Doña Ana County's Building Services Division at 845 North Motel Boulevard in Las Cruces (575-647-7350, buildingservices@donaana.gov) issues building, electrical, plumbing, mechanical and manufactured-home permits and inspects construction in the unincorporated county, the second most populous in New Mexico, running from the Mesilla Valley south to the Mexican border. The state codes the Construction Industries Division adopts apply, with the county administering them outside the incorporated municipalities.
The county's distinguishing feature is its colonias — unincorporated settlements, many along the border and in the valley, that grew up without full water, sewer or paved access and in some cases without conforming subdivision. Building on such a parcel raises questions of legal access, potable supply, wastewater disposal and sometimes the legitimacy of the lot itself, all of which precede the building code. The Mesilla Valley's acequia network crosses much of the rest of the county's usable land.
This guide covers unincorporated Doña Ana County. Las Cruces, Mesilla, Sunland Park, Anthony and Hatch permit their own construction; the Mexican border runs along the county's southern edge and is not a permitting boundary the county administers.
Colonia parcels start with access and water. Many unincorporated settlements in Doña Ana County developed without full water, sewer or paved access, and in some cases without conforming subdivision. On such a parcel the questions of legal access, potable supply, wastewater disposal and the lot's own standing come before the building code — and they can determine whether a permit is possible at all.
What requires a building permit in Doña Ana County?
In Doña Ana County the practical questions are which authority issues the permit, whether local amendments apply, and the county's zoning and its unserved settlements.
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- Construction, alteration, relocation, enlargement, replacement, repair, change of occupancy or demolition in unincorporated territory
- Zoning and subdivision approval from the county ahead of the building permit
- Potable water supply and on-site liquid waste approval where the parcel is unserved
- New buildings, additions and structural work, under the commercial or residential code as applicable
- Alteration, relocation, enlargement, replacement and repair of a building or structure
- Any change of use or occupancy, which brings the existing building code into the analysis
Often exempt
- Minor repairs, and the small items the state permit rule (14.5.2 NMAC) lists as exempt
- Minor repairs, such as replacing a lamp or fixing a faucet
- Swings and other playground equipment at a house
- Small accessory structures below the threshold — zoning and any local amendment still apply
Local building departments and what they change
Doña Ana County's layer is therefore its status, any amendments it has adopted, its zoning and platting, its fee schedule, and the colonias and unserved settlements, and the acequia network across the Mesilla Valley.
New Mexico adopts its building codes statewide; a city or county with its own certified building official issues its own permits, and elsewhere the state Construction Industries Division does. New Mexico rules
Who handles permitting in Doña Ana County?
The county's Building Services Division, in the Community Services group, issues building and trade permits and inspects in unincorporated Doña Ana County, administering the state code alongside the county's zoning and subdivision regulation. Las Cruces and the other municipalities permit their own, and the Construction Industries Division licenses contractors statewide.
| Detail | Information |
|---|---|
| Department | Doña Ana County Building Services Division (Community Services) |
| Office | 845 North Motel Boulevard, Building D, Las Cruces, NM 88007 |
| Phone | (575) 647-7350 |
| Scope | Unincorporated Doña Ana County |
| Codes | State codes at 14.7 NMAC, 2021 I-codes as amended |
| Contractor licensing | Construction Industries Division, statewide |
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Residential permits
A house in unincorporated Doña Ana County is permitted by the county against the New Mexico Residential Building Code as amended, with zoning and subdivision cleared first. On an unserved parcel the water supply and liquid waste approvals are the gating items, and on a colonia parcel the legal access and the lot's subdivision standing need establishing before design money is spent.
Commercial permits
Commercial and industrial work in unincorporated Doña Ana County — the Santa Teresa border industrial park and the agricultural processing along the valley — clears the county's zoning and site development, then plan review against the New Mexico Commercial Building Code, with cross-border logistics development carrying its own federal and state coordination.
Which authority issues the permit
In unincorporated Doña Ana County the Rio Grande floodplain and the Mesilla Valley acequias govern the irrigated land, the colonias raise access and service questions across many settlements, and White Sands Missile Range occupies a large part of the county's east as federal land.
New Mexico licenses contractors at state level through the Construction Industries Division, in classifications tied to a qualifying party. New Mexico rules
Doña Ana County permit costs and fees
Fees follow the county's schedule for unincorporated territory, with water and waste approvals charged separately and contractor licensing charged by the state.
