ADU Rules in Alamogordo, New Mexico

Alamogordo, the county seat of Otero County, is situated at the base of the Sacramento Mountains in south-central New Mexico. The city lies immediately east of Holloman Air Force Base (home to the 49th Wing, Air Education and Training Command) and is the gateway to White Sands National Monument — the world's largest gypsum dune field.

ADUs in Alamogordo are regulated by the city's local Zoning Ordinance, administered by the Planning & Zoning Department. New Mexico has no statewide ADU preemption law. A critical consideration in Alamogordo is the Holloman AFB AICUZ program, which creates noise and safety overlays over parts of the city.

Permitted ADU Types

Alamogordo's zoning code generally permits residential accessory dwelling units in qualifying zone districts, including:

• Detached ADU: A separate structure on the same lot as the primary dwelling
• Attached ADU: An addition to the primary dwelling with a separate entrance
• Interior Conversion: Conversion of an existing garage or interior space

Eligible zone districts, minimum lot sizes, and dimensional standards should be confirmed with the Planning & Zoning Department.

Size and Dimensional Standards

Verify current standards directly with the Alamogordo Planning & Zoning Department.

Holloman AFB AICUZ — CRITICAL OVERLAY

Holloman Air Force Base is located directly west of Alamogordo, and the base's flight patterns and operations affect much of the city's western and central areas. The AICUZ program establishes:

• Noise Contour Zones: Areas exposed to 65 dB, 70 dB, and 75+ dB Day-Night Average Sound Level (DNL) from aircraft operations
• Accident Potential Zones (APZ I and APZ II): Zones along runway approach/departure corridors where certain land uses — including new residential construction — are considered incompatible or restricted

Properties in the highest noise zones (70+ dB DNL) or within APZ I/II may be restricted from new residential ADU construction. Even in lower noise zones, sound attenuation construction requirements may apply to new dwelling units.

Action required: Before planning an ADU in Alamogordo, verify whether your property falls within any AICUZ noise contour or APZ zone. The Alamogordo Planning & Zoning Department should have the current AICUZ overlay incorporated in the zoning maps.

White Sands Missile Range Proximity

White Sands Missile Range (WSMR), adjacent to White Sands National Monument, is a major federal military installation. Occasional WSMR test activities may require temporary airspace or highway closures (US-70 between Alamogordo and Las Cruces is sometimes closed). This does not directly affect zoning, but is relevant context for living in the area.

Sacramento Mountains and Topography

The Sacramento Mountains rise steeply east of Alamogordo, with the resort community of Cloudcroft at approximately 9,000 ft elevation just 16 miles away. The strong elevation gradient creates varied weather patterns. Alamogordo itself sits at approximately 4,300 ft — a relatively mild climate compared to higher-elevation New Mexico cities.

Permit Process

1. Verify AICUZ overlay status: Check city zoning map or contact Planning & Zoning for AICUZ zone designation on your parcel
2. Confirm zone district: Verify residential zone and permitted uses
3. Pre-application consultation (recommended): Discuss requirements with city staff
4. Submit application: File with required site plan and building drawings
5. Building permit: Apply after zoning clearance
6. Inspections and certificate of occupancy

Contact Information

• Alamogordo Planning & Zoning: (575) 439-4100 | ci.alamogordo.nm.us
• Holloman AFB Community Relations: holloman.af.mil

Disclaimer

Zoning regulations and AICUZ designations change frequently. This summary is based on publicly available sources as of April 2026 and is for informational purposes only. AICUZ maps are subject to revision based on military operations. Always verify current zoning rules with the City of Alamogordo Planning & Zoning Department and current Holloman AFB AICUZ maps. Consult a licensed New Mexico professional before making construction or investment decisions.