Maybe. As of October 2026, the City of Atlanta allows detached ADUs by right in the R-4, R-4A and R-5 districts and in some special public interest and historic districts, up to 750 sq ft and 20 feet tall. Lots in R-1, R-2 and R-3 are not on the list, and attached ADUs are not allowed anywhere in the city yet.
How do I find my zoning district?
The City of Atlanta publishes a zoning map you can search by address. Check two things: that the parcel is inside city limits, since many Atlanta mailing addresses are in unincorporated DeKalb or Fulton County or another city, and which district code applies. We confirm both in the lot check.
What are the current limits?
- Type. Detached only. City Planning says attached ADUs, such as basement or garage conversions inside the house, are not currently allowed.
- Size. 750 sq ft.
- Height. 20 feet.
- Coverage. A third-party summary (Steadily, updated October 2026) reports a 55% cap on combined lot coverage and a 25% cap on the share of the rear yard the ADU covers.
- Owner occupancy. Not required, per the same summary.
What is the city proposing?
City Planning's published proposal would add R-4B as an eligible district, allow attached ADUs up to 50% of the main house or 1,000 sq ft, raise detached units to 1,000 sq ft and 24 feet, set 4-foot side and rear setbacks in R-4, R-4A and R-4B, count only conditioned space toward the size limit, include ADUs in floor area ratio, and allow one for-sale ADU per lot through a zero-lot-line arrangement. In R-5 it would allow three units in total. The city describes this as a proposed policy, not adopted law.
What about the zoning rewrite?
Atlanta is also drafting a full replacement for its 1982 zoning ordinance. In September 2026 the council's zoning committee voted to hold the draft for revisions, and an outside expert's October 2026 critique urged the city to allow ADUs more clearly. As of October 2026 nothing has been adopted, so permits are reviewed under the current code.
When does the answer depend on more than zoning?
It depends on the specific parcel. Even in an eligible district, these can stop or reshape a project:
- historic district design review
- protected trees under the city's tree ordinance
- a rear yard too small for the coverage limits
- private covenants or HOA rules, which zoning does not override
- sewer access for a unit at the back of the lot
What if my lot is not eligible?
Your options are a rezoning or variance request, an addition that stays part of the main house without a separate kitchen, or waiting to see whether the proposal or the rewrite is adopted. If your property is just outside the city, the county or neighboring city's code applies instead; see our area pages.
Sources, as of October 2026:
- City of Atlanta Department of City Planning, "Allow attached ADUs, for sale option and expand citywide" (current rules and proposal).
- City of Atlanta, Zoning Reform page (2018 and 2019 amendments).
- Rough Draft Atlanta, "Atlanta zoning code critique" (October 16, 2026), on the status of the draft rewrite.
- Steadily, "ADU Housing Laws and Regulations in Atlanta" (updated October 1, 2026), for coverage and occupancy details.