Building permits, zoning and land rules in San Juan County, Utah

At a glance

Building permit

Required for new construction and moving a trailer or pre-built home onto a lot¹

Zoning

Yes; parcel-specific county land-use controls apply²

Septic

Permitted and inspected by San Juan Public Health³⁵

RV living

Private-land occupancy was not confirmed; ask Planning & Building⁶

Tiny homes

Permission outside an RV park depends on local land-use treatment⁷

Owner-builder

A limited contractor-license exemption is available, but permits still apply⁸

Private well

A valid water right and state approval are required before construction⁹

Agricultural structures

A conditional state-code exemption may apply to non-occupiable farm structures¹⁰

Who to call

Contact details are copied from each office’s official page and were checked against it on September 27, 2026.

Do you need a building permit in San Juan County, Utah?

Yes. San Juan County requires a building permit for all new construction and before moving a trailer or pre-built home onto a lot.¹ County building, construction and fire codes follow the codes adopted by Utah, including state modifications and later legislative amendments.¹¹

An owner-builder exemption does not erase the permit requirement.⁸ A sole owner may use the licensing exemption only for the owner's noncommercial, nonpublic residential construction, subject to its frequency and worker-licensing conditions.⁸ Utah also exempts some structures used solely for agriculture and not for human occupancy from the State Construction Code, but plumbing, electrical or mechanical work may still need permits and location-based limits apply.¹⁰ Ask Planning & Building to confirm the required approvals for the parcel and project before ordering a structure.⁴

Who issues building permits in San Juan County?

The San Juan County Planning & Building Department is the starting point for building, subdivision and conditional-use permit applications.⁴ The department is at 117 S. Main Street in Monticello and can be reached at 435-587-3829 or [email protected].⁴

San Juan County's published material does not give a complete current sequence for every building-permit application.¹ Contact the department with the parcel number, proposed use, building type, utility plan and access plan so staff can identify the applicable zoning review, construction documents and inspections.⁴ If a project divides unincorporated land, a subdivision plat application generally goes to the same department, and compliant applications receive administrative review under the county ordinance.¹² A buyer should confirm the governing process before treating a conceptual layout or seller representation as approval.¹²

Does San Juan County have zoning?

Yes. San Juan County has a zoning ordinance with zoning districts and land-use controls, so the answer depends on the parcel rather than a countywide promise of unrestricted use.² In Spanish Valley, the reviewed material identifies Spanish Valley Residential and Spanish Valley Highway Commercial districts, along with planned-community districts and an overnight-accommodations overlay.¹³ That Spanish Valley list is not a complete inventory for the whole county.¹³

Confirm the parcel's zone with Planning & Building before relying on an RV, tiny-home, setback or minimum-size assumption.⁴ The county's adopted minimum dwelling size and a specific rule for tiny-home occupancy on private land could not be confirmed, so those questions need a parcel-specific answer from Planning & Building.² Development in designated Spanish Valley floodplain areas faces added limits: constrained floodplain land must be identified and kept free of buildings or impervious surfaces.¹⁴

How do septic permits work in San Juan County?

San Juan Public Health permits and inspects every septic wastewater system in San Juan County and maintains system records for residents.³¹⁵ The reviewed permit fee is $440 plus mileage, and the reviewed recertification fee is $78 plus mileage.⁵¹⁶ Call 435-587-3838 to ask about an application or inspection.¹⁵

Only 19.2% of mapped county soils avoid a “very limited” rating for conventional septic drain fields, so a successful conventional layout should not be assumed from acreage alone.¹⁷ Utah's statewide onsite-wastewater rules are administered locally and allow local health departments to impose stricter requirements.¹⁸ In a county subdivision, a private septic system is allowed only when the nearest subdivision boundary is more than 1,320 feet from an approved sanitary sewer system, and the system must meet state and county health requirements.¹⁹

Can you live in an RV or tiny home in San Juan County?

We could not confirm an adopted San Juan County rule that generally allows temporary RV occupancy on private land, so ask Planning & Building about the parcel, duration, utilities and zoning district before moving in.⁴ Utah's RV-park rule addresses temporary quarters in an RV park, not a blanket right to occupy an RV on private acreage.⁶

A tiny house in a Utah RV park must meet the rule's certification or inspection conditions, while permission outside a park depends on local land-use rules and how the unit is classified.⁷ San Juan County's adopted private-land tiny-home occupancy rule and minimum dwelling area could not be confirmed, so Planning & Building should determine whether a proposal is treated as a dwelling, manufactured home, accessory unit or another use.⁴ Moving a trailer or pre-built home onto a lot requires county building approval.¹

Building a home in San Juan County: what are the steps?

