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2026 Cost Guide · Updated June 2026

ADU Cost in Georgia — Atlanta, Savannah, Athens & Statewide

Georgia's booming Atlanta metro and historic coastal and university markets create strong ADU demand. City-by-city cost data across Atlanta, Savannah, and Athens — built from permit records, contractor data, and regional labor rates.

$85K–$240KDetached ADU range
$35K–$90KGarage conversion (lowest cost)
8–14 yrsTypical payback period
No state lawRules set city-by-city

GEORGIA
ADU Collection

Beautiful. Functional. Built for Georgia Living.

🏠Increase Property Value
💲Generate Rental Income
👥Multi-Generational Living
🌿Sustainable Design
Georgia ADU front elevation
Georgia Detached ADU
Georgia Garage Conversion ADU
Georgia Attached ADU
Georgia Basement Conversion ADU
Georgia Modular Prefab ADU
Georgia ADU kitchen interior
Georgia ADU living room interior
Georgia ADU bedroom interior
Georgia ADU bathroom interior
Georgia ADU outdoor living and patio space
Planning & Inspiration
Planning Reference
Example 1-bedroom ADU floor plan, illustrative layout
Example Floor Plan

Illustrative 1-bedroom layout. Actual floor plans vary by ADU type, size, local code, and homeowner needs.

Georgia ADU exterior at twilight, warm interior light glowing
Georgia ADU and main house evening backyard view
Aerial view of Georgia property with backyard ADU
At a Glance

Georgia ADU costs — by type.

Detached ADU
$85K – $240K
$162–$350 per sq ft · Atlanta skews highest
🏡
Attached ADU
$80K – $200K
Shares one wall; 20–35% less than detached
🔗
Garage Conversion
$35K – $90K
Most affordable; uses existing structure
🚗
Basement Conversion
$40K – $95K
Common in Fulton County's hilly terrain
⬇️
Modular / Prefab
$85K – $190K
Fastest construction timeline
📦
💡

No statewide ADU law — rules vary by city. Georgia has no statewide ADU law, though HB 1166 — which would allow small ADUs under 400 sq ft statewide — remains under consideration. Atlanta caps detached ADUs at 750–1,000 sq ft depending on zoning district. Always verify current rules with your local planning department.

Calculate My ROI →
ADU Types

Which type fits your property?

01 / Most Common
Detached ADU
$85K – $240K

Freestanding backyard structure with the highest rental income and property value uplift. Atlanta's zoning reforms have expanded eligibility citywide, pushing this toward the top of the range.

Detached ADU Guide →
02 / Most Affordable
Garage Conversion
$35K – $90K

Uses an existing structure to cut cost significantly versus new detached construction while generating similar rental income in most Georgia markets.

Garage Conversion Guide →
03 / Fastest Build
Modular / Prefab
$85K – $190K

Factory-built construction offers a faster, more predictable timeline, with less exposure to Metro Atlanta's permitting backlogs and weather delays.

Prefab ADU Overview →
04 / Smaller Lots
Attached ADU
$80K – $200K

Shares one wall with the primary residence. DeKalb County permits attached ADUs up to 900 sq ft, making this a strong option for smaller in-town lots.

Attached ADU Guide →
05 / Common in Fulton
Basement Conversion
$40K – $95K

Fulton County's hilly terrain makes walkout basement conversions common and cost-effective, particularly for homes built into sloped lots.

Basement ADU Guide →
Cost by Region

Every Georgia market is different.

Atlanta Metro
Fulton · DeKalb · Decatur
$120K–$240K
$180–$350 per sq ft
Highest cost
Savannah / Chatham County
Historic District · Islands
$95K–$205K
$142–$290 per sq ft
Moderate
Athens-Clarke County
University of Georgia area
$85K–$185K
$128–$260 per sq ft
More affordable
Cost Factors

Why Georgia ADUs cost what they cost.

🏙️
Atlanta Zoning Reform
Atlanta's 2024–2025 zoning update raised the detached ADU cap to 1,000 sq ft in R-5, R-4, and R-4A districts, expanding both eligibility and typical project size.
Detached cap raised to 1,000 sq ft
🏛️
Historic District Review
Savannah's Historic District and similar overlay zones require additional architectural review for ADU exteriors, extending timelines and adding design cost.
Applies in historic overlay zones
⛰️
Hilly Terrain
Fulton County's sloped lots make basement and walkout conversions especially common and cost-effective compared to flatter Georgia markets.
Favors basement conversions
📋
City-by-City Rules
No statewide ADU law. Atlanta, Savannah, and Athens each set their own zoning, size limits, and owner-occupancy rules — HB 1166 could establish a statewide floor if passed.
Varies entirely by city
Homeowners reviewing ADU permit documents
Permits & Fees

What permitting actually costs.

Georgia has no statewide ADU permit standard. Each city sets its own fees, calculated on project valuation.

📄
Building Permit Fee — Atlanta
$2,400 – $4,000
Review timeline 55–90 days for straightforward projects.
🏗️
Building Permit Fee — Other Cities
$500 – $2,000
Varies significantly by city and project value.
💧
Utility Connection Fees
$3,000 – $18,000
Georgia Power meter connection alone typically runs $4,000–$5,000.
🧾
Impact / Development Fees
$2,000 – $4,000
Common in Atlanta; less consistent in other jurisdictions.
⏱️
Permit Review Timeline
4 – 13 weeks
Atlanta runs longer at 55–90 days; smaller cities are often faster.
Georgia Law
There's no state-level protection here.

