Yes: Atlanta allows one detached accessory dwelling unit by right on a lot with a single-family house in the R-4, R-4A and R-5 districts (Zoning Ordinance Sec. 16-06.004(12), 16-06A.004(11), 16-07.004(12)) and in several SPI and historic districts; R-1 through R-3 and R-4B do not list ADUs. The unit is capped at 750 sq ft and 20 ft and, like any accessory building, at 30% of the main house's floor area (Sec. 16-29.001(12)(a)7, 16-28.004(3)); attached or basement ADUs are not a permitted type. Setbacks are 4 ft side and rear in R-5 but 7 ft side and 15 ft rear in R-4 and R-4A, no parking is required, and no owner-occupancy rule applies to long-term rental. You need an Office of Buildings building permit filed through the Accela portal: roughly $1,700-$2,750 in permit fees for a $150,000-$300,000 build plus a $4,591 development impact fee (transportation share halved near a MARTA station), with no published review time.
Zoning & Size Requirements [1][2][3][4][5][6][7]
Yes — Atlanta allows ADUs. A detached ADU can typically be up to 750 sq ft under current Georgia and Atlanta zoning rules.
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| Allowed Zones | By right as an accessory use in R-4 (Sec. 16-06.004(12)), R-4A (16-06A.004(11)) and R-5 (16-07.004(12)), the districts covering most of the city's single-family lots, plus certain SPI and historic districts under their own chapters. Not listed in R-1, R-2, R-2A, R-2B, R-3, R-3A or R-4B (16-06B.004), where a second unit needs a rezoning. Check the parcel's district on the city's GIS property search first. |
| Max Size (Detached) | 750 sq ft or less (definition, Sec. 16-29.001(12)(a)7). Two further caps apply to any accessory building in R-1 through R-5 (Sec. 16-28.004(3)): gross floor area no more than 30% of the main house's floor area, counting garage and unconditioned space in the ADU, and footprint no more than 25% of the rear yard. A 2,000 sq ft house therefore allows a 600 sq ft ADU, not 750. |
| Max Size (Attached) | Not a permitted ADU type: the code defines an accessory dwelling as a detached unit (Sec. 16-29.001(12)(a)7). A basement or garage apartment inside the house is a second dwelling unit, allowed only where two-family use is permitted (R-5). The 2021 City Design proposal to allow attached ADUs up to 1,000 sq ft was never adopted. |
| Max Size (JADU) | No junior ADU category exists in Atlanta's zoning ordinance. |
| Max Height | 20 ft for accessory buildings in R-1 through R-5 (Sec. 16-28.004(3)); Sec. 16-28.022 lists excluded roof elements. Enough for one story or a low loft, not a full two-story unit. |
| Max Units | One ADU: the total number of dwelling units on the parcel, ADU included, may not exceed two (Sec. 16-06.004(12), 16-06A.004(11), 16-07.004(12)). An R-5 lot that already has a duplex cannot add an ADU. The ADU cannot be subdivided or sold apart from the house (16-07.007(3)). |
Setback Requirements [1][2][3][4][5][6][7]
Atlanta requires a rear setback of about 4 ft for a detached ADU, and no additional parking is required. Owner-occupancy is not required — you can rent it out without living on the property.
