Building permits, zoning and septic rules in Glacier County, Montana

A single-family residence in unincorporated Glacier County under state jurisdiction is exempt from the state building permit, but a local ordinance or resolution may impose a building-permit requirement¹. The broader state exemption covers residential buildings with fewer than 5 dwelling units, except when serving transient guests². Farm and ranch buildings, and private garages or storage buildings used by the owner outside a commercial enterprise, are also state-building-permit-exempt². Covered non-exempt construction, alterations, additions, repairs, relocations and changes of occupancy need a state building permit before work starts². Montana’s amended 2024 International Building Code and International Residential Code took effect September 26, 2026; areas outside certified local programs fall under the State Building Codes Bureau¹¹. A state building-permit exemption does not remove separate trade, septic, health or zoning requirements².

For covered non-exempt projects in unincorporated Glacier County under state jurisdiction, contact the Montana Building and Commercial Measurements Bureau during planning and submit construction plans with a Building Permit/Plan Review Application^2,12. Average plan review takes 3 weeks; applicants must answer review comments in writing and pay fees before issuance². The bureau calculates the building-permit fee, with an additional plan-review fee of 35% of that fee; both must be paid before issuance¹. For projects requiring a state building permit, that permit must precede required plumbing, mechanical or electrical permits and their work². The permit holder must call the building inspector at least 24 hours before a requested inspection; the inspector has 72 hours from notification to perform it³.

Glacier County has county-level zoning, but we could not confirm the ordinance text, district boundaries, dimensional standards or geographic exceptions for unincorporated parcels⁴. Ask the Clerk & Recorder which zoning rules apply to the parcel before planning an RV, tiny home, manufactured home or accessory dwelling⁵. Cut Bank has its own zoning, with municipal zoning and subdivision regulations extending beyond city limits subject to a Cut Bank Creek boundary limitation; septic permitting remains with the Glacier County Sanitarian^5,13. In Cut Bank’s Residential II District, a manufactured home used as a single-family residence is allowed on a permanent foundation, while mobile homes are prohibited¹⁴. Montana requires review of qualifying land divisions, including certain divisions creating parcels under 160 acres¹⁵. An agricultural-division exemption requires a covenant restricting agricultural use; changing that use can trigger review¹⁶.

A drainfield permit from the local health department is required in Glacier County even when a property already has a state Certificate of Subdivision Approval⁶. Montana DEQ reviews sanitation for subdivisions creating parcels of less than 20 acres, plus condominiums, recreational camping vehicle parks, and mobile home parks; Glacier County's Sanitarian handles the local drainfield permit^5,17. A disposal system or sewage outlet that discharges into state waters also needs a Montana DEQ discharge permit; that rule does not establish the permit requirement for every private, non-discharging septic system¹⁸. Only 6.2% of Glacier County's soils are rated free of severe limitations for a conventional septic drain field, so evaluate the site before assuming a standard system will work⁷. A groundwater permit is generally required above 35 gallons per minute or 10 acre-feet a year; smaller uses may qualify for an exception after DNRC authorizes a Notice of Intent⁸.

We could not confirm a countywide rule for long-term RV or tiny-home occupancy on private land in unincorporated Glacier County, so ask the Clerk & Recorder which zoning rules govern the parcel^4,5. Travel trailers are prohibited in the Cut Bank city zoning district governed by section 11-4D-1; that district rule does not establish a countywide RV prohibition¹⁹. A tiny home in Glacier County under state jurisdiction may qualify for the residential building-permit exemption when the building contains fewer than 5 dwelling units and does not serve transient guests, but zoning and septic requirements remain separate^2,4,5.

1. Ask the Clerk & Recorder which zoning district and parcel rules apply before finalizing a site plan^4,5.
2. Evaluate septic soils and apply for a drainfield permit through the Glacier County Sanitarian; a state Certificate of Subdivision Approval does not replace that permit^5,6,7.
3. For a well, determine whether use stays at or below 35 gallons per minute and 10 acre-feet a year, then obtain DNRC authorization before using the permit exception⁸.
4. Confirm building-permit jurisdiction and any local requirement; residential buildings under state jurisdiction with fewer than 5 dwelling units are state-building-permit-exempt unless serving transient guests^1,2.
5. For covered non-exempt state projects, submit plans and the application, answer review comments, pay building and plan-review fees, and arrange required inspections^1,2,3.

Water and septic: only 6.2% of the county's soils are rated free of severe limitations for a conventional septic drain field, so budget for a site evaluation and possibly an engineered system⁷. Access: a new or modified driveway approach connecting to a state highway requires an approach permit or right-of-way agreement before construction, while county-road questions go to the Glacier County Road Department^5,20. Terrain and cover: 52.4% of the county's land sits at 15% slope or less, 22.9% is wooded, and 24.1% is federal land⁷. The nearest city of 100,000 or more is about 209 miles from the county's center, and population density is 4.5 people per square mile⁷. The effective property tax rate is about 0.8%, the median property tax bill is about $1,246 a year, and a typical home insurance premium runs about $1,371 a year⁷. Check FEMA flood maps because development in a designated flood hazard area needs a floodplain permit¹⁰.