Georgia has no statewide ADU law, though HB 1166 — which would allow small ADUs under 400 sq ft statewide, overriding local bans — remains under consideration as of mid-2026. Until it passes, every rule is set by the city or county.

Statewide ADU lawNone (HB 1166 pending)
Atlanta detached size cap1,000 sq ft
Owner-occupancy requirementVaries by city
Permit review timeline4–13 weeks
Best rental marketAtlanta
Short-term rentalsRestricted in Atlanta
💡 Verify your specific city's ADU ordinance first

Atlanta, Savannah, and Athens each set their own zoning, size limits, and owner-occupancy rules — and rules can differ block to block between incorporated cities and unincorporated county land. A quick call to your local planning department before design work begins prevents costly redesigns later.

Return on Investment

What a Georgia ADU returns.

$1,100–$2,300
Monthly rental income range statewide
8–14 yrs
Typical payback period (detached)
+12%–20%
Added property value
4–13 wks
Typical permit review timeline
Atlanta Metro
$1,300 – $2,300/mo
1-bed monthly rent
8–12 years
Estimated payback · Beltline & MARTA premium
Savannah / Chatham County
$1,150 – $1,700/mo
1-bed monthly rent
9–13 years
Estimated payback
Athens-Clarke County
$1,100 – $1,600/mo
1-bed monthly rent
9–14 years
Estimated payback · UGA student demand
Save Money

7 ways to cut your
Georgia ADU cost now.

Georgia is already one of the more affordable states to build in — these moves push savings further and prevent the most common costly mistakes.

Calculate My ADU ROI →
Compact detached ADU exterior
🏡
Compact Detached ADU
Georgia — statewide range
Added Property Value
+12%–20%
1
Convert before you build new
If your property has a qualifying garage or Fulton County walkout basement, start there — conversions cost significantly less than detached new construction while generating similar rental income.
Saves substantially vs. new construction
2
Get a minimum of three contractor bids
Getting at least three bids from ADU-experienced contractors typically saves 20–40% on the same scope in the Atlanta market.
Saves 20–40% on the same scope
3
Start design during permit review
Atlanta's permit review runs 55–90 days. Begin contractor research during that window rather than waiting for approval to start.
Cuts weeks off total project timeline
4
Right-size to your zoning district's cap
Atlanta's detached ADU cap now reaches 1,000 sq ft in updated districts, but building to the max isn't always the best ROI — size to your target renter's needs and your market's rent ceiling.
Avoids paying for unrented square footage
5
Explore financing options before you start
HELOC, cash-out refinance, and ADU-specific loan programs all have different costs and qualification criteria. Choosing the right option can save thousands over the project's life.
Can save $10,000–$40,000 over project life
6
Verify your city's zoning and size limits first
Atlanta, Savannah, and Athens each set their own ADU size caps and owner-occupancy rules. A feasibility check before design work begins prevents thousands in wasted design fees.
Prevents wasted design fees
7
Budget for the Georgia Power meter connection
A separate electrical meter connection for the ADU typically costs $4,000–$5,000 and is billed directly by Georgia Power — budget for it early rather than as a late surprise.
Prevents late-stage budget surprises
Frequently Asked Questions

Georgia ADU answers.

How much does an ADU cost in Georgia?
ADU costs in Georgia range from $35,000 for a basic garage conversion to $240,000 for a large detached new build in Atlanta, the most expensive market. Georgia has no statewide ADU law — rules and costs vary significantly by city.
Does Georgia have a statewide ADU law?
Not yet. Georgia has no statewide ADU law as of mid-2026, though HB 1166 — which would allow small ADUs under 400 sq ft statewide, overriding local bans — is under consideration in the state legislature. Until it passes, every city and county sets its own rules.
How long does it take to get an ADU permit in Georgia?
Permit review timelines vary widely: Atlanta runs 55–90 days due to high application volume, while many smaller Georgia cities and counties process permits in 4–8 weeks. Build the longer timeline into your project schedule if you're in Metro Atlanta.
Is Atlanta the best market for a Georgia ADU?
Atlanta's tech and corporate sector drives the strongest rental demand and highest rents in the state, especially near the Beltline and MARTA stations, but construction and permitting costs there are also the highest. Savannah and Athens offer lower build costs with correspondingly different demand drivers — run the numbers for your specific market.
What is the cheapest ADU to build in Georgia?
Garage conversions are the least expensive option, typically $35,000–$90,000 in most Georgia markets, using an existing structure to significantly cut cost versus new detached construction.
How much are ADU permit fees in Georgia?
Atlanta permit fees typically run $2,400–$4,000. Other Georgia cities generally charge $500–$2,000. Impact fees in Atlanta add another $2,000–$4,000. Always request an itemized fee estimate from your specific city.
What is the ROI on an ADU in Georgia?
Georgia ADUs generate $1,100–$2,300 per month depending on market, with Atlanta commanding the highest rents. Payback periods run 8–14 years. Property value typically increases +12%–20% with a permitted ADU, according to 2025 Zillow research on the Atlanta metro.

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Cost Disclaimer: All cost ranges and estimates are approximations based on industry contractor data, published reports, and regional market research as of 2026. Actual ADU costs vary significantly based on lot conditions, city requirements, contractor selection, material specifications, and design complexity. Georgia has no statewide ADU law — rules vary entirely by city and zoning district, and HB 1166 remains pending as of this writing. Always verify current zoning and permit requirements directly with your local authority before beginning design. Always obtain a minimum of three contractor bids before committing to a project budget. Last updated June 2026.