| Rear Setback | R-5: 4 ft (Sec. 16-07.008(3), ADU exception). R-4 and R-4A: 15 ft, the district rear yard with no ADU exception (Sec. 16-06.008(3), 16-06A.008(3)); a Board of Zoning Adjustment variance ($100 filing fee) is the only way to go closer. |
| Side Setback | R-5: 4 ft (Sec. 16-07.008(2), ADU exception). R-4 and R-4A: 7 ft (Sec. 16-06.008(2), 16-06A.008(2)). On a corner lot the side-street yard also applies. |
| Front Setback | The ADU must sit to the side or rear of the house, inside the buildable area, and may not project past the house's front wall (Sec. 16-06.008(4), 16-06A.008(4), 16-07.008(4)). District front yards are 35 ft in R-4 and 30 ft in R-4A and R-5. |
| Parking Required | No parking required for an ADU in R-4, R-4A or R-5 (Sec. 16-06.010(6), 16-06A.010(6), 16-07.010(7); Ord. 18-O-1581). The house keeps its one required space. R-5 still lists an ADU on a parcel with no curb cut or no off-street parking as a special exception (Sec. 16-07.005(3)(c)); ask the Office of Zoning whether it applies to a lot with no driveway. |
| Owner Occupancy | Not required by the zoning ordinance for long-term rental: nothing in Sec. 16-06.004, 16-06A.004 or 16-07.004 requires the owner to live on the lot, so both the house and the ADU may be rented. Short-term rental of an ADU is allowed only if the property owner lives onsite (Sec. 16-29.001(88)). |
| Min Lot Size | No ADU-specific minimum. District minimums: R-4 9,000 sq ft and 70 ft frontage (Sec. 16-06.007), R-4A 7,500 sq ft and 50 ft (16-06A.007), R-5 7,500 sq ft and 50 ft (16-07.007). Smaller lots of record may still hold a single-family house, and R-5 sizes ADUs on such lots through its floor-area rule (16-07.008(5)); ADU floor area counts toward the lot's 0.50 FAR. |
Permit Process & Fees [8][9][10][11][12]
An ADU permit in Atlanta goes through a standard permit review. Review time: not published by the city. The Office of Buildings screens a submittal for acceptance within 48 business hours and routes it for review only after the invoiced deposit is paid; local ADU builders report about two months of plan review with several comment rounds (industry figure, Feb 2026). Fees range from $1,700-$2,750 for a $150,000-$300,000 ADU: building permit $7 per $1,000 of construction cost (minimum $150) plus a $25 technology fee, three trade permits at $150 plus $25 each, and a $100 certificate of occupancy (Department of City Planning fee tables, checked Sept 2026).
| Approval Process | Building permit from the Department of City Planning, Office of Buildings (55 Trinity Ave SW, Suite 3900), filed online through the Accela Citizen Access portal (aca-prod.accela.com/ATLANTA_GA) with the Building Permit Application Packet, site plan, construction drawings and a sworn cost-of-construction form. Zoning review, arborist review under the Tree Protection Ordinance and site development review run inside the permit; historic and SPI districts add a Certificate of Appropriateness or Special Administrative Permit first. |
| Review Timeline | Not published by the city. The Office of Buildings screens a submittal for acceptance within 48 business hours and routes it for review only after the invoiced deposit is paid; local ADU builders report about two months of plan review with several comment rounds (industry figure, Feb 2026). |
| Permit Fees | $1,700-$2,750 for a $150,000-$300,000 ADU: building permit $7 per $1,000 of construction cost (minimum $150) plus a $25 technology fee, three trade permits at $150 plus $25 each, and a $100 certificate of occupancy (Department of City Planning fee tables, checked Sept 2026). |
| Impact Fees | Development impact fee, assessed at building permit (Code Part 19, Ch. 1; Ord. 21-O-0096, full Phase 3 rate since Sept 1, 2023): the smallest residential tier, a dwelling under 1,500 sq ft, is $4,591 (transportation $2,940, parks $1,129, fire $260, police $262); the transportation share is halved within 1,000 walking ft of a MARTA station, giving $3,121. The ordinance has no ADU line or exemption, so confirm the classification with COAImpactFees@atlantaga.gov. |
| Plan Check | Included in the building permit review; no separate plan-check fee or published turnaround. The permit fee is set on the higher of your sworn cost estimate or the reviewer's estimate from the city's standard construction-cost table. |
| Pre-Approved Plans | None. Neither the City of Atlanta nor the State of Georgia publishes pre-approved ADU plans; every ADU goes through full plan review. |
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Construction Costs [13][14][15]
Building an ADU in Atlanta typically costs $120,000-$240,000 ($140-$280 per sq ft); a garage conversion runs $60,000-$140,000.
