2026 Cost Guide · Updated September 2026

ADU Cost in Arkansas — Little Rock, Fayetteville, Fort Smith & Statewide

Arkansas offers some of the most affordable ADU construction in the South. City-by-city cost data across Little Rock, Fayetteville, and Fort Smith — built from permit records, contractor data, and regional labor rates.

$58K–$198K Detached ADU range

$36K–$98K Garage conversion (lowest cost)

HUD FY2026Adopted rent benchmark

No state law Rules set city-by-city

ARKANSAS
ADU Collection

Beautiful. Functional. Built for Arkansas Living.

🏠Increase Property Value

💲Generate Rental Income

👥Multi-Generational Living

🌿Sustainable Design

Arkansas 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.

Arkansas ADU exterior at twilight, warm interior light glowing

Arkansas ADU and main house evening backyard view

Aerial view of Arkansas property with backyard ADU

At a Glance

Arkansas ADU costs — by type.

Detached ADU

$58K – $198K

$95–$245 per sq ft · Fayetteville skews highest

🏡

Attached ADU

$56K – $165K

Common for multigenerational additions statewide

🔗

Garage Conversion

$36K – $98K

Among the most cost-effective ADU options in Arkansas

🚗

Basement Conversion

$38K – $115K

More common in Ozark-region homes than South Arkansas

⬇️

Modular / Prefab

$50K – $150K

Faster, weather-predictable build timeline

📦

💡

Effective framework: Act 313 of 2025. Cities and incorporated towns must allow at least one ADU on qualifying single-family lots, subject to the act and local code. 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

$58K – $198K

Freestanding backyard structure. Arkansas's generous lot sizes and low labor costs make backyard construction straightforward statewide. Fayetteville/NW Arkansas pushes toward the top of this range; Fort Smith toward the bottom.

Detached ADU Guide →

02 / Most Affordable

Garage Conversion

$36K – $98K

Conversions cost 40–55% less than a comparable detached new-construction ADU while generating similar rental income in most Arkansas markets. Always evaluate conversion potential before committing to ground-up construction.

Garage Conversion Guide →

03 / Weather-Predictable

Modular / Prefab

$50K – $150K

Factory-built construction offers a faster, more predictable timeline than custom stick-built projects, with less exposure to weather delays during Arkansas's humid spring and summer months.

Prefab ADU Overview →

04 / Multigenerational

Attached ADU

$56K – $165K

A common choice for multigenerational households and lots where backyard depth limits detached construction. Shares a wall with the primary residence, reducing some site-work costs versus a fully detached build.

Attached ADU Guide →

05 / Region-Dependent

Basement Conversion

$38K – $115K

More viable in the Ozark region and Northwest Arkansas, where many homes already have basements suited for conversion. Less common in South Arkansas, where slab-on-grade construction predominates.

Basement ADU Guide →

Cost by Region

Every Arkansas market is different.

Fayetteville / NW Arkansas

Bentonville · Rogers · Springdale

$72K–$198K

$108–$245 per sq ft

Highest cost

Little Rock / Pulaski County

North Little Rock · Maumelle

$62K–$168K

$93–$214 per sq ft

Moderate

Fort Smith / Sebastian County

Van Buren · Barling

$58K–$148K

$87–$188 per sq ft

Most affordable

Cost Factors

Why Arkansas ADUs cost what they cost.

👷

Labor Rates

Arkansas construction labor is among the lowest nationally, reflecting a lower cost of living and competitive regional contractor market compared to most Southern states.

Among lowest nationally

❄️

Shallow Frost Depth

Arkansas's frost depth of 12–18 inches keeps foundation costs lower than in colder Midwest and Northeast states, where deeper footings are required.

12–18 inch frost depth

🏢

Corporate-Driven Demand

Walmart HQ, Tyson Foods, and the University of Arkansas concentrate rental demand in the Fayetteville-Bentonville corridor, pushing costs and rents higher there than the rest of the state.

Fayetteville commands premium

⚖️

Current ADU Legal Framework

Act 313 (approved March 18, 2025) requires every city and incorporated town to allow at least one ADU by right, capped at 75% of the primary home's floor area or 1,000 sq ft, subject to the act and local code.

Effective framework · Act 313 of 2025

Homeowners reviewing ADU permit documents

Permits & Fees

What permitting actually costs.

Cities and incorporated towns must allow at least one ADU on qualifying single-family lots, subject to the act and local code. The detailed figures below are representative planning ranges, not a statewide fee schedule or review-time guarantee.

📄

Building Permit Fee

$500 – $3,500

Varies significantly by city and project value.

🏗️

Plan Check / Review Fee

Included or 65% of permit fee

Some jurisdictions combine this with the base permit fee.

💧

Utility Connection Fees

$3,000 – $18,000

Water, sewer, and electrical connections. Varies widely by municipality.

🧾

Impact / Development Fees

$0 – $8,000

School, park, and transportation fees where applicable — not charged in every city.

