ADU Rules in Los Lunas, New Mexico

Los Lunas, the county seat of Valencia County, is one of New Mexico's fastest-growing communities. Situated on the Rio Grande approximately 20 miles south of Albuquerque along the I-25 corridor, Los Lunas has experienced rapid suburban growth driven by Albuquerque metro expansion. The village retains its designation as a "Village" under New Mexico municipal law despite its growing population and urban character.

ADUs in Los Lunas are regulated by the village's local Zoning Ordinance, administered by the Planning & Zoning Department. New Mexico has no statewide ADU preemption law, so all rules are local. Rapid growth means the zoning code is amended frequently — always verify current rules directly with the village.

Permitted ADU Types

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

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

Permitted types and dimensional standards vary by zone district. Confirm with the Planning & Zoning Department for your specific parcel.

Size and Dimensional Standards

Confirm exact current requirements with the Village of Los Lunas Planning & Zoning Department.

Rio Grande Floodplain

The Rio Grande is a defining geographic feature of Los Lunas, flowing along the community's western edge. FEMA floodplain designations affect areas along the river corridor:

• Properties in Zone AE (Special Flood Hazard Area — 1% annual chance flood) require a floodplain development permit for any new construction, including ADUs
• Structures in the SFHA must be elevated to or above the Base Flood Elevation (BFE)
• Properties in Zone X (shaded) face moderate flood risk; review carefully
• The Rio Grande Bosque (cottonwood riparian forest) along the river banks has environmental protections

Use FEMA's Flood Map Service Center (msc.fema.gov) to determine your parcel's flood zone designation. For properties near the river, contact the Village floodplain administrator before designing an ADU.

Subdivision and HOA Considerations

Los Lunas contains many newer master-planned subdivisions with active HOAs and CC&Rs. As in Rio Rancho and other fast-growing NM communities, HOA restrictions may prohibit or limit ADU construction beyond what the village's zoning allows. Review your HOA documents and CC&Rs before applying for a permit.

Growth and Infrastructure

Rapid growth in Los Lunas means new infrastructure (water lines, sewer extensions, roads) is being built in many areas. Some newer subdivisions may have infrastructure not yet fully built out. Confirm that municipal water and sewer service is available and has adequate capacity for your parcel before planning an ADU. Some outlying areas may still rely on septic systems.

Water Considerations

New Mexico water scarcity is relevant to all new construction. Los Lunas Utilities or Valencia County Water Authority provides water service depending on location. Verify service provider and capacity for your parcel.

Permit Process

1. Check flood zone status: Review FEMA maps for your parcel at msc.fema.gov
2. Confirm zone district: Use village GIS map or contact Planning & Zoning
3. Review HOA documents: Check CC&Rs if your subdivision has an HOA
4. Pre-application consultation (recommended): Contact Planning & Zoning staff
5. Submit applications: File zoning/planning and floodplain permits as required
6. Building permit: Apply after clearances obtained
7. Inspections and certificate of occupancy

Contact Information

• Los Lunas Planning & Zoning: (505) 839-3800 | loslunasnm.gov/departments/planning
• Village of Los Lunas: loslunasnm.gov

Disclaimer

Zoning regulations change frequently, particularly in fast-growing communities. This summary is based on publicly available sources as of April 2026 and is for informational purposes only. Always verify current rules with the Village of Los Lunas Planning & Zoning Department, check FEMA flood maps for your parcel, and review your HOA documents. Consult a licensed New Mexico professional before making construction or investment decisions.