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)

HUD FY2026Adopted rent benchmark

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 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

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Attached ADU

$80K – $200K

Shares one wall; 20–35% less than detached

🔗

Garage Conversion

$35K – $90K

Most affordable; uses existing structure

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Basement Conversion

$40K – $95K

Common in Fulton County's hilly terrain

⬇️

Modular / Prefab

$85K – $190K

Fastest construction timeline

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Local control: Local rules control. No broad statewide ADU siting mandate was identified in this review. City, county, zoning, building, utility, and site rules control. Permit fees and review timing remain planning estimates until confirmed for the specific property.

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.

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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

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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

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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

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Current ADU Legal Framework

No broad statewide ADU siting mandate was identified in this review. City, county, zoning, building, utility, and site rules control.

Local control · Local rules control

Homeowners reviewing ADU permit documents

Permits & Fees

What permitting actually costs.

No broad statewide ADU siting mandate was identified in this review. City, county, zoning, building, utility, and site rules control. The detailed figures below are representative planning ranges, not a statewide fee schedule or review-time guarantee.

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Building Permit Fee — Atlanta

$2,400 – $4,000

Review timeline 55–90 days for straightforward projects.

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Building Permit Fee — Other Cities

$500 – $2,000

Varies significantly by city and project value.

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Utility Connection Fees

$3,000 – $18,000

Georgia Power meter connection alone typically runs $4,000–$5,000.

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Impact / Development Fees

$2,000 – $4,000

Common in Atlanta; less consistent in other jurisdictions.

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Permit Review Timeline

4 – 13 weeks

Atlanta runs longer at 55–90 days; smaller cities are often faster.

Verified August 5, 2026 · Local control

Local rules control

No broad statewide ADU siting mandate was identified in this review. City, county, zoning, building, utility, and site rules control.

Legal classificationLocal control

Governing frameworkLocal rules control

Representative permit fees$500 – $2,000

Representative review time4 – 13 weeks

Local verificationRequired

Source: NationwideADU 51-jurisdiction law directory →

Verify the property before design

These are planning benchmarks, not a permit quote, eligibility ruling, or legal opinion. Confirm zoning, building, utility, site, private-covenant, fee, and timing requirements with the current local authorities. See the 51-jurisdiction law directory and national permit guide.

Return on Investment

Georgia ROI planning inputs.

$925–$1,525

Adopted statewide 1-bedroom rent range

15%

National property-value planning input

10%–20%

Property-value uncertainty range

30%

Operating-expense planning reserve

Rent source

HUD FY2026 revised

One-bedroom FMR market basket

Exact HUD mappings

ROI-CM-1.4

Home-value source

Statewide Zillow ZHVI

June 30, 2026

One statewide input

Not a valuation

Payback period

Calculated live

Budget, ADU type, size and rent

Open calculator →

No static statewide promise

Full methodology

Transparent sources

HUD, Census PUMS, Zillow and FHFA

Review methodology →

Planning estimate, not a valuation

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 →

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Compact Detached ADU

Georgia — statewide range

Property-Value Planning Input

15%

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

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

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

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

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

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

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. NationwideADU's August 5, 2026 review classifies Georgia as local control; no broad statewide ADU siting mandate was identified.

Does Georgia have a statewide ADU law?

NationwideADU's August 5, 2026 review classifies Georgia as local control; no broad statewide ADU siting mandate was identified. No broad statewide ADU siting mandate was identified in this review. City, county, zoning, building, utility, and site rules control. Local zoning, building, utility, site, and private-covenant requirements may still apply; verify the current rules for the property before design or construction.

How long does it take to get an ADU permit in Georgia?

The representative ADU permit-review planning timeline for Georgia is 4 – 13 weeks. This is not a statewide deadline or guarantee. Timing can change with the local authority, project complexity, corrections, utilities, site conditions, and application completeness; confirm the current timeline locally.

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?

The representative ADU permit-fee planning range for Georgia is $500 – $2,000. This is not an official statewide fee schedule or quote. Plan review, utility, impact, site, and other local charges may be additional; request a current itemized estimate from the permitting authority.

What is the ROI on an ADU in Georgia?

The adopted Georgia one-bedroom planning range is $925–$1,525 per month, derived from the HUD FY2026 revised FMR market basket under ROI-CM-1.4. Payback is calculated from the homeowner's budget, ADU type, size, rent range, and a 30% operating-expense reserve. Property value uses a 15% national planning input with a 10%–20% uncertainty range; it is not a valuation.

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Planning Disclaimer: Cost, fee, and timeline ranges are approximations for education and early planning; actual requirements and costs vary with the property, local authority, utilities, site conditions, design, and contractor. The Georgia legal classification and framework shown here were verified on August 5, 2026, but they do not determine parcel eligibility and are not legal advice. Confirm current zoning, building, utility, private-covenant, fee, and timing requirements directly with the applicable authorities before design or construction. Obtain at least three contractor bids before committing to a project budget. Last updated August 2026.