City · Georgia
ADU rules in Atlanta
These are the primary sources for accessory dwelling unit regulations in Atlanta: the city's own zoning code, planning department pages, and permit guides. Start here before talking to anyone: the rules below are what your permit reviewer will apply.
Rules at a glance
By right in the R-4, R-4A, and R-5 districts (plus some SPI and historic districts with their own accessory-use lists), where the total number of dwelling units on the parcel, including the ADU, does not exceed two. No ADU allowance in R-1 through R-3 or R-4B.
Code of Ordinances Secs. 16-06.004(12), 16-06A.004(11), 16-07.004(12)The zoning definition limits an accessory dwelling to 'a detached dwelling unit', and Sec. 16-28.004(1) otherwise prohibits using accessory buildings as dwellings. A City Planning proposal to allow attached ADUs (basement and garage conversions) had not been adopted as of the code codified through March 16, 2026.
Code of Ordinances Sec. 16-29.001(12)(a)7; Sec. 16-28.004(1)The 750 sq ft cap is in the definition of an accessory dwelling; the 30 percent and 25 percent limits are citywide accessory-building rules for R-1 through R-5. Height is capped at 20 feet.
Code of Ordinances Sec. 16-29.001(12)(a)7; Sec. 16-28.004(3); Sec. 16-07.008(5)No owner-occupancy condition appears in the ADU permissions (Secs. 16-06.004, 16-06A.004, 16-07.004), the accessory-structure standards (16-28.004), or the definition (16-29.001). A full-code search for owner occupancy paired with accessory dwellings returned no hits.
Code of Ordinances Secs. 16-06.004, 16-06A.004, 16-07.004 (silent; no owner-occupancy condition)The principal dwelling still requires one space per dwelling.
Code of Ordinances Sec. 16-06.010(6); Sec. 16-06A.010; Sec. 16-07.010(7)ADUs are listed as permitted accessory uses (by right, no special or conditional use permit) in R-4, R-4A, and R-5; standard building permits still apply. In other residential districts ADUs are simply not an allowed use.
Code of Ordinances Secs. 16-06.004(12), 16-06A.004(11), 16-07.004(12)STR ordinance is Part III, Part 20 of the Code of Ordinances (Secs. 20-1001 to 20-1008), adopted by Ord. 2021-14 on March 24, 2021; licenses issued by the Department of City Planning.
Code of Ordinances Secs. 20-1003, 20-1004(d), 20-1005(a)The fine print: 8 caveats that can change the picture
- Zone dependence: ADUs are allowed by right only in R-4, R-4A, and R-5 (plus certain SPI, BeltLine overlay, and historic districts with their own accessory-use provisions); R-1 through R-3 and R-4B have no ADU allowance.
- Detached only under the current definition; basement apartments and garage conversions are not authorized as ADUs.
- Two-unit cap: total dwelling units on the parcel, including the ADU, may not exceed two.
- Detached ADU envelope: 20 ft max height, no more than 25 percent of the rear yard, floor area no more than 30 percent of the main structure, in addition to the 750 sq ft cap.
- Setbacks differ by district: R-5 grants ADUs reduced 4 ft side and rear setbacks (Sec. 16-07.008), while R-4 and R-4A keep the standard 7 ft side yards.
- ADUs may not be subdivided from their lot (Sec. 16-07.007(3)); the pending reform would allow for-sale zero-lot-line ADUs.
- Pending reform: Atlanta City Design Housing proposes attached ADUs, a 1,000 sq ft cap, 24 ft height, 4 ft setbacks in R-4/R-4A/R-4B, and R-4B eligibility; NOT adopted as of the code codified through Ord. Z-2026-10 (March 16, 2026), so verify status before relying on it.
- Historic and SPI districts overlay their own accessory-structure rules that can be stricter than the base district.
Summarized from Atlanta's ordinance text, read July 2026; every row links the code section it came from. Rules often vary by zone and lot, so treat this as orientation, not a permit determination, and confirm with the planning department before you commit to a design.
ADU regulations
- citydesign.atlantaga.govOfficial sourceVerified July 2026https://citydesign.atlantaga.gov/create-more-flexible-adu-options
- library.municode.comOfficial sourceVerified July 2026Code of Ordinances §16-06.004https://library.municode.com/ga/atlanta/codes/code_of_ordinances?nodeId=PTIIICOORANDECO_PT16ZO_CH6SIMIREDIRE_S16-06.004PEACUSST
- library.municode.comOfficial sourceVerified July 2026Code of Ordinances §16-07.004https://library.municode.com/ga/atlanta/codes/code_of_ordinances?nodeId=PTIIICOORANDECO_PT16ZO_CH7TMIREDIRE_S16-07.004PEACUSST
- library.municode.comOfficial sourceVerified July 2026Code of Ordinances §16-28.004https://library.municode.com/ga/atlanta/codes/code_of_ordinances?nodeId=PTIIICOORANDECO_PT16ZO_CH28GESURE_S16-28.004ACUSST
Short-term rental rules
Planning to rent your ADU on Airbnb or VRBO? Atlanta regulates short-term rentals separately; check these before counting on nightly rental income.
- library.municode.comOfficial sourceVerified July 2026Code of Ordinanceshttps://library.municode.com/ga/atlanta/codes/code_of_ordinances?nodeId=PTIIICOORANDECO_PT20SHTERE
- atlantaga.govOfficial sourceReviewed July 2026https://www.atlantaga.gov/government/departments/city-planning/ordinances-regulations/short-term-rental
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