RA-200 and R-LL down to 5 feet side/10 feet rear in R-IF.
Gwinnett Accessory Dwelling Unit Rules
Some RestrictionsGwinnett County UDO § 210-140.10
210-140.10 Dwelling, Accessory. Detached accessory dwellings shall only be located in a rear yard, and shall be subject to the following setback requirements: Zoning District Side Yard Setback Rear Yard Setback RA-200 and R-LL 20 feet 40 feet R-100 10 feet 20 feet R-75, R-60, R-SR, TND 10 feet 15 feet R-IF 5 feet 10 feet ... A.No more than one accessory dwelling unit per primary dwelling unit.B...
ADU Owner Occupancy
Gwinnett County will not issue a Certificate of Occupancy for an accessory dwelling unit unless the primary single-family home on the same lot is owner-occupied. UDO Section 210-140.10 also caps ADUs at one per lot, limits floor area to 50 percent of the main house, and requires the Director of Planning and Development to inspect before anyone moves in.
Gwinnett County ADU Owner-Occupancy Rule
Some RestrictionsGwinnett County UDO § 210-140.10(B)
Prior to occupancy of an accessory dwelling unit, the owner of the principal single-family dwelling shall apply for a Certificate of Occupancy for the accessory dwelling and pay a fee established by the Board of Commissioners. The Director shall arrange for an inspection of the subject accessory dwelling and certify that the requirements below are met. Accessory dwellings shall be subject to th...
Shed & Carport Rules
Sheds and other accessory buildings in unincorporated Gwinnett County must sit at least 5 feet from property lines, or 10 feet once the building exceeds 500 square feet.
Gwinnett County Accessory Building Setback
Some RestrictionsGwinnett County UDO § 230-30.9, Table 230.1
230-30.9 Except as provided herein, accessory structures shall be located no closer than five feet to all property lines. Accessory buildings shall meet the following minimum setback requirements adjacent to all property lines: Table 230.1: Accessory Building Setback Requirements The following setback shall apply to accessory buildings, unless otherwise specified in this UDO: Accessory...
All Gwinnett County ordinances
See every category we cover for Gwinnett County: parking, noise, fences, fires, animals, pools, and more.
Gwinnett County Ordinance Hub →