ADU Permit Guide for Georgia Homeowners

ADU Permit Guide for Georgia Homeowners

Accessory Dwelling Units (ADUs) are growing in popularity across Georgia. Whether you're building a garage apartment, backyard cottage, or basement unit, here's what you need for permitting.

What Is an ADU?

An ADU is a secondary living unit on a single-family residential lot. Types include:

• Detached ADU — Standalone structure in the backyard
• Attached ADU — Connected to the main house
• Garage conversion — Converting an existing garage
• Basement ADU — Finishing a basement as a separate unit

Zoning Requirements

Zoning is the first hurdle. Check with your local zoning office for:

• ADU allowance — Not all jurisdictions permit ADUs
• Lot size minimums — Many require a minimum lot size
• Setback requirements — Side, rear, and front yard setbacks
• Height limits — Typically 1-1.5 stories
• Parking — Additional parking may be required
• Owner occupancy — Some jurisdictions require the owner to live on-site

Engineering Requirements

PE-stamped engineering is typically required for:

• Foundation design — For detached ADUs or garage conversions
• Structural modifications — When connecting to the main house or modifying existing structures
• Utility connections — Plumbing and electrical design
• Site plan — Grading, drainage, and stormwater management

Permit Process

1. Zoning verification — Confirm ADUs are allowed and get any variances
2. Site plan — Show the ADU location, setbacks, parking, and utilities
3. Engineering plans — PE-stamped foundation and structural design
4. Building permit application — Include all drawings and forms
5. Utilities — Coordinate water, sewer/septic, and electrical connections
6. Inspections — Foundation, framing, and final inspections

Common ADU Challenges

• Septic system capacity — If on septic, the existing system may need expansion
• Setback conflicts — Especially on smaller lots
• Utility easements — Check for underground utilities before siting
• HOA restrictions — Homeowners associations may prohibit ADUs

Call (833) 205-7710 for ADU engineering services.

Get Your ADU Engineering Quote

Our engineers handle complete ADU engineering and permitting — structural design, civil site plans, zoning analysis, and PE-stamped permit packages — for ADUs across Georgia. See our ADU & zoning engineering overview for the full scope.