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| Average Build Cost | $120,000-$240,000 |
| Cost per Sq Ft | $140-$280 |
| Garage Conversion | $60,000-$140,000 |
| Prefab ADU (Installed) | $85,000-$190,000 |
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Rental Income Potential [16][17][18]
A 2-bedroom ADU in Atlanta rents for around $1,650-$2,300/mo, an estimated 6-9% gross yield on a $150,000-$250,000 build at $1,300-$1,750/mo; both the house and the ADU may be rented long-term.
| Avg Rent (1 Bedroom) | $1,300-$1,750/mo |
| Avg Rent (2 Bedroom) | $1,650-$2,300/mo |
| Short-Term Rental | Yes with conditions: an ADU may be a short-term rental only if the property owner lives onsite (Sec. |
| Est. Annual ROI | 6-9% gross yield on a $150,000-$250,000 build at $1,300-$1,750/mo; both the house and the ADU may be rented long-term |
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Recent Law Changes
What's Changed Recently
- Verified Sept 20, 2026 against the codified Zoning Ordinance (Part 16, current through Ord. 2025-43 of Dec 10, 2025): the ADU rules are unchanged since Ord. 18-O-1581 took effect Jan 31, 2019 (750 sq ft, 20 ft, no parking, R-4/R-4A/R-5 only; R-5 ADUs date from Ord. 16-O-1548, May 1, 2017)
- Not adopted: the Department of City Planning's 'Create more flexible ADU options' package (attached ADUs, 1,000 sq ft, 24 ft height, 4 ft setbacks in R-4/R-4A, ADUs in R-4B, for-sale ADUs, three units in R-5) remains a proposal; R-4B still lists no ADU (Sec. 16-06B.004). Earlier versions of this page presented it as pending
- ATL Zoning 2.0 (full rewrite of the 1982 code): Draft V2 released Dec 19, 2025 with comments to April 8, 2026; Draft V3 is 'underway' per atlzoning.com as of Sept 20, 2026 and no adoption vote has been held. Until a new ordinance is adopted, the rules above govern
- Development impact fees reached the full Phase 3 rate on Sept 1, 2023 ($4,591 for a dwelling under 1,500 sq ft, $3,121 within 1,000 walking ft of a MARTA station); no ADU exemption was added
- From Sept 14, 2026 the city passes credit-card processing fees on Accela permit payments to the customer; eCheck, ACH and personal check remain fee-free
- Georgia: no statewide ADU law is in force. HB 1166 (2026 session), which would have required local governments to allow ADUs of 400 sq ft or less, advanced in a House committee but no enactment could be verified for this update; Atlanta's local rules govern
Tips for Building an ADU in Atlanta
- Size math first: 750 sq ft is the ceiling, but Sec. 16-28.004(3) also caps any accessory building at 30% of the house's floor area with every square foot of the ADU counted, conditioned or not. House 1,800 sq ft: ADU 540 sq ft. House 2,500 sq ft or larger: the full 750
- R-5 is the easy district: 4 ft side and rear setbacks and a 55% lot-coverage cap (16-07.008). In R-4 and R-4A the 15 ft rear and 7 ft side yards apply to the ADU, so a full-size unit needs roughly 40 ft of depth behind the house; a BZA variance costs $100 to file and is decided at a public hearing
- Worked permit fee: a $150,000 project is $1,050 building permit + $25 technology fee + about $525 in trade permits + $100 certificate of occupancy, about $1,700; $250,000 about $2,400; $300,000 about $2,750. The $4,591 impact fee (or $3,121 near a MARTA station) comes on top
- Trees: the Tree Protection Ordinance applies to the ADU footprint; arborist review runs inside the building permit, and removing or impacting protected trees adds recompense fees, so set the footprint around the tree survey
- Historic or SPI district: detached ADUs are allowed in several, but a Certificate of Appropriateness ($10-$200) or Special Administrative Permit ($500) must be approved before the building permit
- Renting: both the house and the ADU may be long-term rentals with no owner-occupancy rule; short-term rental of the ADU requires you to live onsite and hold a city STR license (Ord. 20-O-1656)
- Cost basis: the build-cost ranges are national industry figures last checked Feb 2026, not Atlanta bids; local design-build firms quote turnkey detached units on 8-10 month timelines (4-5 months of survey, feasibility and permitting), so get three local bids and budget time as well as money
- HOA covenants can still bar an ADU where the zoning allows one; check deed restrictions before paying for plans
- Cost basis (2026-09-20 re-verification): short term allowed: Yes with conditions: an ADU may be a short-term rental only if the property owner lives onsite (Sec. 16-29.001(88)), and the host needs a City of Atlanta short-term rental license (Ordinance 20-O-1656, in force since March 1, 2022, renewed yearly) covering a primary residence plus one additional unit.
