ADU Guide · Verified 2026
Building an ADU in Georgia
Georgia has no statewide ADU mandate. Atlanta passed its own permissive ordinance in 2017 opening most of the city to ADU construction, but the surrounding suburbs remain largely closed, and every other Georgia city sets its own independent rule.
Quick Facts
Statewide floors set by No statewide ADU law; local zoning controls. Your city may be more generous but cannot go below them.
The Three Types of ADU
Atlanta was an early mover, its suburbs were not
Atlanta's 2017 ADU ordinance opened most of the city to construction, a genuinely early move relative to the broader statewide ADU reform trend that picked up nationally after 2020. But that permissiveness stops at the city line; most surrounding suburbs remain largely closed to ADUs under their own, separate, more restrictive zoning.
No state floor to rely on
Georgia has never passed a statewide ADU law, so every rule outside Atlanta, and even within it, comes entirely from the specific local zoning code.
What people get wrong
The most common mistake is assuming Atlanta's permissive 2017 rule reflects a broader Georgia trend. The suburbs immediately outside Atlanta can be, and often are, far more restrictive under their own independent zoning.
From Idea to Move-In: The Timeline
Who Administers It
Counties With Their Own Rules
These Georgia counties have verified, county-specific ADU rules that add to the state baseline:
Building It Yourself? Here's What You'll Need
Planning an ADU? Tools homeowners use in the design and layout phase:
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Check Your Local Rules
Your city may allow more than the state floor
State law sets the minimum; many Georgia cities and counties are more generous. Browse the full directory of 159 counties and every city in Georgia for local rules, fees, and building department contact details.
Browse the full Georgia directory →Not sure if your project needs a building permit, a zoning approval, or both? See our guide to building permits vs. zoning approval.
Official Sources
ADU law changes frequently and local ordinances add detail. This guide is general information, not legal advice, always confirm with your local building department. Reviewed by the StateDataIndex Editorial Team · Updated September 2026.