Building permits, zoning and land rules in Mountrail County, North Dakota

At a glance

Building permit

Required through Mountrail County Planning & Zoning in unincorporated areas¹

Zoning

County zoning (2022 Land Development Code) applies principally in unincorporated areas; some cities and townships have their own authority²⁵

Septic permit

Required through Upper Missouri District Health Unit before work begins³⁴

RV living

Not confirmed for private land; ask the zoning authority for the parcel⁵

Tiny home

No specific occupancy rule confirmed; zoning and permit review still apply¹⁶

Road approach

County or township approval applies to a new approach, depending on the road⁷

Private well

State appropriation permit required above 12.5 acre-feet per year; lower specified uses must be reported⁸

Agricultural building

State-code exemption may apply if it is not for habitation or public use⁹

Who to call

Contact details are copied from each office’s official page and were checked against it on October 9, 2026.

Do you need a building permit in Mountrail County, North Dakota?

Yes. Unincorporated Mountrail County requires a building permit for residential construction, although the current form does not establish every permit trigger or exemption for every structure type¹⁰. The application must include building plans and a site plan showing setbacks and a floor plan¹¹. Any needed conditional-use or variance approval must come before the building permit, final approval belongs to the Planning and Zoning Board, and the issued permit must be posted near the work site¹¹. The building permit fee for residential, rural-residential, agricultural and recreational buildings is $100 on the form revised October 10, 2025¹². North Dakota's current State Building Code took effect in 2026, but local jurisdictions elect whether to administer and enforce it; we could not confirm that Mountrail County administers the state code for ordinary residential construction, so ask Planning & Zoning which code and inspections apply¹³¹⁴.

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

Mountrail County Planning & Zoning handles the county building-permit application and zoning questions at PO Box 248, Stanley ND 58784-0248; call 701-628-2909 or email melissav@co.mountrail.nd.us¹⁵. The county page provides the building-permit application, the Land Development Code and a map identifying cities and townships with their own zoning authority¹⁵. Septic permits are handled separately by Upper Missouri District Health Unit¹⁶. Start by giving the office your parcel number and proposed use so staff can identify the correct jurisdiction and zoning district. The current county form lists a $100 building permit fee for agricultural, residential, rural-residential or recreational buildings, $350 for commercial buildings, $500 for industrial buildings and $25 for a demolition permit¹². The form says certificates expire one year after issuance¹¹. We could not confirm an owner-builder exemption from county building-permit or inspection requirements, so an owner planning to act as general contractor should ask Planning & Zoning before relying on one.

Does Mountrail County have zoning?

Yes. Mountrail County publishes a Land Development Code adopted in 2022, zoning layers and a map of cities and townships with their own zoning authority²¹⁷. The answer can change with the parcel because cities and some townships administer their own rules¹⁸¹⁵. Setbacks differ by county zoning district, and the county measures them from the edge of the eaves to the property line¹⁹²⁰. Confirm the governing authority and district before judging setbacks, lot area or an allowed use. We could not confirm a county minimum dwelling floor area or minimum lot size, so ask the authority responsible for the parcel. North Dakota exempts a building used for agricultural purposes from the state building-code chapter only when the building is not a place of human habitation and is not for public use; that state exemption does not by itself erase county zoning or permit review⁹.

How do septic permits work in Mountrail County?

Upper Missouri District Health Unit issues septic (onsite wastewater) permits in Mountrail County, while North Dakota licenses installers³⁴. Contact Environmental Health through the Williston office at 701-774-6400 or 1-877-572-3763; the office is at 110 W. Bdwy, Suite 101, Williston, ND 58801¹⁶. A permit is required before constructing, altering, repairing or extending a system, though regular maintenance does not require one²¹. Give the district at least two working days' advance notice and do not cover the installation before inspection unless the district gives prior approval²². The permitting authority must conduct the requested installation inspection within one business day after receiving the request²³. Where water under pressure is not available, human waste must go to an approved privy, chemical toilet or other installation the health unit accepts, and a privy needs health unit approval²⁴. Where public or non-community sewer is available within 200 feet of an occupied premises, the health unit requires connection to that system²⁵. About 64.8% of county soils rate free of severe limitations for a conventional drain field, but an individual parcel still needs site-specific review²⁶.

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

We could not confirm a general rule allowing or prohibiting full-time RV living on private land in Mountrail County. The North Dakota state-park camping limit applies only to state-park campsites and cabins, so it does not answer the private-land question²⁷. Ask the zoning authority for the parcel whether an RV can be occupied during construction or used as a residence, and ask Upper Missouri District Health Unit what approved sanitation arrangement would be required⁵²⁴. We also could not confirm a special tiny-home occupancy rule or minimum dwelling size. A tiny home proposed as a structure in unincorporated county jurisdiction still enters the county building-permit and zoning process¹⁶. A new manufactured home has a separate statewide installation rule requiring a licensed installer and licensed inspector²⁸.

