Bolthole Index

Grant County, New Mexico

Building permits, zoning and land rules in Grant County, New Mexico

44Index Score / 100
#12 of 33 in New Mexico

Construction in Grant County, New Mexico generally requires a building permit from the state Construction Industries Division, not Grant County.1 Unincorporated Grant County has no county zoning, but the floodplain-development process must be completed before CID will issue a building permit.23 Septic permits come from the New Mexico Environment Department.4

At a glance

Building permit
Required for covered work; issued by New Mexico CID5
Floodplain review
Complete the county process before CID issues a building permit3
Zoning
No county zoning in unincorporated areas2
Septic
State permit required before installation or modification6
Tiny home
No county zoning restriction in unincorporated areas; state building and septic rules still apply7
Owner-builder
Conditional homeowner permit available for a primary residence8
RV living
No county zoning restriction in unincorporated areas; health, fire, septic and floodplain rules may still apply9

Who to call

Building permits

New Mexico Construction Industries Division, Las Cruces

Building permits and inspections, including plumbing, mechanical and electrical trades, for Grant County

575-524-6320

Floodplain permits

Grant County Planning and Mapping Department

Floodplain development permits and county land-development questions

(575) 574-0007

1400 highway 180 East/PO Box 898 Silver City NM 88062

Septic permits

New Mexico Environment Department Silver City Field Office

Liquid-waste permit applications and permit searches for the Silver City area

575-388-1934

SilverCity.ehb@env.nm.gov

3082 32nd Street Bypass, Suite D Silver City, NM 88061

Contact details are copied from each office’s official page and were checked against it on October 7, 2026.

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Do you need a building permit in Grant County, New Mexico?

Yes. Construction and renovation covered by the New Mexico Residential Code generally need a state building permit before work begins.1 Grant County does not issue that permit; the New Mexico Construction Industries Division office in Las Cruces manages applications and inspections, including plumbing, mechanical and electrical trades.10

Grant County adds an important first step: CID will not issue the building permit until the floodplain-development process is complete.3 CID enforces state building, existing-building, energy, mechanical and plumbing codes.11 Limited residential-code exceptions do not erase separate plumbing, electrical or mechanical permit requirements.1 Required residential inspections include foundation, slab or under-floor, framing, weather-resistive barrier and final inspection; final trade inspections precede the final general inspection.12

Who issues Grant County building permits, and how do you reach them?

The New Mexico Construction Industries Division in Las Cruces is the building-permit office for work in Grant County; call 575-524-6320 about building, plumbing, mechanical and electrical permits or inspections.10 Grant County Planning and Mapping handles the county floodplain-development step; call (575) 574-0007 before filing with CID.13

The state building-permit application requires project information, and the valuation-based fee must be paid before issuance.14 State permits can also be completed through CID's online permitting portal.15 After the final general construction inspection is approved, the construction inspector issues the certificate of occupancy.16

Does Grant County, New Mexico have zoning?

Unincorporated Grant County has no county zoning ordinance or regulatory zoning districts.217 The county therefore has no zoning-based minimum dwelling size, minimum lot size, setbacks, lot coverage or building-height limits there.1819202122

No county zoning does not mean no development rules. State building and septic requirements, county floodplain review, subdivision controls, private restrictions and municipal rules can still affect a parcel.23242526 The no-zoning answer does not resolve zoning inside incorporated municipalities.2 Ask Grant County Planning and Mapping to confirm that a parcel is unincorporated and check its floodplain and subdivision status before relying on the absence of zoning.13

How do septic permits work in Grant County?

The New Mexico Environment Department permits on-site liquid-waste systems in Grant County, and the local contact is NMED's Silver City field office at 575-388-1934.427 A permit is required before installing, modifying or operating a covered system, and the application goes to the local NMED field office.64

NMED requires ownership documentation, a site diagram, a floorplan and supporting site information with the application.6 The published fee for a conventional system handling up to 1,000 gallons per day is $225 under the schedule effective July 1, 2020.28 A homeowner-installed system must be inspected before it is covered.29 Only 2.3% of mapped county soils avoid a “very limited” rating for conventional drain fields, so make site evaluation an early feasibility item.30

Can you live in an RV or tiny home in Grant County?

Unincorporated Grant County has no county zoning rule restricting RV occupancy, temporary camping, tiny-home occupancy, manufactured-home occupancy or accessory dwellings.93173233 Those answers are limited to county zoning: municipal rules, private covenants, floodplain review, sanitation requirements and state building or manufactured-housing rules may still control a site.22524

A tiny house used as a dwelling falls under the state residential code when it provides complete independent living facilities, complies with the New Mexico Residential Code and Appendix AQ, and sits on a permanent foundation.34 A tiny house with its permanent axle attached is treated as a recreational vehicle under state rules.34 Obtain NMED approval when an RV or tiny home needs an on-site liquid-waste system.6

Building a home in Grant County: what are the steps?

  1. Confirm that the parcel is unincorporated, then complete the applicable floodplain-development process with Grant County Planning and Mapping before seeking the building permit.2313
  2. Confirm water and wastewater feasibility; obtain the NMED septic permit before installing or operating an on-site system.6
  3. Submit the state building-permit application and required project information to CID, then pay the valuation-based fee before issuance.14
  4. If acting as owner-builder, sign and notarize the homeowner-responsibility form, use licensed subcontractors for separately permitted work, and pass the required CID exam before personally doing electrical, plumbing or mechanical work.35
  5. Schedule the required foundation, under-floor or slab, framing, weather-barrier, trade and final inspections in sequence.12
  6. Obtain a Grant County permit before installing a driveway, culvert or utility facility in a county right-of-way.36

What should you check before buying land in Grant County?