ADU Builders in Atlanta
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Sources & References
All data on this page is sourced from official government records and verified market data. View our full methodology.
- Atlanta Code of Ordinances, Part 16 Zoning, Chapter 6 R-4: Sec. 16-06.004(12) ADUs, 16-06.007 lots, 16-06.008 yards, 16-06.010(6) parking Municipal Code — Accessed 2026-09-20
- Atlanta Zoning Ordinance Chapter 6A R-4A (Sec. 16-06A.004(11), .007, .008, .010(6)) and Chapter 6B R-4B (Sec. 16-06B.004, no ADU) Municipal Code — Accessed 2026-09-20
- Atlanta Zoning Ordinance Chapter 7 R-5: Sec. 16-07.004(12), 16-07.005(3)(c), 16-07.007, 16-07.008(2)-(5), 16-07.010(7) Municipal Code — Accessed 2026-09-20
- Atlanta Zoning Ordinance Sec. 16-28.004(3) accessory buildings (20 ft, 30% of main structure, 25% of rear yard) and Sec. 16-29.001(12)(a)7 ADU definition (750 sq ft), (88) short-term rental Municipal Code — Accessed 2026-09-20
- Atlanta Department of City Planning, Ordinances & Regulations (official link to the Municode zoning code) Planning Department — Accessed 2026-09-20
- Atlanta Department of City Planning, City Design Housing: 'Create more flexible ADU options' (proposal, not adopted) Planning Department — Accessed 2026-09-20
- ATL Zoning 2.0 (Department of City Planning): Draft V3 underway, prior drafts Planning Department — Accessed 2026-09-20
- Atlanta DCP, Getting started with Zoning, Development and Permitting Services: fee tables (building permit $7 per $1,000, $25 technology fee, trade permits, CO, BZA and SAP fees), permit exemptions, Sept 14, 2026 card-fee notice Planning Department — Accessed 2026-09-20
- Atlanta Office of Buildings, Building Permit Application Packet (v. 10.24): Accela submittal, 48-business-hour acceptance screen, deposit, cost-of-construction affidavit Planning Department — Accessed 2026-09-20
- Atlanta DCP, Development Impact Fee Program page Planning Department — Accessed 2026-09-20
- Atlanta Development Impact Fee Updated Fee Schedule (Phase 1-3, effective Sept 1, 2021/2022/2023) Planning Department — Accessed 2026-09-20
- Atlanta Code Part 19, Ch. 1 Development Impact Fees (Ord. 21-O-0096): Sec. 19-1008 assessment, 19-1009 MARTA reduction, 19-1016 exemptions Municipal Code — Accessed 2026-09-20
- Angi, ADU Construction Cost Data (national) Market Data — Accessed 2026-02-24
- Angi, Local ADU Contractor Costs (national) Market Data — Accessed 2026-02-24
- Atlanta ADU zoning guide and FAQ by a local design-build firm (updated Feb 2026): permitting about two months, 8-10 month turnkey timeline industry — Accessed 2026-09-20
- Zillow Rental Manager, Market Rent Data Market Data — Accessed 2026-02-24
- HUD Fair Market Rents Government Data — Accessed 2026-02-24
- Atlanta DCP, Short-Term Rental page (Ordinance 20-O-1656, effective March 1, 2022; license, primary residence plus one unit) Planning Department — Accessed 2026-09-20
- City of Atlanta Department of City Planning Planning Department — Accessed 2026-09-20
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