Permit Required? Required
Typical Fee Range $1,000–$5,000 Includes building, zoning, and separate trade permits; impact fees may also apply.
Fee Method Valuation-based
Apply Online Apply at City of Atlanta Department of City Planning, Office of Buildings →

What's Required in Atlanta

  • ADUs are allowed 'by right' in zones R-4, R-4A, and R-5
  • Maximum size for a detached ADU is 750 heated square feet
  • Maximum height is capped at 20 feet
  • Combined lot coverage for main house and ADU cannot exceed 50–55%
  • Independent cooking and bathroom facilities must be included
  • No additional off-street parking is required for detached ADUs in Atlanta

How Much Does an ADU Permit Cost in Atlanta?

Budget $1,000–$5,000 for the Atlanta permit itself (valuation-based), issued by the City of Atlanta Department of City Planning, Office of Buildings — but treat that as the entry fee, not the total. ADUs are full dwelling units, so the permit stack usually includes building, electrical, plumbing, and mechanical trade permits, plus plan review. One local note: includes building, zoning, and separate trade permits; impact fees may also apply. Get an itemized fee estimate from the department before finalizing your budget; the spread between a simple conversion and a new detached build is wide.

ADU Size Limits and Zoning Rules in Atlanta

Before drawing plans, check the two gates that sink most ADU projects: size and zoning. Size ceilings vary by lot and ADU type (attached, detached, or conversion), so confirm your specific configuration. Other recorded conditions: no additional off-street parking is required for detached ADUs in Atlanta. Setbacks, height limits, and utility connections layer on top of those rules. The City of Atlanta Department of City Planning, Office of Buildings can confirm what your specific lot allows — worth doing before you pay for architectural drawings rather than after.

How to Get a ADU Permit in Atlanta

1

Step 1: Zoning Verification

Confirm your lot allows ADUs and identify setback requirements (e.g., 4' rear for R-5).

2

Step 2: Professional Plans

Secure IRC-compliant architectural and structural plans.

3

Step 3: Portal Submission

Submit a 'New Residential Construction' application via the Accela portal.

4

Step 4: Fee Payment

Pay valuation-based building and zoning fees online.

5

Step 5: Full Inspections

Schedule the complete series: Foundation, Framing, Rough MEP, and Final.

Frequently Asked Questions

Yes, they are allowed by right on most residential lots in R-4, R-4A, and R-5 zones.
Permit fees start around $1,000 for building and utility permits.
Detached ADUs are limited to a maximum of 750 heated square feet.