ADU Rules in Fayetteville, AR (2026)

Fayetteville, AR permits accessory dwelling units (ADUs) on residential properties. ADUs — also called granny flats, in-law units, backyard cottages, or secondary suites — are secondary housing units on a single-family or multifamily lot. State and local law governs the approval process. In Fayetteville, the Fayetteville Development Services — Building Safety Division handles ADU permit applications. Below you will find the current size limits, setbacks, fees, and timeline for building an ADU in Fayetteville.

ADU Size Limits

ADU Size Limits in Fayetteville: Detached ADU: up to 1000 sq ft (max height: 25 feet). Attached ADU: 800 sq ft. Fayetteville ADU regulations under the UDC. Detached ADU limited to 1,000 sqft or 50% of principal dwelling floor area, whichever is less. JADU is a California-specific concept not applicable in Arkansas. Fayetteville's university context creates intense housing demand — ADUs serve graduate students, visiting faculty, and young professionals in the growing NWA tech sector.

Permit Fees

ADU Permit Fees in Fayetteville: Plan check fee: $100-$500. Building permit fee: Based on construction value — typically $600-$3,000. Impact fees: None. School fees: None or N/A. Total estimated permit cost: $700-$3,500 total permit fees. Fayetteville Building Safety fee schedule. No development impact fees in Fayetteville. Source: fayetteville-ar.gov/668/planning

Permit Timeline

Fayetteville ADU Permit Timeline: Fayetteville Development Services (Building Safety Division): ADU permits typically 3-6 weeks. Construction 2-7 months. Fayetteville's growing development activity means permit timelines can vary. Apply through the Fayetteville Development Services — Building Safety Division online permit portal. Phone: (479) 575-8220.

Setback Requirements

ADU Setback Requirements in Fayetteville: Front setback: follows zone standard. Side setback: 5 feet. Rear setback: 5 feet. Fayetteville rear yard setback for accessory structures is typically 5 ft from rear and side property lines. Fayetteville's Ozark hillside lots often have irregular shapes and slope constraints that affect setback measurements. Per Fayetteville UDC.

Parking Requirements

Parking Requirements: One parking space required per ADU. University of Arkansas proximity creates strong transit demand — Ozark Regional Transit provides limited bus service. Reduced parking requirements may apply in urban infill districts near the UA campus.

Restrictions & Requirements

• •ADU must comply with Fayetteville Building Code habitability standards
• •Detached ADU located in rear yard behind principal structure
• •Must maintain UDC setback requirements — hillside lots may have additional slope constraints
• •Hillside Development Standards apply to lots with 15%+ grade
• •Washington County/Fayetteville flood plain areas restrict construction near Mud Creek and others
• •University of Arkansas campus adjacency zones may have design compatibility standards

How Many ADUs Are Allowed?

Number of ADUs Allowed in Fayetteville: Single-family lots: 1 ADU per lot. Multifamily properties: Accessory units on multifamily parcels subject to site plan review. Fayetteville's university context and rapid Northwest Arkansas growth create unique ADU dynamics. The city has been exploring more permissive ADU standards to address housing affordability for the growing population. UA student enrollment and NWA corporate growth both drive housing demand.

Frequently Asked Questions