Start with legal access, municipal boundaries, floodplain status, water availability, septic feasibility and any proposed land division.2252426 A driveway, culvert or utility facility within a Grant County right-of-way requires a county permit; the applicant-installed or private-contractor driveway fee is $35.36

Grant County receives about 15.1 inches of precipitation annually, and severe drought occurred in 40.9% of measured years, making a reliable water plan central to rural-land due diligence.3738 We could not confirm the private-well permitting requirement, so ask the New Mexico Office of the State Engineer before treating a proposed well as assured. Conventional septic suitability is also tight: only 2.3% of mapped soils avoid a severe limitation rating.30 The effective property-tax rate is about 0.5%, with a median annual bill of $756.3940

Watch-outs

  • CID will not issue a Grant County building permit until the floodplain-development process is complete.3
  • Only 2.3% of mapped Grant County soils avoid a very-limited rating for conventional septic drain fields.30
  • A driveway, culvert or utility installation in a Grant County right-of-way requires a county permit before work begins.36
  • Grant County's no-zoning answer applies only to unincorporated areas; municipal rules and private restrictions can still affect a parcel.2

Sources

  1. Building Permit Guide for Residential Construction, quoted and re-checked
  2. Grant County Comprehensive Plan, quoted and re-checked
  3. Building Permits | Grant County, NM, quoted and re-checked
  4. Apply for a Permit, quoted and re-checked
  5. Grant County Building Permits (2026 county census)
  6. Apply for a Permit, quoted and re-checked
  7. Grant County Comprehensive Plan, quoted and re-checked
  8. Building Permit Guide for Residential Construction, quoted and re-checked
  9. Grant County Comprehensive Plan, quoted and re-checked
  10. New Mexico Construction Industries Division, Las Cruces (grantcountynm.gov)
  11. Building Permit Guide for Commercial Construction, quoted and re-checked
  12. Building Permit Guide for Residential Construction, quoted and re-checked
  13. Grant County Planning and Mapping Department (grantcountynm.gov)
  14. Building Permit Guide for Commercial Construction, quoted and re-checked
  15. Forms and Applications (New Mexico statewide rule), quoted and re-checked
  16. Building Permit Guide for Residential Construction, quoted and re-checked
  17. Grant County Comprehensive Plan, quoted and re-checked
  18. Grant County Comprehensive Plan, quoted and re-checked
  19. Grant County Comprehensive Plan, quoted and re-checked
  20. Grant County Comprehensive Plan, quoted and re-checked
  21. Grant County Comprehensive Plan, quoted and re-checked
  22. Grant County Comprehensive Plan, quoted and re-checked
  23. Building Permit Guide for Residential Construction, quoted and re-checked
  24. Onsite Wastewater Program, quoted and re-checked
  25. Building Permits, quoted and re-checked
  26. Planning & Community Development, quoted and re-checked
  27. New Mexico Environment Department Silver City Field Office (env.nm.gov)
  28. Apply for a Permit, quoted and re-checked
  29. Homeowners Information, quoted and re-checked
  30. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
  31. Grant County Comprehensive Plan, quoted and re-checked
  32. Grant County Comprehensive Plan, quoted and re-checked
  33. Grant County Comprehensive Plan, quoted and re-checked
  34. 14.7.3 NMAC — 2021 New Mexico Residential Building Code (New Mexico statewide rule), quoted and re-checked
  35. Building Permit Guide for Residential Construction, quoted and re-checked
  36. Utility/Driveway Permit, quoted and re-checked
  37. Annual precipitation: Bolthole Index county data
  38. Share of years in severe drought: Bolthole Index county data
  39. Effective property tax rate: Bolthole Index county data
  40. Median property tax bill: Bolthole Index county data

Written October 7, 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.

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Compared with neighboring counties

Like all 6 of its neighbors, Grant County requires a building permit for a home.

RuleGrant CountyLuna CountyHidalgo CountySierra CountyDoña Ana CountyCatron CountySocorro County
Building permitRequiredRequiredRequiredRequiredRequiredRequiredRequired
County zoningNoYesNot publishedNoYesNoNot published
Septic permitsNMEDNMEDNM Env. Dept.NM Env. Dept.NM Env. Dept.NM Env. Dept.NM Env. Dept.

County locator

Grant County in New Mexico

44
County map
Grant County highlighted among the New Mexico counties · colored by Index score

How Grant County scores

Seclusion82100% ev.
Self-Sufficiency2794% ev.
Admin Boringness4668% ev.
Durability28100% ev.
Property Autonomy38100% ev.
Carry Cost89100% ev.

Evidence strength: 93%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$180kTypical home
0.5%Property tax
$575Land / acre
15.1"Annual rain
40.9% of yrsSevere drought
13.1 / yr (+10.3)Mid-century 100°F days
41.8 daysMid-century dry spell
1.1" (+7.4%)Mid-century 1-day rain
1.22×Wildfire change factor
100%Forward climate coverage
$1,093Home insurance / yr
-0.2% / yrInsurance growth
1.23%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
1,528Radius comparison (15 mi)
6.9People / sq mi
47.6%Federal land
53.5%Land at 15% slope or less
2.3%Soils rated "not limited" for septic (strict USDA rating)
21,576 acWorkable land screen
39.8%Wooded land
12.9 tonsBiomass / forest ac
56.4°FAvg temp

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Cities and towns in Grant County

Inside a city or town, that city usually issues building permits and sets zoning; the county’s rules above cover unincorporated land. Septic, wells and floodplain rules usually stay with the county or state everywhere.

Not yet researched: Village of Santa Clara

Answers from the rulebook for Grant County

What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.

Grant County rules

  • InspectionsRequired

    Residential construction inspections in Grant County under CID jurisdiction.

    • The guide lists foundation, concrete slab or under-floor, frame, weather-resistive barrier, final, and other inspections.
    • Final electrical, plumbing, and mechanical inspections must occur before final general construction inspection.
    “REQUIRED INSPECTIONS To request an inspection e-mail us at CID.lnspection@state.nm.us or call 505-222-9813 or 877-243-0979”
  • Certificate of occupancyRequired

    Use or occupancy of buildings and changes in occupancy classification in Grant County.

