Fees
Estimated city fees
Baseline for a simple permitted adu: $500–$1,800 estimated combined fees (permit + plan review) for a typical new ADU in Atlanta; excludes any Historic Preservation review or variance costs
| Fee | Amount | Notes |
|---|---|---|
| Building permit + plan review fee | $500–$1,800 estimated (varies by valuation) | Atlanta Office of Buildings calculates residential permit fees based on declared construction valuation. A new detached ADU generates higher fees than a simple internal conversion. Verify current fee amounts through the Atlanta Permitting Portal. |
| Inspection fees | Included or bundled with the building permit | Required inspections (footing, framing, final) are typically bundled with the Atlanta building permit. Re-inspection fees may apply for failed inspections. |
| Historic Preservation review (if applicable) | Varies by scope and district | Properties in Atlanta Historic Preservation overlay districts requiring a Certificate of Appropriateness from the Urban Design Commission will incur additional application fees and review time before the building permit can be issued. |
| Zoning variance / special exception (if required) | Varies | If the proposed ADU requires a variance or special exception from the Atlanta Board of Zoning Adjustment, application fees and hearing costs apply and add significant time. |
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Conditions
The rules that apply
- A building permit is required for any Accessory Dwelling Unit (ADU) in Atlanta, whether attached (internal conversion or addition) or detached (separate structure on the lot).
- Atlanta liberalized its ADU zoning in 2023 as part of its missing-middle housing update. ADUs are now permitted by right in residential R-1, R-2, R-3, R-4, R-4A, and R-5 single-family and low-density residential zone districts.
- Georgia SB 70 (signed 2023) provides state enabling authority for cities to allow ADUs — but it is not a full preemption law comparable to California's SB 897, Washington's HB 1337, or Oregon's HB 2001. SB 70 allows municipalities to permit ADUs and prohibits certain restrictive practices, but it does not override all local regulations. Atlanta's rules reflect the city's own 2023 zoning update, not a state mandate.
- Atlanta allows one ADU per lot. The ADU may be detached (a separate structure, typically in the rear yard) or attached (an addition to or internal conversion of the primary dwelling).
- Maximum ADU size in Atlanta: the smaller of 750 square feet of gross floor area or 50% of the gross floor area of the primary dwelling.
- Setbacks for a detached ADU: minimum 5-foot rear setback and side setbacks per the applicable residential zone district. Confirm current setback requirements with the Atlanta Office of Zoning and Development.
- Atlanta does not require owner-occupancy as a condition for building or operating an ADU under the 2023 zoning update.
- One off-street parking space is required for the ADU unless the parcel qualifies for a parking reduction under Atlanta's zoning standards.
- Atlanta has numerous Historic Preservation overlay districts — including portions of Inman Park, Grant Park, Cabbagetown, Midtown, Druid Hills, and others — where an ADU visible from the public way or otherwise subject to Urban Design Commission jurisdiction may require a Certificate of Appropriateness before a building permit can be issued.
- All permits are filed through the Atlanta Permitting Portal (Atlanta, GA Office of Buildings).
Documents
What you'll need to file
- Residential building permit application submitted through the Atlanta Permitting Portal.
- Scaled site plan showing property lines, setbacks, easements, tree-protection zones, existing primary dwelling, and proposed ADU footprint.
- Construction drawings including floor plans, elevations, cross sections, and roof plan for the ADU, complying with the Georgia State Minimum Standard Codes (Georgia adopts the IRC for residential construction).
- Structural details for footings, posts, beams, joists, roof framing, and all connections.
- Erosion and sedimentation control plan if the project disturbs more than 1 acre, or a simplified E&S plan as required by the City of Atlanta Department of Watershed Management.
- Energy code compliance documentation per the Georgia Energy Code (Georgia adoption of IECC).
- Contractor information confirming the contractor holds a valid State of Georgia residential contractor license or is otherwise qualified under Georgia law.
- Certificate of Appropriateness from the Atlanta Urban Design Commission if the property is in a Historic Preservation overlay district and the proposed ADU work is subject to their review.
- Tree removal or encroachment permit from the Atlanta Office of Zoning and Development if the project impacts protected trees under Atlanta's Tree Protection Ordinance.
Process
How the permit process works
Sequential — each step gates the next.
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Confirm zone district and ADU eligibility Use the Atlanta Zoning Map through the Atlanta Office of Zoning and Development to verify the parcel is in an R-1, R-2, R-3, R-4, R-4A, or R-5 residential zone district. Confirm the proposed ADU type (detached or attached) and size comply with Atlanta's 2023 ADU standards — max 750 square feet or 50% of the primary dwelling GFA, whichever is smaller.
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Check for Historic Preservation overlay district Determine whether the property is in an Atlanta Historic Preservation (HP) overlay district. Atlanta has HP overlays covering multiple neighborhoods — contact the Atlanta Urban Design Commission or use the Atlanta Zoning Map to check. If the property is in an HP overlay and the proposed ADU work is visible from the public way or otherwise subject to UDC jurisdiction, a Certificate of Appropriateness must be obtained before applying for a building permit.
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Check for tree protection impacts Atlanta's Tree Protection Ordinance protects specimen, heritage, and other regulated trees. If the proposed detached ADU or site work encroaches on protected trees, obtain a tree removal or encroachment permit from the Atlanta Office of Zoning and Development before submitting the building permit application. Atlanta's tree permitting can add time and mitigation costs.
