Building permits, zoning and rural land rules across New Mexico

At a glance

Building permits

33 counties require residential building permits; none are listed as no-permit or limited-permit²⁸⁹

Countywide zoning

9 counties have no countywide zoning; 17 have zoning⁴¹⁰

No building permit and no zoning

0 counties meet both conditions¹¹

Septic permits

State agency in 32 counties; county office in 1⁵

RV living

13 counties have an answer: 8 allowed, 1 temporary-only, 4 limited; 20 unanswered⁶

Tiny homes

9 counties have an answer: 7 allowed, 2 limited; 24 unanswered¹²

Owner-builder

Homeowner permit for a primary residence; permits and inspections still required¹³

Water and wells

Domestic well permit required; basin-specific conditions need checking¹⁴

Who to call

Contact details are copied from each office’s official page and were checked against it on October 10, 2026.

Which New Mexico counties don't require a building permit?

None of New Mexico’s 33 counties are listed as dispensing with residential building permits, and none are listed as requiring them only in limited cases.⁸⁹² A county without its own building counter can still be subject to state construction permitting; qualifying county building departments may administer the applicable codes locally.¹⁵

Covered residential work requires a building permit before work begins, although specified minor work is exempt and separate trade permits may still apply.¹ New Mexico adopts the 2021 International Residential Code with state amendments for covered homes.¹⁶ A homeowner permit can let an owner build a primary residence, but does not remove building permits or inspections.¹³ CID offers online building permit applications, and building permit fees vary with the project.¹⁷¹⁸

Which New Mexico counties have no zoning?

New Mexico has 9 counties without countywide zoning and 17 counties with zoning.⁴¹⁰ The highest-scoring counties in the no-countywide-zoning group are Cibola County, McKinley County, Otero County, San Juan County, Catron County, Grant County, Sierra County, Curry County.⁴ See the New Mexico no-zoning county list for the full group.⁴

No countywide zoning does not cancel the statewide building permit requirement.¹ County subdivision regulations must address matters including water, wastewater, legal access and roads, even where countywide zoning is absent.¹⁹ Municipal zoning jurisdiction can also extend beyond city boundaries under specified arrangements, so ask the county planning office which zoning authority covers the parcel.³

Who issues septic permits in New Mexico?

A state agency handles septic permits in 32 New Mexico counties, with the New Mexico Environment Department the common authority; Bernalillo County is listed with Bernalillo County Public Works as its septic authority.⁵ NMED directs septic permit and existing-permit searches to the local district field office.²⁰

A new or modified on-site liquid waste system requires an NMED septic permit and payment of the permit fee before construction, subject to the qualifying graywater exception.²¹ A dwelling requiring an on-site system also needs that septic approval before construction, modification or transport onto the lot.²¹ Ask the permitting office for the applicable septic fee; the supplied statewide rule requires payment but does not establish a dollar amount.²¹ Off-grid sanitation still needs an approved disposal route: a privy cannot receive other liquid wastes, and the graywater exception has use, storage and setback conditions.²²

Can you live in an RV or tiny home on your land in New Mexico?

New Mexico’s RV answers cover 13 counties: 8 are categorized as allowed, 1 as temporary-only and 4 as limited; 20 counties remain unanswered.⁶ The allowed group is Cibola County, McKinley County, Otero County, San Juan County, Catron County, Grant County, Sierra County, Quay County, subject to the scope and conditions on each county page.⁶ Use the RV-living county list to narrow a search; an unanswered county is not permission to move in.⁶

Tiny-home answers cover 9 counties, with 7 categorized as allowed and 2 as limited; 24 remain unanswered.¹² The tiny-home county list includes answers with different scopes, so confirm the intended residential use with the county planning office.¹² New Mexico recognizes code-compliant permanent-foundation tiny houses with complete living facilities; a unit retaining a permanent axle is treated as an RV.⁷ Tiny-house code recognition therefore does not establish permission for residential RV occupancy on a particular lot.⁷⁶

Where are the best New Mexico counties for a bolthole?

The highest Bolthole Index scores belong to Cibola County, McKinley County, Taos County, Mora County, Rio Arriba County, San Miguel County, Colfax County, Otero County.²³ Cibola County scores 60 and McKinley County scores 57; both require building permits, lack countywide zoning and use state septic permitting.²³ Taos County scores 53 and has both building permits and zoning, with state septic permitting.²³

Across New Mexico counties, the median county farmland value is $796 per acre; that agricultural benchmark is not a price quote for an individual homesite.²⁴ The median county effective property tax rate is 0.6%, and the median county property tax bill is $893 annually.²⁵ Compare the county’s construction and land-use answers alongside those cost benchmarks before choosing a parcel.²³²⁴²⁵

What should you check about New Mexico water and wells?