How do you build a home in Mountrail County: what are the steps, in order?

1. Use the county map and Planning & Zoning office to confirm whether Mountrail County, a city or a township governs the parcel¹⁸¹⁵.
2. Confirm the zoning district and resolve any conditional-use or variance request before the building permit can issue¹¹¹⁹.
3. Prepare building plans and a site plan showing the floor plan and property-line setbacks measured from the eaves¹¹²⁹.
4. Apply to Upper Missouri District Health Unit for a septic permit before septic work begins, then schedule inspection before covering the installation⁴²².
5. Ask Road & Bridge about a road approach permit; the published review and inspection fee is $100 per agricultural or residential approach and $200 per commercial or industrial approach⁷.
6. Submit the county building permit application and fee, then wait for Planning and Zoning Board approval¹²¹¹.
7. Post the approved permit near the construction site¹¹.

What should you check before you buy land in Mountrail County?

Verify zoning jurisdiction first because county, city or township rules may govern the parcel³⁰. Check the proposed building envelope against district-specific setbacks, which Mountrail County measures from the eaves to the property line²⁰. Mountrail County regulates subdivisions through Planning & Zoning, but requirements may differ where a city or township has its own development rules³¹. A split creating two or more contiguous lots requires a public hearing and a recorded final plat³². Confirm access before closing because new county-road approaches require County Road and Bridge approval, while township-road approaches require township approval³³. About 88.9% of county land has a slope of 15% or less, while 64.8% of soils rate free of severe conventional-drain-field limits; neither countywide figure replaces a parcel survey or septic evaluation³⁴²⁶. Mountrail County averages 17 inches of precipitation annually and severe drought in 12.3% of years, so resolve a dependable water source before purchase³⁵³⁶.

Watch-outs

• A Mountrail County address does not guarantee county zoning jurisdiction because some cities and townships administer their own zoning approval, though septic permits stay with Upper Missouri District Health Unit⁵³.
• Conditional-use or variance approval must be completed before the county building permit can issue³⁷.
• Do not cover a septic installation before Upper Missouri District Health Unit inspects it unless the unit grants prior approval²².
• Subdivision flood information is not a complete floodplain-development answer; ask Planning & Zoning which floodplain approval applies to the parcel³⁸¹⁵.

Sources

1. Building or Demolition Permit (2026 county census)
2. Planning & Zoning, quoted and re-checked
3. On-Site Wastewater Treatment Systems, quoted and re-checked
4. Planning & Zoning - Mountrail County, quoted and re-checked
5. Planning & Zoning - Mountrail County, quoted and re-checked
6. Planning & Zoning, quoted and re-checked
7. Road & Bridge, quoted and re-checked
8. Water Appropriation Permits (North Dakota statewide rule), quoted and re-checked
9. North Dakota Century Code Chapter 54-21.3, State Building Code (North Dakota statewide rule), quoted and re-checked
10. Building or Demolition Permit, quoted and re-checked
11. Building or Demolition Permit, quoted and re-checked
12. Building or Demolition Permit, quoted and re-checked
13. North Dakota Century Code Chapter 54-21.3, State Building Code (North Dakota statewide rule), quoted and re-checked
14. Building Codes (North Dakota statewide rule), quoted and re-checked
15. Mountrail County Planning & Zoning (co.mountrail.nd.us)
16. Upper Missouri District Health Unit — Environmental Health (umdhu.org)
17. Planning & Zoning - Mountrail County, quoted and re-checked
18. Planning & Zoning, quoted and re-checked
19. Planning & Zoning, quoted and re-checked
20. Building or Demolition Permit, quoted and re-checked
21. ndlegis.gov, quoted and re-checked
22. Individual Sewage Treatment Systems Rules and Regulations, quoted and re-checked
23. North Dakota Administrative Code, Article 33.1-21, quoted and re-checked
24. Individual Sewage Treatment Systems Rules and Regulations, quoted and re-checked
25. Individual Sewage Treatment Systems Rules and Regulations, quoted and re-checked
26. 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
27. Parks and Recreation FAQ (North Dakota statewide rule), quoted and re-checked
28. Manufactured Home Installation Program (North Dakota statewide rule), quoted and re-checked
29. Building or Demolition Permit, quoted and re-checked
30. Planning & Zoning, quoted and re-checked
31. Planning & Zoning - Mountrail County, quoted and re-checked
32. Subdivision Review Application, quoted and re-checked
33. Road & Bridge, quoted and re-checked
34. Share of land at 15% slope or less: Bolthole Index county data
35. Annual precipitation: Bolthole Index county data
36. Share of years in severe drought: Bolthole Index county data
37. Building or Demolition Permit, quoted and re-checked
38. Subdivision Review Application, quoted and re-checked

Written October 9, 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.