⏱️

Permit Review Timeline

3 – 9 weeks

First-round corrections add 2–6 weeks per round in most Arkansas cities.

Verified September 17, 2026 · Effective framework

Act 313 of 2025

Every city and incorporated town must allow at least one ADU by right (75% of the primary home's floor area or 1,000 sq ft cap) on qualifying single-family lots, subject to the act and local code.

Legal classificationEffective framework

Governing frameworkAct 313 of 2025

Representative permit fees$500 – $3,500

Representative review time3 – 9 weeks

Local verificationRequired

Source: Arkansas Legislature — Act 313 →

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

Arkansas ROI planning inputs.

$675–$1,025

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
Arkansas ADU cost now.

Arkansas 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

Arkansas — statewide range

Property-Value Planning Input

15%

Convert before you build new

If your property has a qualifying garage or basement, conversions cost 40–55% less than a comparable detached new-construction ADU while generating similar rental income in most Arkansas markets. Always evaluate conversion potential before committing to ground-up construction.

Saves 40–55% vs. new construction

Get a minimum of three contractor bids

Contractor pricing for ADU projects in Arkansas varies 20–35% for equivalent scope. Getting three bids from contractors with ADU permit experience in your specific city is the single most reliable way to avoid overpaying.

Prevents overpaying by 20–35%

Start design during permit review

Begin contractor research during the permit review period — not after approval. Experienced ADU contractors in active Arkansas markets book 2–4 months in advance. Starting early means you can break ground the day your permit arrives.

Cuts weeks off total project timeline

Right-size for your market's rent ceiling

In most Arkansas markets, a 600–700 sq ft 1-bedroom ADU commands rents close to a 900 sq ft 2-bedroom — at significantly lower construction cost. Size your ADU to the market's rent curve, not the maximum allowed square footage.

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 financing option can save thousands over the life of the project.

Can save $10,000–$40,000 over project life

Verify your city's zoning and size limits first

Little Rock, Fayetteville, and Fort Smith each set their own ADU size caps and owner-occupancy rules. A 30-minute call to your local planning department prevents thousands in wasted design fees on a project that doesn't fit local code.

Prevents wasted design fees

Consider modular where local labor is tight

Factory-built construction can be cost-competitive in Arkansas markets where ADU-specialist contractors are less concentrated, offering a faster and more weather-predictable build timeline than custom stick-built.

Often faster than custom stick-built

Frequently Asked Questions

Arkansas ADU answers.

How much does an ADU cost in Arkansas?

ADU costs in Arkansas typically range from $58,000 to $198,000 for a detached unit, with cost per square foot from $87 to $245. Fayetteville and Northwest Arkansas are the most expensive markets, driven by Walmart HQ, Tyson Foods, and University of Arkansas growth. Fort Smith is the most affordable.

Does Arkansas have a statewide ADU law?

Yes. Act 313 of 2025 (HB 1503), sponsored by Reps. Clowney, Painter, Gonzales, B. McKenzie, and J. Richardson with Sen. Hester as Senate sponsor, was approved March 18, 2025. It requires every city and incorporated town to allow at least one ADU by right — without special permits or public hearings — on any single-family residential lot. Municipalities had until January 1, 2026 to bring their zoning codes into compliance. Local zoning, building, utility, site, and private-covenant requirements may still apply; verify the current rules for the property before design or construction.

What does Arkansas's Act 313 ADU law require?

Act 313 caps ADU size at 75% of the primary home's gross floor area or 1,000 sq ft, whichever is smaller, and permits attached, detached, and internal ADUs. Cities cannot require additional off-street parking, and both development impact fees and application review fees are capped at $250. Owner-occupancy is not required, and the act does not override private neighborhood covenants or preempt local short-term rental rules. Little Rock adopted its compliant ordinance in August 2025 after a contentious public-comment process.

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

The representative ADU permit-review planning timeline for Arkansas is 3 – 9 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 Fayetteville the best market for an Arkansas ADU?

Fayetteville and the surrounding Northwest Arkansas corridor generally produce the strongest rental returns in the state, driven by Walmart HQ, Tyson Foods, and University of Arkansas demand — but construction costs there are also the highest statewide. Little Rock and Fort Smith offer lower build costs with correspondingly lower rents; run the numbers for your specific market before deciding.

What is the cheapest ADU to build in Arkansas?

Garage conversions are the least expensive option, typically $36,000–$98,000. Conversions cost 40–55% less than a comparable new-construction detached ADU while generating similar rental income in most Arkansas markets.

How much are ADU permit fees in Arkansas?

The representative ADU permit-fee planning range for Arkansas is $500 – $3,500. 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 Arkansas?

The adopted Arkansas one-bedroom planning range is $675–$1,025 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.

Ready to find out what your ADU will actually cost?

Start with the ROI calculator. Free, no signup, no contractor pitch. Just the data.

Calculate My ROI → All 50 State Guides

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 Arkansas legal classification and framework shown here were verified on September 17, 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 September 2026.