ADU Rules in Abilene, Texas

Overview

Abilene is a West Texas city of approximately 125,000 people in Taylor County. It is home to Dyess Air Force Base — headquarters of the 7th Bomb Wing operating B-1 Lancer strategic bombers — and three universities: Abilene Christian University (ACU), Hardin-Simmons University (HSU), and Texas Tech University Health Sciences Center. The military and university institutions drive significant housing demand across Abilene's residential neighborhoods.

Texas has no statewide ADU preemption law. Abilene's zoning ordinance governs ADUs, but the Dyess AFB AICUZ overlay is the critical special consideration for many Abilene properties.

Dyess AFB AICUZ: Critical Overlay

The Air Installation Compatible Use Zone (AICUZ) around Dyess Air Force Base establishes noise contour zones and Accident Potential Zones (APZs) based on flight operations of B-1 Lancer bombers and training aircraft. These zones overlay portions of Abilene's residential areas, primarily in western and southwestern Abilene.

Noise Contour Zones

• 65–70 dB DNL: Noise-affected; residential construction discouraged; sound attenuation required for new units; disclosure at property sale recommended
• 70–75 dB DNL: High noise; new residential construction (including ADUs) strongly discouraged; may be prohibited in some zones
• 75+ dB DNL: Severe noise; new residential construction including ADUs is generally prohibited under DoD/AICUZ guidelines

Accident Potential Zones (APZ)

• Clear Zone: Immediately adjacent to runway ends; no development permitted
• APZ I: High accident potential; residential uses including ADUs are generally incompatible per Air Force AICUZ guidelines
• APZ II: Reduced but significant accident potential; residential density restrictions apply; new residential construction may be limited

Always verify your parcel's AICUZ zone with the Abilene Planning Department before planning an ADU. The city has incorporated AICUZ overlay designations into its zoning maps.

Joint Land Use Study (JLUS)

Taylor County and the City of Abilene participate in a Joint Land Use Study for Dyess AFB. The JLUS recommends land use compatibility policies for the area around the base, and Abilene incorporates these recommendations into its zoning code and development review processes. The JLUS document is available through the city or Dyess AFB.

Zoning Ordinance: ADU Provisions Outside AICUZ Zones

In areas not restricted by AICUZ overlays, Abilene's zoning ordinance governs ADUs in residential districts. Typical provisions:

• Detached accessory dwellings: Garage apartments, guest houses permitted in qualifying single-family districts
• Attached secondary units: Permitted in some residential districts as an addition or internal conversion
• Minimum lot size: A qualifying lot area threshold required before an ADU is permitted
• Maximum ADU size: Typically a percentage of primary dwelling square footage or a fixed cap
• Setbacks: Rear and side setbacks approximately 5 ft for accessory structures
• Height: One to one-and-a-half stories for most detached accessory structures

University Area Rental Demand

Abilene's three universities create year-round rental demand, particularly in neighborhoods near ACU, HSU, and the medical district. ADUs in eligible neighborhoods near universities can be attractive rental investments, provided they comply with zoning and are not restricted by AICUZ overlays.

West Texas Climate Considerations

Abilene's semi-arid climate with hot summers and periodic severe weather (including hail and occasional tornadoes) is relevant to ADU construction standards. West Texas construction should consider:

• Durable roofing materials suitable for hail exposure
• Adequate mechanical (HVAC) sizing for West Texas temperature extremes
• Wind resistance per Texas building code requirements

Permit Process

1. Verify zoning district and AICUZ overlay status with Abilene Planning & Development Services
2. If in an AICUZ zone, confirm ADU compatibility before proceeding
3. Prepare site plan, floor plans, and elevations
4. Submit building permit application to Abilene Building Inspections
5. Pay applicable fees; await plan review
6. Schedule inspections through certificate of occupancy

Contact

• Abilene Planning & Development Services: abilenetx.gov/departments/planning | 325-676-6228
• Abilene Building Inspections: abilenetx.gov | 325-676-6264
• Dyess AFB Public Affairs (AICUZ): dyess.af.mil

Disclaimer: AICUZ boundaries and zoning regulations are subject to change. This page reflects general guidance as of the date noted. Given the critical impact of the Dyess AFB AICUZ on portions of Abilene, always verify your parcel's overlay status directly with the City of Abilene Planning Department before investing in ADU design or construction.