    • The construction inspector issues the Certificate of Occupancy after approving the final general construction inspection.
    “No building or structure shall be used or occupied, and no change in the existing occupancy classification of a building or structure or portion thereof shall be made until the building official has issued a certification of occupancy as provided.”
  • County-wide zoningAbsent

    Countywide zoning in Grant County.

    • The Comprehensive Plan states that zoning is not applied in Grant County; subdivision, code-enforcement, floodplain, state building-code, septic, and municipal rules may still apply.
    “The most common form of land use regulation – zoning – is not applied in Grant County.”
  • Local zoningAbsent

    County land-use regulation in unincorporated Grant County.

    • This does not resolve zoning adopted by incorporated municipalities within Grant County.
    “The most common form of land use regulation – zoning – is not applied in Grant County.”
  • Zoning districtsNot published

    County zoning-district maps or schedules in unincorporated Grant County.

    • The Comprehensive Plan states zoning is not applied in Grant County; this does not address municipal zoning districts.
    “The most common form of land use regulation – zoning – is not applied in Grant County.”
  • Minimum dwelling sizeNone

    County zoning dimensional standards for dwellings in unincorporated Grant County.

    • The absence is limited to county zoning; state building-code requirements are not negated.
    “The most common form of land use regulation – zoning – is not applied in Grant County.”
  • Minimum lot sizeNone

    County zoning dimensional standards for lots in unincorporated Grant County.

    • Subdivision, septic, and other non-zoning requirements may impose parcel-size conditions.
    “The most common form of land use regulation – zoning – is not applied in Grant County.”
  • SetbacksNone

    County zoning setback standards in unincorporated Grant County.

    • This does not negate setbacks under septic, floodplain, building, road, or other regulations.
    “The most common form of land use regulation – zoning – is not applied in Grant County.”
  • Lot coverageNone

    County zoning lot-coverage standards in unincorporated Grant County.

    • Other building, drainage, floodplain, or subdivision standards may apply.
    “The most common form of land use regulation – zoning – is not applied in Grant County.”
  • Building heightNone

    County zoning height standards in unincorporated Grant County.

    • State building and other safety rules may still apply.
    “The most common form of land use regulation – zoning – is not applied in Grant County.”
  • Living in an RVUnrestricted

    County zoning restrictions on RV occupancy in unincorporated Grant County.

    • No county zoning rule restricting this use was identified; building, septic, health, fire, floodplain, and municipal rules may still apply.
    “The most common form of land use regulation – zoning – is not applied in Grant County.”
  • Camping on your landUnrestricted

    County zoning restrictions on temporary camping in unincorporated Grant County.

    • No county zoning rule restricting this use was identified; other health, fire, sanitation, and land-use rules may apply.
    “The most common form of land use regulation – zoning – is not applied in Grant County.”
  • Tiny homesUnrestricted

    County zoning restrictions on tiny-home occupancy in unincorporated Grant County.

    • No county zoning rule restricting this use was identified; state building, septic, and occupancy requirements may apply.
    “The most common form of land use regulation – zoning – is not applied in Grant County.”
  • Manufactured homesUnrestricted

    County zoning restrictions on manufactured-home occupancy in unincorporated Grant County.

    • No county zoning rule restricting this use was identified; county ordinances concerning movement or abatement of manufactured homes and state requirements may still apply.
    “The most common form of land use regulation – zoning – is not applied in Grant County.”
  • Accessory dwellingsUnrestricted

    County zoning restrictions on accessory dwellings in unincorporated Grant County.

    • No county zoning rule restricting this use was identified; building, septic, occupancy, and municipal rules may still apply.
    “The most common form of land use regulation – zoning – is not applied in Grant County.”
  • Subdividing landRegulated (with conditions)

    Subdivision and land-division review in Grant County.

    • Grant County Planning and Community Development is responsible for subdivision regulations.
    • Specific exemptions, municipal-boundary limitations, and state-law exceptions may apply; the complete current regulation text was not fully extracted in this run.
    “We are responsible for the Grant County Comprehensive Plans, Land Use and Ordinances, Subdivision Regulations, County Mapping, GIS, Rural Addressing, Code Enforcement and Emergency Management.”
  • Driveway accessRequired

    Installation of driveways, culverts, or utility facilities within Grant County rights-of-way.

    • Application review may take up to five working days.
    • The permit is valid for fifteen working days and construction after expiration violates the ordinance.
    • Traffic-control plans must be approved before work begins where required.
    • A permit/inspection fee of $35 applies to applicant or private-contractor driveway/culvert installation.
    • County installation fees and add-on fees vary by length and installation type.

    permit/inspection fee: 35 USD (Applicant installs or uses a private contractor.) · county installation fee: 75 USD (Up to 40 feet installed by the County.) · add-on fee: 50 USD (Extensions up to 10 feet.) · add-on fee: 75 USD (Extensions over 10 feet up to 40 feet total.)

    “APPLICANT WILL INSTALL/PRIVATE CONTRACTOR The permit/inspection fee is $35.00. Grant County will inform you of the proper size and grade requirements prior to installation. Applicant must notify Grant County when pipe is set for inspection, before it is backfilled (before covering up).”
  • Building in a floodplainRequired

    Building permits in Grant County subject to the floodplain-development permit process.

    • CID will not issue a building permit until the Floodplain Development Permit Application process is completed.
    • The source directs applicants to the appropriate municipality or Grant County Planning Department for more information.
    “CID will not issue building permits until the Floodplain Development Permit Application process has been completed.”
    One more reviewed finding on this topic
    • Required — Building construction in Grant County subject to the county floodplain-development process
      “However, CID will not issue building permits until the Floodplain Development Permit Application process has been completed. Please contact the appropriate municipality or the Grant County Planning Department for more information regarding this process.”