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Obtain Certificate of Appropriateness (if applicable) If the property is in an Atlanta Historic Preservation overlay district, submit a COA application to the Atlanta Urban Design Commission. The UDC reviews for compliance with applicable HP district guidelines. Obtain the COA before submitting the building permit application to the Atlanta Office of Buildings.
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Prepare the permit package Assemble the building permit application, site plan, construction drawings, structural details, energy code documentation, and any required stormwater or erosion control materials. Confirm the contractor holds a valid Georgia residential contractor license.
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Submit through the Atlanta Permitting Portal File the building permit application and upload plans through the Atlanta Permitting Portal. Pay the plan review fee at intake. The Atlanta Office of Buildings coordinates review with Zoning, Watershed Management, and other city departments as needed for the project scope.
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Respond to plan review comments Atlanta Office of Buildings reviewers will issue correction notices if plans require changes for building code, zoning, energy code, or stormwater compliance. Address all corrections and resubmit through the Atlanta Permitting Portal to advance the application.
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Pay remaining fees and receive the permit After plan approval, pay any remaining permit fees. The Atlanta Office of Buildings issues the permit. Post it at the job site before construction begins.
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Complete inspections and close out Schedule required inspections (footing, framing, final, and any MEP-related) through the Atlanta Permitting Portal or by contacting the Atlanta Office of Buildings. After all inspections pass, the permit is closed and the ADU may be lawfully occupied.
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Tools & materials
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Provenance
Code basis & official sources
Last verified 2026-04-18.
Atlanta Zoning Ordinance (Sections governing residential use and ADU allowances, as amended by the 2023 missing-middle update), Georgia State Minimum Standard Codes (Georgia adoption of IRC for residential construction), Georgia Energy Code (IECC adoption), Atlanta Tree Protection Ordinance, and Georgia SB 70 (2023) as enabling background.
Residential permit page: https://www.atlantaga.gov/government/departments/city-planning/office-of-buildings/permits-licensing
If you skip the permit
- The Atlanta Office of Buildings can issue a Stop Work Order and require all unpermitted construction to cease immediately.
- Atlanta code enforcement can assess daily fines and place liens on the property for continued violations.
- An unpermitted ADU cannot be lawfully occupied or rented; it lacks a final inspection and closed permit.
- After-the-fact permitting is more costly and time-consuming, and may require demolishing or exposing completed work to meet inspection requirements.
- An unpermitted ADU in an Atlanta Historic Preservation overlay district triggers Urban Design Commission enforcement exposure in addition to Office of Buildings enforcement.
- Georgia real estate disclosure obligations and lender/title company review increasingly identify unpermitted dwelling units, creating complications during refinancing or property sale.
FAQ
Common Atlanta adu permit questions
Do I need a permit for an ADU in Atlanta, GA?
Yes. Any ADU in Atlanta — attached or detached — requires a building permit from the Atlanta Office of Buildings filed through the Atlanta Permitting Portal. Atlanta's 2023 zoning update allows ADUs by right in residential R zones, but the permit and plan review process is still required.
Does Georgia have a statewide ADU law?
Georgia SB 70 (2023) provides enabling authority for cities to allow ADUs and limits certain restrictive practices, but it is not a full preemption law comparable to California's SB 897, Washington's HB 1337, Oregon's HB 2001, or Colorado's HB24-1152. Atlanta's ADU rules come from Atlanta's own 2023 missing-middle zoning update. The city retains meaningful authority over local ADU standards — including parking requirements and historic overlay reviews — that states with full preemption have eliminated.
What is the maximum ADU size in Atlanta?
Atlanta caps ADU size at the smaller of 750 square feet of gross floor area or 50% of the primary dwelling's gross floor area. For example, if your primary home is 1,000 square feet, the ADU is capped at 500 square feet (50% of 1,000 sqft, which is less than 750 sqft). If the primary home is 2,000 square feet or larger, the ADU is capped at 750 square feet.
Does Atlanta require owner-occupancy for an ADU?
No. Atlanta's 2023 zoning update does not require the property owner to reside on site as a condition for permitting or operating an ADU. This aligns with Georgia SB 70's direction away from owner-occupancy requirements as a barrier to ADU construction.
What if my Atlanta property is in a Historic Preservation overlay district?
Atlanta has Historic Preservation (HP) overlay districts in multiple neighborhoods — check the Atlanta Zoning Map or contact the Atlanta Urban Design Commission to determine if your property is in one. If it is, exterior ADU work that is visible from the public way (or otherwise subject to UDC jurisdiction) requires a Certificate of Appropriateness (COA) from the Urban Design Commission before the Atlanta Office of Buildings will issue a building permit. COA review typically takes 4–8 weeks and must be on the critical path of your project timeline.
Does Atlanta's Tree Protection Ordinance affect ADU construction?
Potentially, yes — especially for detached ADUs in rear yards of older neighborhoods. Atlanta's Tree Protection Ordinance regulates removal of and encroachment on specimen, heritage, and other protected trees. If your ADU site work affects protected trees, you'll need a tree removal or encroachment permit from the Atlanta Office of Zoning and Development. This is often a critical-path item: the tree permit may need to be resolved before or alongside the building permit application.
How long does an ADU permit take in Atlanta?
Standard plan review at the Atlanta Office of Buildings typically takes 10–20 business days. Total time from application to permit issuance is often 8–20 weeks. If a Historic Preservation COA is required, add 4–8 weeks before the building permit can even be filed. Tree permit review, if needed, also adds time. BZA variance proceedings can add 3–5 months.
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§ C Companion calculators
Disclaimer: Informational only — not legal advice. Rules change; verify with Atlanta permitting staff before you build.