Building permits, zoning and septic rules in Farmington, New Mexico

At a glance

Building permits

Required for most residential projects; start with city Building Inspection¹²

Zoning

City zoning districts govern uses; check the interactive zoning and dimensional standards maps³⁴

Septic permits

NMED permit required before installing or modifying an onsite liquid waste system⁵

Inspections

Required for permitted residential projects, including final inspections⁷

Owner-builder

Homeowners may obtain city building permits; state homeowner licensing exemption is conditional⁸⁹

Floodplain

Floodplain-development permit required before work in a Special Flood Hazard Area¹⁰

Who to call

Contact details are copied from each office’s official page and were checked against it on October 11, 2026.

Do you need a building permit in Farmington, NM?

Most residential building projects inside Farmington require a building permit, and building codes regulate almost every residential project a property owner undertakes.¹ Farmington has adopted international and New Mexico construction codes for city-regulated construction.¹¹ A homeowner or a contractor representing the owner may obtain the city building permit.⁸ Permitted Farmington residential projects require inspections, and the city makes final inspections for all permits.⁷

Before ordering materials, describe the proposed work to Farmington Building Inspection and ask which building and trade applications the project needs.² Ask for the current city fee schedule rather than budgeting from a state-administered permit estimate.

Who handles building permits and zoning questions in Farmington?

For a residential project inside Farmington, start with the City Building Inspection Division, which serves residential and commercial development and checks construction against adopted codes and ordinances.² The city Planning Division is the contact for planning and zoning questions.¹² Send each office the parcel location and proposed use, and ask Planning to identify the district before settling on a house layout.

Farmington homeowners may obtain building permits, but New Mexico’s homeowner licensing exemption is limited to the owner’s primary residence and remains subject to approval by the authority having jurisdiction.⁸⁹ The state exemption still requires applicable building permits, code compliance and inspections; ask Building Inspection how the homeowner application applies to your project.⁹²

Does Farmington have zoning, and can you live in an RV or tiny home?

Farmington has Functional Zoning: land is divided into districts with separate uses and regulations.³ Farmington directs buyers to its Interactive Zoning Map and Setback and Dimensional Standards Map for property-specific classifications and development criteria.⁴ Use those maps with the Planning Division before choosing a building footprint or assuming a particular lot can accommodate another dwelling.⁴¹²

We could not confirm Farmington’s private-land RV living, temporary camping, tiny-home occupancy or accessory-dwelling rules; ask the city Planning Division about the proposed use on the specific parcel.¹² Ask separately about a manufactured home, minimum dwelling size, lot size and setbacks, rather than treating approval of a residential use as approval of every housing type.³

How do septic permits work inside Farmington?

New Mexico requires an NMED permit before installing or modifying an onsite liquid waste system, with a limited exception for qualifying graywater systems.⁵ On a Farmington lot requiring an onsite system, the state rule also requires the liquid waste permit before a dwelling is constructed, modified or transported onto the lot.⁵ NMED’s Farmington Field Office handles liquid waste permitting questions and permit searches.¹³

State rules require an existing onsite-system user to connect to available public sewer when the local authority requires connection; ask the city about sewer service and connection requirements before planning septic.⁶ San Juan County’s soils rating shows 22.5% of soils rated not limited for conventional septic drain fields; that countywide figure calls for a parcel evaluation and does not establish that septic is impossible on other soils.¹⁴

Building a home in Farmington: what steps should you take first?

1. Identify the Farmington parcel’s zoning district and dimensional standards using the city maps, then discuss the proposed use with Planning.⁴¹²
2. Establish wastewater arrangements: if the lot requires onsite liquid waste disposal, obtain the NMED permit before dwelling construction.⁵
3. Ask the city Floodplain Administrator whether the project lies in a Special Flood Hazard Area; Farmington requires a floodplain-development permit before work starts there.¹⁰¹⁵
4. Arrange the city building permit through the homeowner or the contractor representing the owner, and confirm project requirements with Building Inspection.⁸²
5. Complete the required city inspections, including the final inspection.⁷ For a building in a Special Flood Hazard Area, Farmington requires an elevation certificate before the building permit and a final elevation certificate before the certificate of occupancy.¹⁶

What should you check before buying land in Farmington?

Keep the jurisdiction clear: Farmington has city zoning, while the county’s reviewed no-zoning answer concerns rural unincorporated land.³¹⁷ For property outside city limits, use the San Juan County guide and confirm the parcel’s jurisdiction before choosing the building office.¹⁸

Inside Farmington, development in a Special Flood Hazard Area needs city floodplain approval before work; other local, state and federal approvals may also apply.¹⁰ A driveway connecting directly to a New Mexico state highway needs an NMDOT access permit before covered access construction or modification.¹⁹ We could not confirm the requirements for a private well or a new driveway onto a city street; ask Planning to identify the appropriate water or street-access office for the parcel.¹²

Watch-outs

• Farmington’s zoning districts govern city land; rural San Juan County’s no-zoning answer does not authorize an RV or tiny home inside Farmington.³¹⁷
• Farmington buildings in a Special Flood Hazard Area require a final elevation certificate before a certificate of occupancy, with additional FEMA approval required when a structure is on fill.¹⁶
• A homeowner building permit does not remove New Mexico’s primary-residence conditions or inspection requirements for the homeowner licensing exemption.⁹

Sources

1. Residential Building Requirements (Farmington), quoted and re-checked
2. City of Farmington Building Inspection Division (farmingtonnm.gov)
3. City of Farmington Zoning (Farmington), quoted and re-checked
4. City of Farmington Zoning (Farmington), quoted and re-checked
5. 20.7.3.401 NMAC — Permitting; General Requirements (New Mexico statewide rule), quoted and re-checked
6. 20.7.3 NMAC — Liquid Waste Disposal and Treatment (New Mexico statewide rule), quoted and re-checked
7. Residential Building Requirements (Farmington), quoted and re-checked
8. Residential Building Requirements (Farmington), quoted and re-checked
9. 14.5.2 NMAC — Permits (New Mexico statewide rule), quoted and re-checked
10. Floodplain Development Permit Application (Farmington), quoted and re-checked
11. State of NM Adopted Construction Codes (Farmington), quoted and re-checked
12. City of Farmington Planning Division (farmingtonnm.gov)
13. New Mexico Environment Department, Farmington Field Office (env.nm.gov)
14. 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
15. City of Farmington Floodplain Administrator (farmingtonnm.gov)
16. Floodplain Development Permit Application (Farmington), quoted and re-checked
17. sjcounty.net, quoted and re-checked
18. Building Division New Residential Permit Application Checklist, quoted and re-checked
19. 18.31.6 NMAC (New Mexico statewide rule), quoted and re-checked

Written October 11, 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.