New Mexico rules that apply here

  • Building permitRequired

    Buildings and structures regulated by the New Mexico Residential Code, including residential construction, alterations, repairs, additions, moves, improvements, removals, conversions, and demolitions, and state-administered commercial construction.

    • A permit must be obtained before covered work begins.
    • Residential exceptions include one-story detached accessory buildings used as tool or storage sheds, playhouses, and similar uses not exceeding 120 square feet; fences not over 6 feet high; specified retaining walls; certain water tanks, sidewalks, driveways, finish work, shallow prefabricated pools, playground equipment, window awnings, and detached decks.
    • Unless otherwise exempted, separate plumbing, electrical, and mechanical permits may still be required for otherwise exempted residential work.
    • Commercial applicants must be validly licensed with the appropriate license classification, submit the state building permit application, obtain any required city or county zoning approval, and pay the valuation-based fee before permit issuance.

    residential accessory-building exemption floor area: <= 120 square feet (One-story detached accessory buildings used as tool and storage sheds, playhouses, and similar uses.) · fence exemption height: <= 6 feet · water-tank exemption capacity: <= 5000 gallons (Height-to-diameter or width ratio must not exceed 2:1.) · detached-deck exemption area: <= 200 square feet (Deck must not be more than 30 inches above grade, must not be attached to a dwelling, and must not serve the required exit door.)

    “Except as specified in Section 105.2 IRC, no building or structure regulated by this code shall be erected, constructed, enlarged, altered, repaired, moved, improved, removed, converted, or demolished unless a permit has first been obtained from the building official.”
    2 more reviewed findings on this topic
    • Required — Buildings and structures regulated by the New Mexico Residential Code in Grant County
      “Except as specified in Section 105.2 IRC, no building or structure regulated by this code shall be erected, constructed, enlarged, altered, repaired, moved, improved, removed, converted, or demolished unless a permit has first been obtained from the building official.”
    • Required — Building and residential construction in Grant County governed by the New Mexico Residential Code.
      “Except as specified in Section 105.2 IRC, no building or structure regulated by this code shall be erected, constructed, enlarged, altered, repaired, moved, improved, removed, converted, or demolished unless a permit has first been obtained from the building official.”
  • Owner-builder exemptionConditional

    A New Mexico property owner constructing or altering the owner’s single-family primary residence, including permitted appurtenant structures, under a homeowner’s permit.

    • The exemption is limited to construction or alteration of the owner’s primary residence; other use cancels the current permit and can result in denial of later homeowner permits.
    • The homeowner must comply with CILA, NMAC rules, applicable standards and codes, and may act as the general contractor only when the major portion of the work, based on dollar amount, is completed by the homeowner.
    • A permit is required for all construction-related work for which a permit is required by statute or rule; the rule does not exempt the owner-builder from state permitting or inspections.
    • Homeowner permits are limited to single-family dwellings and appurtenant structures such as private garages, carports and sheds, require proof of ownership, and are subject to AHJ approval.
    • The application requires an AHJ-approved application, signed and notarized responsibility sheet, acknowledgement of the homeowner-permit instructions, local zoning approval, floodplain determination, proof of identity and ownership, and payment of required fees.
    • Separate homeowner permits may be issued for general building construction, mechanical/plumbing and electrical work; each is limited to the primary residence and does not apply to rental property, other owned property, or commercial work or property.
    • The homeowner is responsible for requesting inspections, correcting code violations, and requesting re-inspections for a certificate of occupancy or final inspection. Subcontractors remain responsible for permits, inspections and corrections for plumbing, mechanical and electrical work they perform.
    • The homeowner may perform authorized work personally or with W-2 employees, or subcontract part of the work while self-performing a significant portion. Subcontracted work must be performed by licensed contractors who obtain their own permits and pass required inspections.
    • A homeowner permit is invalid for a project managed, supervised or acted on as general contractor by a GB-2 or GB-98 contractor; that contractor must obtain the appropriate permits and assumes responsibility for the site work.
    • Single-scope projects such as roofing or window installation are ineligible when subcontracted and not performed by the homeowner or valid W-2 employees.
    • Plumbing requires sufficient knowledge as determined by the TBC or CBO; a written examination with a minimum passing score of 75% may be required, failed examinations may not be repeated sooner than 30 days, and permitted plumbing work must be performed by the permittee.
    • Electrical work requires approved plans or drawings and a CID homeowner electrical exam with a minimum passing score of 75%; failed examinations may not be repeated sooner than 30 days, and permitted electrical work must be performed by the permittee.
    • A homeowner permit may not be issued for HVAC, natural gas or LP gas installations. HVAC and natural-gas work requires a properly licensed contractor and AHJ permitting and inspection; LP-gas work requires a properly licensed contractor and permitting and inspection through the LP gas trade bureau.
    • A homeowner-permit project may not be placed on the market for sale while under construction; doing so automatically voids the permit and may lead to unlicensed-contracting charges.
    • No more than one homeowner permit for a single-family dwelling may be issued to the same property owner within any 12-month period.
    • The cited rule section states an adoption/replacement date of March 10, 2022.

    homeowner electrical exam minimum passing score: >= 75 percent (Required after plan approval for issuance of a homeowner electrical permit.) · homeowner plumbing exam minimum passing score: >= 75 percent (The TBC or CBO may require the written examination.) · failed homeowner exam retest interval: >= 30 days (Failed plumbing and electrical examinations may not be repeated sooner.) · homeowner permits per single-family dwelling and property owner: <= 1 per 12 months