1. Ask Planning & Building to identify the parcel's zone, allowed residential use and required building or land-use approvals.²⁴
2. Confirm legal access; a new or intensified connection to a Utah state highway requires a conditional access permit from UDOT.²⁰
3. Secure a lawful water source; a new well requires a valid water right and an approved Start Card before construction.⁹
4. Have San Juan Public Health evaluate the wastewater plan and obtain septic approval before construction when sewer is unavailable.²¹¹⁵
5. Submit the building-permit application to the San Juan County Planning & Building Department and confirm the inspection schedule.¹⁴
6. Do not begin occupancy merely because an owner-builder licensing exemption applies; county permits and inspections remain in force.⁸

What should you check before buying land in San Juan County?

Start with water, wastewater, access, zoning and flood constraints rather than assuming a large rural tract is buildable.² A well needs a valid water right and state permission, while subdivision lots may be required to connect to approved public water and sewer when those systems are close enough.⁹²²

San Juan County receives about 10.2 inches of precipitation a year, and severe drought has affected 37.3% of measured years, making a verified water source especially important.²³²⁴ Federal land accounts for 64.8% of county acreage, so verify that apparent map access actually crosses land where legal access exists.²⁵ The county averages 1.8 people per square mile, and the nearest city of 100,000 or more is about 201 miles from the county center, which can make contractors, materials and service calls harder to arrange.²⁶²⁷ The effective property-tax rate is about 0.8%, with a median annual bill of $1,603.²⁸²⁹

Watch-outs

• Do not treat an owner-builder license exemption as a building-permit exemption; county approval still applies.⁸
• A private septic system in a subdivision may be barred when the subdivision boundary is within 1,320 feet of an approved sewer system.¹⁹
• Private-land RV living, adopted tiny-home occupancy rules and a county minimum dwelling size remain unconfirmed; ask Planning & Building about the exact parcel and proposal.⁴

Sources

1. San Juan County Building Department Checklists (2026 county census)
2. San Juan County Code - Zoning Ordinance (2026 county census)
3. Environmental Health - San Juan County Public Health, Utah, quoted and re-checked
4. San Juan County Planning & Building Department (sanjuancountyut.gov)
5. Environmental Health - San Juan County Public Health, Utah, quoted and re-checked
6. Utah Administrative Code Rule R392-301, Recreational Vehicle Parks (Utah statewide rule), quoted and re-checked
7. OPRO Accessory Dwellings (ADU's) and other dwelling types (Utah statewide rule), quoted and re-checked
8. Utah Code § 58-55-305, Exemptions from licensure, quoted and re-checked
9. Water Well Drilling - Utah Division of Water Rights, quoted and re-checked
10. Utah Code § 15A-1-204 (Utah statewide rule), quoted and re-checked
11. Building Codes Being Used, quoted and re-checked
12. 2025 Final Land Use, Development and Management Ordinance, quoted and re-checked
13. Advisory Opinion 275, quoted and re-checked
14. San Juan County Spanish Valley Development Ordinances, quoted and re-checked
15. San Juan Public Health (sanjuanpublichealth.org)
16. Environmental Health - San Juan County Public Health, Utah, quoted and re-checked
17. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
18. DAR File No. 39821, Rule R317-4, Onsite Wastewater Systems (Utah statewide rule), quoted and re-checked
19. San Juan County Subdivision Ordinance, quoted and re-checked
20. Conditional Access Permit (Utah statewide rule), quoted and re-checked
21. San Juan County Building Department Checklists (2026 county census)
22. San Juan County Subdivision Ordinance, quoted and re-checked
23. Annual precipitation: Bolthole Index county data
24. Share of years in severe drought: Bolthole Index county data
25. Federal land share: Bolthole Index county data
26. Population density: Bolthole Index county data
27. Distance to the nearest metro area: Bolthole Index county data
28. Effective property tax rate: Bolthole Index county data
29. Median property tax bill: Bolthole Index county data

Written September 27, 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.