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Call 1-855-478-4290 →| Item | Fee or rule |
|---|---|
| Building permit | The county's fee schedule, for unincorporated territory |
| Zoning and subdivision | County approval ahead of the permit |
| Water and liquid waste | Separate approvals where the parcel is unserved |
| Trade permits | Electrical, mechanical and plumbing permits issued by the county Building Services Division, for state-licensed contractors |
| Contractor licence | Issued by the Construction Industries Division, valid statewide |
| City permits | Las Cruces, Mesilla, Sunland Park, Anthony and Hatch issue their own |
Establish the lot before the design. On a colonia parcel the binding question is often whether the lot was lawfully created and whether legal access exists — not what may be built on it. Those are subdivision and title matters, they are answered by the county and the records rather than by a designer, and they belong before any drawing is commissioned.
Trade permits and who may pull them
Permit required
- Unserved parcels — potable water and on-site liquid waste approvals before the building permit
- Electrical — state-licensed electrical contractor; separate permit and inspection
- Mechanical — state-licensed mechanical contractor; separate permit, covering heating, cooling and refrigeration
- Plumbing — state-licensed plumbing contractor; separate permit under the New Mexico Plumbing Code. Natural gas piping needs a gas-fitting licence and follows the New Mexico Mechanical Code
- Liquefied petroleum gas work, which the division regulates separately
Typically exempt
- Building, plumbing or electrical work a homeowner does on their own primary residence under a homeowner permit; heating, cooling and gas work need a licensed contractor
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Get a free quote →Electrical, mechanical and plumbing work is permitted separately and done by contractors holding the matching state licence. New Mexico rules
How to apply for a Doña Ana County building permit
A city or county with its own certified building official issues its own permits; elsewhere the Construction Industries Division does it directly.
Zoning and platting are always handled by the city or county, not by the division.
A city or county with its own building department may adopt local rules stricter than the state codes, which are the minimum.
The division licenses contractors statewide in the classification matching the work.
The commercial code, the residential code or the existing building code, depending on the building and the work.
Footing to final with the authority that issued the permit, then the certificate of occupancy.
Review, corrections and what actually causes delay
Doña Ana County reviews unincorporated work against the state code. What delays a file here is a colonia parcel whose access or subdivision standing was assumed, a water or waste approval started late, and an acequia easement discovered after siting.
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Inspections follow the adopted codes' sequence — footing, foundation, framing, rough trades, insulation and final — and are requested from whichever authority issued the permit, with the trades inspected on their own permits. Work that passes final receives a certificate of occupancy for new buildings and changes of occupancy. Doña Ana County inspects the work it permits in the adopted codes' sequence, with the trades inspected on their own permits; inside the municipalities, inspection is theirs.
Doña Ana County permit search and official resources
- Doña Ana County — the county government and its Building Services Division
- New Mexico Construction Industries Division — the statewide codes and contractor licensing
- 14.7.3 NMAC — New Mexico Residential Building Code — the 2021 International Residential Code as amended by the state
- New Mexico Construction Industries Division — the statewide codes, contractor licensing and the division's own permitting
- 14.7.2 NMAC — New Mexico Commercial Building Code — the 2021 International Building Code as amended by the state
- 14.7.3 NMAC — New Mexico Residential Building Code — the 2021 International Residential Code as amended by the state
Inspections are where schedules slip.
Get a free quote →Frequently asked questions
What is a colonia?
An unincorporated settlement that developed without full water, sewer or paved access, and sometimes without conforming subdivision. Doña Ana County has more of them than any other New Mexico county.
Can I build on a colonia parcel?
Often yes, but the legal access, water supply, wastewater disposal and the lot's subdivision standing must be established first — and they can determine whether a permit is possible.
Does the county permit inside Las Cruces?
No. Las Cruces and the other municipalities permit their own construction; the county covers unincorporated territory.
Which code applies?
The state code adopted by the Construction Industries Division, on the 2021 International Codes as amended.
Who licenses my contractor?
The Construction Industries Division, at state level, valid throughout New Mexico.
What are acequias?
Traditional irrigation ditches crossing much of the Mesilla Valley's land, carrying easements and access rights that constrain siting.
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In Doña Ana County the lot's standing and its services decide the project before the code does. We establish both from the records and the county before any design is commissioned.
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More New Mexico permitting guides
More New Mexico permitting guides
This guide is provided by Alliance Permitting for general information about Doña Ana County permitting. Requirements, fees, and procedures change; confirm details with the permitting authority before relying on them.