    “A homeowner permit allows homeowners to obtain permits for constructing or altering their primary residence without becoming a licensed contractor is strictly limited to construction and alteration of their primary residence. Any other use of a homeowner’s permit shall result in cancellation of the current homeowner permit and denial of any subsequent request for a homeowner permit. The homeowner licensing exemption requires conformity with CILA, its rules, standards and codes. This includes a homeowner acting as a general contractor for the project. The homeowner’s permit authorizes the homeowner to physically perform the work, alone or with legal employees, or act as a general contractor and subcontract portions of the work to licensed contractors. In order to qualify for the homeowner permit the major portion of the work to be performed, based on dollar amount, must be completed by the homeowner. A homeowner’s permit may only be issued to a property owner and only for the property owner’s primary residence occupied or intended to be occupied by the homeowner.”
    2 more reviewed findings on this topic
    • Available (with conditions) — A homeowner requesting a homeowner construction permit for a residential project in Grant County
      “The qualifying party for the licensed contractor requesting the permit or the homeowner requesting a homeowner construction permit must sign the application. The homeowner must also sign and notarize the HOMEOWNER’S RESPONSIBILITIES FORM, FOR BUILDING A HOME OR FOR ALTERATIONS, and REPAIRS OR IMPROVEMENTS TO A HOME WITH A HOMEOWNER'S PERMIT form.”
    • Conditional — Homeowner construction permits for residential construction in Grant County.
      “The homeowner must also sign and notarize the HOMEOWNER’S RESPONSIBILITIES FORM, FOR BUILDING A HOME OR FOR ALTERATIONS, and REPAIRS OR IMPROVEMENTS TO A HOME WITH A HOMEOWNER'S PERMIT form. A homeowner's permit may not be used to permit a project where a GB-2 or GB-98 contractor is acting as a general contractor on the project.”
  • Building code adoptedAdopted (with conditions)

    Commercial construction, alteration, relocation, enlargement, replacement, repair, equipment, use and occupancy, location, removal, and demolition of buildings or structures in New Mexico subject to the jurisdiction of the Construction Industries Division.

    • The 2021 New Mexico Commercial Building Code applies on or after July 14, 2023.
    • The rule does not apply when performed pursuant to a permit for which an application was received by CID before July 14, 2023.
    • Detached one- and two-family dwellings and multiple single-family dwellings (townhouses) not more than three stories high with separate means of egress, and their accessory structures, must comply with the 2021 New Mexico Residential Building Code instead.
    • Existing buildings not subject to the residential code undergoing a change of occupancy, repair, alteration, or addition must comply with either the commercial building code or the existing building code, as applicable.
    • The rule adopts the 2021 International Building Code by reference, as amended by the rule.

    effective date: 2023-07-14 (unless a later date is cited at the end of a section) · adopted reference code: 2021 International Building Code (as amended by 14.7.2 NMAC)

    “14.7.2.5 EFFECTIVE DATE: July, 14, 2023, unless a later date is cited at the end of a section. [...] 14.7.2.8 ADOPTION OF THE 2021 INTERNATIONAL BUILDING CODE: A. This rule adopts by reference the 2021 International Building Code, as amended by this rule.”
    4 more reviewed findings on this topic
    • Adopted (with conditions) — Construction in Grant County subject to New Mexico Construction Industries Division enforcement
      “The Construction Industries Division currently enforces the following codes: 2021 NM [International] Commercial & Residential Building Code; 2021 NM [International] Existing Building Code; 2018 NM [International] Commercial Energy Conservation Code; 2021 NM [Uniform} Mechanical Code (IAPMO); 2021 NM [Uniform] Plumbing Code (IAPMO).”
    • Adopted — Residential construction in Grant County subject to New Mexico Construction Industries Division enforcement.
      “The Construction Industries Division currently enforces the following codes: • 2021 New Mexico Commercial & Residential Building Code • 2021 International Building Code • 2021 International Residential Code”
    • Adopted (with conditions) — Detached one- and two-family dwellings, multiple single-family dwellings (townhouses) not more than three stories high with separate means of egress, and their accessory structures in New Mexico subject to the jurisdiction of the Construction Industries Division.
      “14.7.3.5 EFFECTIVE DATE: July 14, 2023, unless a later date is cited at the end of a section. From the date of publication of this rule in the New Mexico register, until December 14, 2023, permits may be issued under either the previously adopted rule, or this rule. After December 14, 2023, permits may be issued only under this rule. [...] A. This rule adopts by reference the 2021 International Residential Code, as amended by this rule.”
    • Adopted — Residential construction in New Mexico subject to the jurisdiction of the Construction Industries Division, including detached one- and two-family dwellings, qualifying townhouses, and their accessory structures.
      “This rule adopts by reference the 2021 International Residential Code, as amended by this rule.”
  • Who permits septicState

    On-site liquid waste systems and effluent receiving 5,000 gallons or less per day and not requiring a discharge plan or NPDES permit.

    • 20.7.3 NMAC identifies the New Mexico Environmental Improvement Board as the issuing agency and defines the department as the New Mexico Environment Department.
    • More stringent city or county requirements may also apply.

    maximum regulated flow: <= 5000 gallons per day (Systems requiring a discharge plan under 20.6.2 NMAC or an NPDES permit are outside this part.)

    “20.7.3.1 ISSUING AGENCY: New Mexico Environmental Improvement Board.”
    2 more reviewed findings on this topic
    • State (with conditions) — On-site liquid-waste systems in Grant County
      “Submit to Local NMED Field Office for review. NMED will notify applicant of actions taken on the permit application. Actions may included granting the permit, granting with conditions, or denial.”
    • State — Onsite wastewater and septic systems in Grant County.
      “The Onsite Wastewater Bureau ensures septic systems are adequately installed and maintained in a manner that is protective of public health and the environment.”
  • Septic permitRequired

    Installation or modification of a new or existing on-site liquid waste system, including residential or commercial units on lots for which such a system is required.

