Building permits, zoning and septic rules in Eddy County, New Mexico

A residential building permit is required for work in Eddy County covered by the New Mexico Residential Code, and the New Mexico Construction Industries Division (CID) issues the permit for unincorporated areas because Eddy County has no local building department¹. Covered residential construction follows the 2021 New Mexico Residential Building Code, while energy, electrical, plumbing, mechanical and other requirements may also apply¹¹. A homeowner permit is available for the owner's primary residence, but not for rental, other owned or commercial property⁷. A homeowner permit application must be signed by the homeowner, along with a notarized Homeowner's Responsibilities Form¹. A homeowner must request inspections and correct violations, and licensed contractors must obtain permits and pass inspections for subcontracted work⁷. A homeowner permit cannot be used when a GB-2 or GB-98 contractor manages or supervises the project, and it does not cover HVAC, natural-gas or LP-gas installation⁷.

There is no Eddy County building department: the New Mexico Construction Industries Division issues residential building permits for unincorporated Eddy County, and the Las Cruces District Office is at 505 South Main Street, Las Cruces, NM 88001, phone 575-524-6320^1,12. A homeowner submission requires county planning and zoning approval, two complete sets of plans and the Multi-Purpose State Building Application². CID calculates the building-permit fee after receiving the project's total cost and will not process the request until the fee is paid². CID says a complete homeowner package is issued within 5 working days and residential permits are generally processed in 3 to 4 working days². Eddy County Planning & Development is at 101 W Greene Street, Suite 228, Carlsbad, NM 88220, phone 575-887-9511¹³. Applications may also be completed through CID's online permitting portal¹⁴.

Eddy County regulates land use through its Land Use ordinance and Subdivision Regulations, but county ordinances are not effective inside incorporated municipalities^3,6. A parcel inside a city follows that city's land-use process instead; for example, every property inside Artesia is zoned, and some zoning requests go through staff review, the Planning and Zoning Commission and the City Council³. A city decides zoning approval for its own parcels, but septic permits there still come from the New Mexico Environment Department⁴. Eddy County Planning & Development handles the county process for land outside those municipal boundaries^6,13. The county office also administers ordinances concerning manufactured-home placement, floodplain management, workforce camps and recreational-vehicle parks¹³. We could not confirm a county zoning-district map or the specific setback and minimum-lot-size rules for a rural parcel, so ask Planning & Development at 575-887-9511 before fixing a site plan¹³.

Septic (on-site liquid waste) systems in Eddy County are permitted and inspected by the New Mexico Environment Department rather than the county, and applications go to NMED's Carlsbad field office at 406 N Guadalupe, Suite C, Carlsbad, NM 88220, phone 575-885-9023^4,15. The application must include the required site, sizing, materials, soil, geological and hydrological information⁵. A small conventional system with design flow up to 1,000 gallons per day has a $225 permit fee, but NMED says to pay only after it approves or conditionally approves the permit⁵. Request the NMED inspection 48 hours, or 2 business days, in advance and do not cover the system before it is inspected⁵. Only 27.2% of Eddy County's soils rate free of severe limits for a conventional septic drain field, so plan on a site evaluation and possibly an engineered system⁸. New Mexico also lets a homeowner install a simple conventional septic system after passing a qualification test¹⁴.

Eddy County has its own Work Force Camps and Recreational Vehicle Parks Ordinance, but that ordinance governs RV parks and workforce camps as a land use, not whether you personally can park and live in a single RV on your own parcel, so don't read it as an answer to that question¹³. A tiny house of up to 400 square feet, excluding lofts, may be used as a single dwelling when it provides complete living facilities, meets the New Mexico Residential Code, passes inspection and sits on a permanent foundation⁹. A tiny house on a chassis with its permanent axle still attached is treated as an RV and must meet RV codes and licensing; removing the axles and placing the unit on supports or a foundation brings it under the permanent-foundation tiny-house requirements⁹. A manufactured home needs its own state installation permit before occupancy, and Eddy County has a separate Manufactured Home Placement ordinance^13,16. We could not confirm Eddy County's rule on long-term RV occupancy on a private rural parcel; ask Planning & Development at 575-887-9511 before buying¹³.

1. For unincorporated land, get planning and zoning approval from Eddy County Planning & Development at 575-887-9511; inside a municipality, start with that city instead^2,3,13.
2. Prepare two complete sets of plans and the Multi-Purpose State Building Application². A homeowner doing eligible work must keep the project at the primary residence and use licensed contractors for subcontracted work⁷.
3. Apply through the CID online portal or contact the Las Cruces District Office at 575-524-6320^12,14. Give CID the total project cost, then pay the calculated fee so processing can begin².
4. Apply for the septic permit through NMED's Carlsbad field office at 575-885-9023 before installing or modifying an on-site liquid-waste system^5,15. Wait for NMED's approval notice before paying, then request inspection before covering the system⁵.
5. Request the applicable foundation, slab or under-floor, frame, weather-resistive-barrier and final inspections; final electrical, plumbing and mechanical approvals come before the final general-construction inspection¹⁷.
6. Do not occupy the residence until the appropriate inspector issues a certificate of occupancy or approves the final inspection, as applicable¹⁷.

Confirm the parcel's zoning under Eddy County's Land Use ordinance and whether it sits in a mapped floodplain, since Eddy County requires its own floodplain permit before construction or fill in a Special Flood Hazard Area^6,18. Ask NMED's Carlsbad field office whether the parcel can pass a septic site evaluation; countywide, only 27.2% of soils rate free of severe limits for a conventional drain field, and Eddy County sees severe drought in roughly 41.4% of years, so water and soil questions deserve real scrutiny before you buy^8,15. If you are buying more than 35 acres that has been used for agriculture for the preceding 3 years, that sale may be exempt from New Mexico's Subdivision Act review¹⁰. Eddy County's typical home value is about $253,886 and its effective property tax rate is about 0.5%, for a median tax bill near $995 a year, well below many rural counties⁸. The nearest city of 100,000 or more people is about 117 miles from the county's center, and federal land covers 58.6% of the county⁸.