New Mexico follows prior appropriation for water rights, and domestic wells require a permit.¹⁴ The Office of the State Engineer directs water-rights and well-permit inquiries to the nearest water rights district office.²⁶ Before buying, ask that district office which basin and permit conditions apply to the proposed supply.²⁶

Groundwater management regimes overlap 32 New Mexico counties, so a statewide domestic-well summary cannot replace a basin-specific answer.¹⁴ Cibola County overlaps the Bluewater basin and listed Gallup-basin protection areas classified as over-appropriated or declining.¹⁴ County subdivision regulations also address water availability and conservation, making water part of the land-development approval question.¹⁹ A driveway connecting directly to a state highway needs NMDOT access approval before covered construction or modification; establish the access route alongside the water plan.²⁷

Watch-outs

• Municipal zoning jurisdiction can differ from county boundaries and may extend beyond city limits; ask the county planning office which authority covers the parcel.³
• A no-zoning county still has statewide construction and septic requirements, and covered floodplain development needs approval from the local Floodplain Administrator.¹²¹²⁸
• New Mexico counties may adopt zoning for eligible territory, so confirm the current ordinance with the county planning office before buying.³
• Homeowner permits apply to a primary residence, and homeowner permits cannot authorize HVAC, natural-gas or LP-gas installation work.¹³

Sources

1. New Mexico: Building Permit Guide for Residential Construction, quoted and re-checked
2. Bolthole Index county rulebook, 33 New Mexico counties, as of October 10, 2026: New Mexico counties that require a residential building permit in unincorporated areas
3. New Mexico: nmlegis.gov, quoted and re-checked
4. Bolthole Index county rulebook, 33 New Mexico counties, as of October 10, 2026: New Mexico counties with no county-wide zoning
5. Bolthole Index county rulebook, 33 New Mexico counties, as of October 10, 2026: Who issues septic permits across New Mexico's counties: a state agency, a multi-county health district, or the county
6. Bolthole Index county rulebook, 33 New Mexico counties, as of October 10, 2026: New Mexico counties' answers on living in an RV on your own land
7. New Mexico: 14.7.3 NMAC — 2021 New Mexico Residential Building Code, quoted and re-checked
8. Bolthole Index county rulebook, 33 New Mexico counties, as of October 10, 2026: New Mexico counties that do not require a residential building permit in unincorporated areas
9. Bolthole Index county rulebook, 33 New Mexico counties, as of October 10, 2026: New Mexico counties that require a residential building permit only in some cases (for example floodplain or certain structures)
10. Bolthole Index county rulebook, 33 New Mexico counties, as of October 10, 2026: New Mexico counties with county zoning
11. Bolthole Index county rulebook, 33 New Mexico counties, as of October 10, 2026: New Mexico counties with neither a residential building permit nor county-wide zoning
12. Bolthole Index county rulebook, 33 New Mexico counties, as of October 10, 2026: New Mexico counties' answers on living in a tiny home on your own land
13. New Mexico: 14.5.2 NMAC — Permits, quoted and re-checked
14. New Mexico water rights and groundwater management: National Agricultural Law Center and Bolthole Index groundwater review
15. New Mexico: 14.5.1 NMAC, Construction Industries General Provisions, quoted and re-checked
16. New Mexico: Rules, Laws, and Building Codes, quoted and re-checked
17. New Mexico Regulation and Licensing Department — Construction Industries Division (rld.nm.gov)
18. New Mexico: Construction Industries Forms and Applications Fees, quoted and re-checked
19. New Mexico: Senate Bill 410 — Section 47-6-9 NMSA 1978, Subdivision Regulation—County Authority, quoted and re-checked
20. New Mexico Environment Department — Onsite Wastewater Bureau (env.nm.gov)
21. New Mexico: 20.7.3.401 NMAC — Permitting; General Requirements, quoted and re-checked
22. New Mexico: 20.7.3 NMAC — Liquid Waste Disposal and Treatment, quoted and re-checked
23. Bolthole Index county rulebook, 33 New Mexico counties, as of October 10, 2026: The 8 highest-scoring New Mexico counties on the Bolthole Index (off-grid and homestead land score out of 100), with each one's building-permit, zoning and septic answers
24. Bolthole Index county rulebook, 33 New Mexico counties, as of October 10, 2026: Median farmland value per acre across New Mexico's counties (USDA census, the middle county's value; USD/acre), with the five least expensive counties
25. Bolthole Index county rulebook, 33 New Mexico counties, as of October 10, 2026: Median of New Mexico's county effective property tax rates and median county property tax bills
26. New Mexico Office of the State Engineer (ose.nm.gov)
27. New Mexico: 18.31.6 NMAC, quoted and re-checked
28. New Mexico: Flooding, quoted and re-checked

Written October 10, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.