    • A permit issued by the New Mexico Environment Department, including payment of the permit fee, is required before construction or modification.
    • A permit is not required for graywater discharges or systems meeting 20.7.3.810 NMAC.
    • A dwelling may not be constructed, modified, or transported onto a lot requiring an on-site liquid waste system unless the department has issued the permit beforehand.
    • Other state, city, county, or federal approvals may also be required.
    • The department generally acts within 10 working days after a completed conventional-system application, subject to the rule's extension for potentially more stringent requirements.

    maximum regulated flow: <= 5000 gallons per day (20.7.3.2 NMAC scope limitation) · permit application completeness determination: 5 working days (Conventional systems) · conventional permit decision: 10 working days (After receipt of a completed application; review may extend to 20 working days when more stringent requirements may be necessary)

    “No person shall install or have installed a new on-site liquid waste system or modify or have modified an existing on-site liquid waste system, unless that person obtains a permit issued by the department, including payment of the permit fee, prior to construction of such installation or modification.”
    2 more reviewed findings on this topic
    • Required — Installation, modification, or operation of individual liquid-waste systems in Grant County
      “Application – Print and fill out an Application for Liquid Waste Permit, Section 20.7.3.401 NMAC”
    • Required — Installation, modification, or operation of onsite liquid-waste systems in Grant County.
      “Application – Print and fill out an Application for Liquid Waste Permit, Section 20.7.3.401 NMAC”
  • Septic inspectionLimited

    Property transfers involving property with an established on-site liquid waste system, subject to the applicable local exception for unincorporated Bernalillo County.

    • Before transfer, the transferor must have the established on-site liquid waste system evaluated.
    • The evaluation must be performed by an evaluator qualified under 20.7.3.904(B) using a department-approved form.
    • Unpermitted systems must be registered under 20.7.3.401(J) or permitted under 20.7.3.401(K).
    • Evaluators must submit copies of evaluation reports, whether completed or not, to the department within 15 days.
    • A permit or variance application must be submitted within 15 days of the evaluation to correct deficiencies or permit violations identified by the evaluation.
    • Advanced treatment systems and holding tanks have additional ownership-transfer, maintenance-contract, sampling, and permit-amendment requirements.
    • An inspection or evaluation performed within the prior 180 days may support an extension request if the permitted system has not been used since that inspection or evaluation.

    evaluation-report submission deadline: 15 days (Evaluators must submit copies of all reports, whether completed or not) · permit or variance application deadline after evaluation: 15 days (Applies when correcting deficiencies or permit violations identified by the evaluation) · possible evaluation extension lookback: 180 days (The system must not have been in use since the inspection or evaluation)

    “Prior to the transfer of a property with an established on-site liquid waste system, the transferor of the property shall have the system evaluated. Liquid waste systems shall be evaluated by an evaluator qualified in accordance with Subsection B of 20.7.3.904 NMAC utilizing a department approved form.”
    2 more reviewed findings on this topic
    • Required — Permitted on-site liquid-waste systems in Grant County
      “Request Inspection by NMED 48 hours (2 business days) in advance (DO NOT COVER BEFORE INSPECTION)”
    • Required — Homeowner-installed onsite liquid-waste systems in Grant County.
      “All Homeowner installations require an NMED final inspection.”
  • Off-grid sanitationLimited

    Privies, permitted on-site liquid waste systems, and qualifying private residential graywater discharges statewide.

    • A privy may dispose of human excreta and toilet paper but not other liquid wastes.
    • Untreated liquid waste must go to a permitted and approved enclosed system, permitted and approved treatment unit, or public sewer, except qualifying graywater.
    • Graywater under 250 gallons per day may be used for household gardening, composting, or landscaping irrigation only if all listed conditions are met, including no runoff, no spraying, no watercourse discharge, floodway exclusion, five-foot groundwater separation, local ordinance compliance, 24-hour storage limit, and specified well setbacks.
    • Graywater use for purposes other than irrigation or composting requires a department permit.

    private residential graywater discharge: < 250 gallons per day (Qualifying graywater discharge under 20.7.3.810 NMAC) · graywater setback from private domestic well: >= 100 feet · graywater setback from public water supply well: >= 200 feet · graywater storage before discharge: <= 24 hours

    “A privy may be used for the disposal of human excreta and toilet paper, but not for the disposal of other liquid wastes.”
  • Mandatory utility hookupConditional

    Residential and commercial units using an on-site liquid waste system when a public sewer is available and connection is required by the local authority with jurisdiction.

    • A public sewer is deemed available when it has capacity and is located in a thoroughfare, right-of-way, or easement abutting the lot.
    • The on-site system must be properly abandoned within 30 days after connection.
    • The state rule does not itself identify which local authority will require connection.

    abandonment deadline after sewer connection: 30 days

    “All residential and commercial units utilizing an on-site liquid waste system shall connect to a public sewer upon availability and if required in accordance with the local authority that has jurisdiction.”
  • Agricultural exemptionConditional

    Statewide agricultural exemption from the New Mexico Subdivision Act for the sale, lease, or other conveyance of a parcel of at least 35 acres.

    • The parcel must be thirty-five acres or larger.
    • The conveyance must occur within a twelve-month period covered by the statutory exception.
    • The land must have been used primarily and continuously for agricultural purposes, in accordance with Section 7-36-20 NMSA 1978, for the preceding three years.

    minimum parcel size: >= 35 acres · agricultural use duration: >= 3 years (land must have been used primarily and continuously for agricultural purposes in accordance with Section 7-36-20 NMSA 1978) · conveyance period: 12 months (within any twelve-month period)

    “the sale, lease or other conveyance of any parcel that is thirty-five acres or larger in size within any twelve-month period; provided that the land has been used primarily and continuously for agricultural purposes, in accordance with Section 7-36-20 NMSA 1978, for the preceding three years;”
    2 more reviewed findings on this topic
    • Conditional — New Mexico contractor licensing requirements for earthmoving, excavating, and ditching activities used in preparation or production of agriculture or maintenance of livestock on a farm or ranch.
      “earthmoving, excavating and ditching activities applicable to the preparation and production of agriculture or maintenance of livestock on a farm or ranch are exempt from licensing requirements.”
    • Conditional — Agricultural land divisions and conveyances that would otherwise fall within the New Mexico Subdivision Act definition.
      “provided that the land has been used primarily and continuously for agricultural purposes, in accordance with Section 7-36-20 NMSA 1978”
  • Permit feesPublished (with conditions)

    New Mexico liquid-waste permitting applicable in Grant County.

