What are the tiny house laws in New Mexico?

New Mexico allows a tiny house on a permanent foundation under its building code¹. Your dwelling must have permanent facilities for living, sleeping, eating, cooking and sanitation¹. The New Mexico Residential Building Code and its tiny-house Appendix AQ govern this construction within Construction Industries Division jurisdiction¹.

Imported tiny houses need inspection to meet New Mexico residential requirements, just as houses built in the state do¹. Ask CID which inspections your builder must arrange before you order a finished unit¹. Ask the county planning office separately whether your parcel allows the dwelling use you propose⁷.

New Mexico's 400-square-foot limit defines the maximum tiny-house size, excluding lofts¹. A sleeping or living loft needs at least 35 square feet and at least 5 feet in every horizontal dimension³. Those loft measurements do not set a minimum size for your entire dwelling³.

New Mexico also sets ceiling heights for tiny houses¹. Your habitable rooms and hallways need at least 6 feet 8 inches¹. Bathrooms, toilet rooms and kitchens need at least 6 feet 4 inches, with lower ceilings allowed in lofts¹. Sloping ceilings can reduce the loft area that counts toward the minimum³. Ask CID to review your loft drawing before you settle on a floor plan³.

New Mexico treats a tiny house on a chassis with a permanent axle as an RV while the axle remains¹. Your unit must meet RV codes and licensing requirements¹. If you remove the axles and place the unit on foundation supports, New Mexico's code requirements for a permanent-foundation tiny house apply¹.

Local RV occupancy rules differ: 8 counties allow it, 1 permits temporary use only, and 4 allow limited use⁸. RV occupancy remains unconfirmed in 20 counties⁸. Use the New Mexico RV-living list to narrow your search, then ask the county planning office about your address and planned stay⁸.

Your New Mexico dwelling does not get a building-permit exemption just because it is tiny⁴. You need a building permit before covered residential construction begins⁴. The small-accessory-building exception covers specified shed, storage and similar uses up to 120 square feet⁴. That exception does not give you permission to live in a shed⁴.

CID building-permit fees depend on construction type, square footage, materials and construction cost⁵. Ask CID for a fee estimate for your project; floor area alone is not enough to budget⁵. Electrical, plumbing and mechanical systems can need separate permits even when a building-permit exception applies⁴. You can also apply for a CID building permit online⁹.

New Mexico county permissions cover different uses; check yours before relying on a yes². For unincorporated land, Cibola County, McKinley County and Otero County have no county zoning restriction on tiny-home occupancy². Grant County, Sierra County and Quay County also allow tiny-home occupancy under zoning². New Mexico construction and septic requirements still apply^1,6.

Santa Fe County addresses tiny houses as short-term rentals in legally permitted residences². That does not let you place a new tiny home anywhere in Santa Fe County². Rio Arriba County distinguishes placement on permanent and non-permanent foundations². Check local conditions in the New Mexico tiny-home list².

You may need septic approval before your tiny house arrives⁶. If your New Mexico lot needs an on-site wastewater system, NMED must issue the septic permit before dwelling construction or delivery⁶. Ask the NMED district field office serving your property about septic permits¹⁰. A small house still has to meet that wastewater requirement⁶.

Public sewer availability can change your plan⁶. Your dwelling must connect if it uses an on-site system, sewer is available and the local authority requires connection⁶. Ask that authority about sewer connection before you choose a septic layout⁶.

Your backyard tiny house needs a separate land-use answer. We could not confirm a uniform New Mexico authorization for accessory dwellings. Ask the county or municipal planning office whether your tiny house can serve as an additional residence.