    • The NMED page states that liquid-waste permit fees are under 20.7.11 NMAC and labels the schedule effective 07/01/2020.
    • The page lists $225 for a conventional system with design flow up to 1,000 gallons per day, $325 for 1,001 to 2,000 gallons per day, $500 for 2,001 to 5,000 gallons per day, and $450 for an alternative or advanced-treatment system up to 1,000 gallons per day.

    conventional system fee, design flow up to 1000 gpd: 225 USD (effective 07/01/2020) · conventional system fee, design flow 1001-2000 gpd: 325 USD (effective 07/01/2020) · conventional system fee, design flow 2001-5000 gpd: 500 USD (effective 07/01/2020) · alternative or advanced-treatment system fee, up to 1000 gpd: 450 USD (effective 07/01/2020)

    “Conventional system, register, construct, or modify design flow up to 1,000 gpd | 7/1/20 | $225.00”
    2 more reviewed findings on this topic
    • Published (with conditions) — New Mexico liquid-waste permits applicable in Grant County
      “Permit Fees (20.7.11 NMAC) Effective 7/1/20”
    • Variable (with conditions) — New Mexico Construction Industries Division permitting fees for covered construction work statewide.
      “Permitting Fees are based upon type of construction, square footage, type of materials and construction costs.”
  • Permit processPublished (with conditions)

    New Mexico liquid-waste permit applications submitted for Grant County properties.

    • Submit a complete application and supporting documentation to the local NMED Field Office.
    • Conventional systems may take up to five business days for completeness review and ten business days for a decision.
    • Advanced treatment systems may take up to ten business days for completeness review and twenty business days for a decision.
    • Variance processing takes a minimum of twenty days.
    • Payment must not be submitted before notice of approval.
    • Inspection must be requested 48 hours in advance.

    conventional-system completeness check: <= 5 business days · conventional-system decision: <= 10 business days · advanced-treatment completeness check: <= 10 business days · advanced-treatment decision: <= 20 business days · variance processing: >= 20 days (minimum stated)

    “Conventional Systems may take up to five (5) business days for completeness check and ten business (10) days to return a decision. Advanced Treatment Systems may take up to ten (10) business days for completeness check and twenty business (20) days to return a decision.”
    2 more reviewed findings on this topic
    • Published (with conditions) — State building-permit process applicable to construction in Grant County
      “To obtain a permit, the applicant shall fill out an APPLICATION for STATE BUILDING PERMIT supplied by the Construction Industries Division office.”
    • Published (with conditions) — Construction Industries Division permit applications in New Mexico.
      “Permits can also be completed using our online permitting portal.”
  • county zoning authorityGeneral

    New Mexico counties adopting zoning for all or part of unincorporated territory outside municipal zoning jurisdiction.

    • A county zoning ordinance may apply only to territory not within the zoning jurisdiction of a municipality.
    • Municipalities may have concurrent extraterritorial zoning authority in specified areas, including areas near municipalities meeting statutory population thresholds and additional contiguous territory placed under municipal extraterritorial jurisdiction by county-municipal agreement.
    • Concurrent extraterritorial authority is exercised under an extraterritorial zoning authority or joint powers agreement and may be exercised regardless of whether the county has enacted a comprehensive zoning ordinance.
    • If no county zoning ordinance exists, qualified electors may petition for adoption; the petition must equal at least twenty-five percent of the votes cast for governor at the last preceding general election, and the board of county commissioners must adopt a county zoning ordinance within one year.

    minimum petition threshold: >= 25 percent of votes cast for governor at the last preceding general election · county ordinance adoption deadline after qualifying petition: 1 year

    “a county zoning authority may adopt a zoning ordinance applicable to all or any portion of the territory within the county that is not within the zoning jurisdiction of a municipality;”
    One more reviewed finding on this topic
    • General — New Mexico counties may adopt zoning ordinances for all or any portion of county territory that is not within a municipality's zoning jurisdiction.
      “A.  a county zoning authority may adopt a zoning ordinance applicable to all or any portion of the territory within the county that is not within the zoning jurisdiction of a municipality;”
  • county building authorityGeneral

    New Mexico counties that establish and maintain a building department for permitting and inspections of general construction, mechanical-plumbing, and electrical work, including residential construction in unincorporated areas.

    • CID retains statewide permitting and inspection authority unless a county, municipality, or political subdivision has a current building department providing permitting and inspections.
    • To establish and maintain a building department, the county must establish a full-service building department covering general construction, mechanical-plumbing, and electrical trades; employ a full-time certified building official; and employ sufficient CID-certified inspectors for each trade.
    • The county authority does not include liquefied petroleum work, over which CID has exclusive authority.
    • CID conducts all inspections if the county lacks a certified building official.
    • If the certified building official leaves, plan review, permitting, and inspections transfer to the state unless the county replaces the official within 60 days or a longer period approved by the division, or enters a memorandum of understanding with another county, municipality, or political subdivision.

    replacement period for certified building official: 60 days (A longer period may be approved by the division.)

    “In order to establish and maintain a building department allowing permitting and inspections the county, municipality or political subdivision must establish a full-service building department including general construction, mechanical-plumbing and electrical trades, must employ a full-time certified building official and employ sufficient CID certified inspectors to inspect for each trade.”
    One more reviewed finding on this topic
    • Limited — New Mexico counties that qualify as an authority having jurisdiction may administer permitting, inspection, and enforcement for residential construction in unincorporated areas and enforce applicable New Mexico construction codes.
      ““Authority having jurisdiction” “AHJ” means the state or a municipality, county or other political subdivision that has a full-service building department employing a full-time certified building official and has permitting, inspection and enforcement authority over the general construction, electrical and mechanical-plumbing trades within its jurisdiction.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission — ask the county directly.

  • Well permit — Private well permitting in Grant County
  • Short-term rentals — Short-term rental use in Grant County

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Water rights & wells in Grant County

Whether a new home can legally get its own water here — the sub-state groundwater regime, from New Mexico’s water agency.

Over-appropriated / declining

The aquifer here is over-appropriated and declining. A domestic well is usually still permit-exempt, but long-term supply is a genuine risk.

Household wellPermit required (issued by right)

Nearly all developed New Mexico lies inside an OSE 'declared' underground water basin, but a household 72-12-1.1 domestic well is a by-right permit the State Engineer issues even in closed/over-appropriated basins (metering can be required). The by-right amount is cut to 0.25 acre-ft/yr in a declared Domestic Well Management Area, and a few basin-specific orders cap it further (Gallup Order 197, Zuni Order 199) or stop issuing new domestic permits entirely (Hot Springs Order 198).

Limit: 1 acre-ft/yr by right (NMSA 72-12-1.1); 0.25 acre-ft/yr in a declared Domestic Well Management Area

NM OSE domestic well rules, 19.27.5 NMAC ↗
  • Mimbres Basin (Deming-Columbus Administrative Area)partial of county

    Declared basin managed by block administration with Critical Management Areas and OSE closed areas where 'no unappropriated water exists'; new non-domestic appropriations are denied inside CMAs. A 72-12-1.1 household domestic well is expressly exempt and still permitted (reduced ~20 ft water column assumed).

    NM OSE Deming-Columbus Administrative Area Guidelines ↗
  • Lordsburg Underground Water Basinpartial of county

    OSE-declared Article-7 groundwater basin; new non-domestic (72-12-3) appropriations require an OSE permit showing unappropriated water. The 72-12-1.1 household domestic well remains by-right — no Domestic Well Management Area is declared in New Mexico. OSE guidelines apply block administration with a 1.5 ft/yr allowable water-level decline over 40 years; guidelines expressly exempt 72-12-1.1 domestic wells.

    NM OSE Lordsburg Basin Guidelines (2019) ↗
  • Gila-San Francisco Underground Water Basinpartial of county

    OSE-declared Article-7 groundwater basin; new non-domestic (72-12-3) appropriations require an OSE permit showing unappropriated water. The 72-12-1.1 household domestic well remains by-right — no Domestic Well Management Area is declared in New Mexico. Gila/San Francisco drainages; appropriation and transfer are tightly constrained by the Gila adjudication and the federal Arizona Water Settlements Act.

    NM OSE Article 7 (Declared Underground Water Basins) ↗
  • Hatchita Underground Water Basinlocalized of county

    OSE-declared Article-7 groundwater basin; new non-domestic (72-12-3) appropriations require an OSE permit showing unappropriated water. The 72-12-1.1 household domestic well remains by-right — no Domestic Well Management Area is declared in New Mexico. Bootheel OSE-declared basin (Order 163, 2005); new non-domestic appropriations need an OSE permit.

    NM OSE Article 7 (Declared Underground Water Basins) ↗

Prior-appropriation state (first in time, first in right). Groundwater rules change and basin boundaries follow the aquifer, not the county line — confirm current well and appropriation rules with the New Mexico state water agency before you buy or drill.Groundwater governance as of Jul 2026, cited to each administering agency.

Living off-grid in Grant County, New Mexico

Is Grant County a good place to live off-grid or homestead?

Grant County scores 44/100 on the Bolthole Index, a marginal county profile. Its strengths: manageable long-term carry cost and sparse surroundings — about 1,528 people within 15 miles. Watch-outs: thin water margin (15.1″/yr rainfall) and elevated mid-century heat, water, rain, or wildfire exposure.

Do you need a building permit in Grant County, New Mexico?

Grant County generally requires a residential building permit, and it has no county-wide zoning. Onsite septic is permitted by New Mexico Environment Department (NMED) Liquid Waste Program. Owner-builders may act as their own contractor to build their home. These answers are quoted from official sources and independently re-checked. Rules change and cities within the county differ — always confirm with the county before you buy or build.

Can you live in an RV or tiny home on your land in Grant County?

Living in an RV on your own land in Grant County is allowed: County zoning restrictions on RV occupancy in unincorporated Grant County. No county zoning rule restricting this use was identified; building, septic, health, fire, floodplain, and municipal rules may still apply. A tiny home is allowed. Confirm with the county before relying on it.

How much does land cost in Grant County, New Mexico?

Land in Grant County runs about $575 per acre, based on the latest county data.

What is the water situation in Grant County?

Grant County gets about 15.1" of rain a year, with severe drought in roughly 40.9% of years. On water rights, Grant County lies in the Mimbres Basin (Deming-Columbus Administrative Area) — Declared basin managed by block administration with Critical Management Areas and OSE closed areas where 'no unappropriated water exists'; new non-domestic appropriations are denied inside CMAs. A 72-12-1.1 household domestic well is expressly exempt and still permitted (reduced ~20 ft water column assumed)..

How remote is Grant County?

A typical private-land location has about 1,528 people within 15 miles and 1,588,152 within 100 miles. These radius catchments are the published fallback where road routing is unavailable.

How Grant compares in New Mexico

Compare side-by-side →See all 33 New Mexico counties ranked →