Bolthole Index county-legal census · checked 2026-09-29
20 of Montana's 56 counties — 36% — require no residential building permit and have no county-wide zoning in their unincorporated areas. That is the 7th-largest count of any state. The strongest of them on the Bolthole Index is Mineral County (75/100). Every entry below cites the county’s own official source.
Rules change, and cities inside these counties set their own — treat this as a verified starting point, not legal advice. All 563 counties nationwide → Montana: no building codes → Montana: no zoning → Montana: owner-builder → Montana: no minimum home size → Full Montana profile →
20 of 56 Montana counties · sorted by Index score
Mineral County has no certified local building code program, so it falls under state jurisdiction where single-family residential construction is not subject to building-permit …
Montana DLI - Certified City, County and Town Programs ↗Broadwater County is not a certified local building-code jurisdiction on the Montana DLI list, so unincorporated areas fall under the State Building Codes Bureau, which does not…
Montana DLI Certified City, County and Town Programs ↗Glacier County is not on the Montana DLI list of certified local building-code jurisdictions, so it falls under the state Building Codes Bureau, which does not require permits f…
Montana DLI - Certified City, County and Town Building Code Programs ↗CORRECTED 2026-07-08: Pondera County's certified building program covers COMMERCIAL only (MT DLI certified-government list); under MCA 50-60-102 the state code does not apply to…
MT DLI — Certified governments ↗Montana's state Building Codes Program exempts "residential buildings containing less than five dwelling units" and only requires permits within a certified local government pro…
Montana DLI - Building Permits ↗Montana exempts single-family dwellings from state building permits outside certified local jurisdictions, and Teton County has not adopted a local building-code ordinance (its …
Montana DLI Building Codes Program - Building Permit FAQ ↗Beaverhead County is not on Montana's certified local building-code list, so unincorporated single-family/duplex construction falls to the State Building Codes Bureau, which doe…
Montana DLI Certified City, County and Town Programs ↗Flathead County has no building department and does not regulate building codes; building permits are administered by the Montana Department of Labor & Industry, not the county.
Flathead County - Building Information ↗Musselshell County (and Roundup) is not among Montana's certified local building-code jurisdictions, so it falls under the State Building Codes Bureau, which does not enforce a …
Montana DLI Building Codes Program - Certified Government Programs ↗Montana does not enforce a statewide residential building code in rural counties unless locally adopted; Treasure County maintains only a Growth Policy (advisory under MT law) a…
Treasure County, MT - Planning ↗Toole County has no local building-code enforcement program; under Montana's framework rural counties do not require residential building permits unless a local code is adopted,…
Toole County - Environmental Health and Sanitarian ↗No county building permit program is offered; the Planning Board handles only subdivision plats and certificates of survey, consistent with Montana having no statewide residenti…
Powder River County Planning Board ↗Building and electrical permits administered by Rosebud County. The county page states that permits may still be required by the State of Montana.
County Planner - Rosebud County ↗Montana has no statewide residential building code enforcement in rural counties unless locally adopted, and Carter County's official site lists no building/inspection departmen…
Carter County, MT official website (Departments) ↗"Valley County does not issue countywide building permits." A state building permit is required only for non-exempt buildings, and "residential buildings containing less than fi…
Valley County Planning - Permits (PDF) ↗Montana does not enforce a residential building code in unincorporated rural counties unless locally adopted; Fallon County has no county building-permit department (Planning ha…
Fallon County MT - Planning Department ↗Montana does not enforce a statewide residential building code in rural counties unless locally adopted; Sheridan County's only land-use instrument is a Growth Policy that the c…
Sheridan County, MT - Planning ↗Montana enforces no statewide residential building code in rural unincorporated areas unless locally adopted; McCone County's site lists a Land Planning department but no buildi…
McCone County (official site) ↗Prairie County has no local building department or code-enforcement program; Montana does not require residential building permits in unincorporated rural counties that have not…
Montana Department of Labor & Industry - Building Codes Program ↗County-imposed building permit requirements for buildings erected in Petroleum County. Petroleum County does not impose county building permit requirements beyond requirements i…
Petroleum County Growth Policy 2022 Revision ↗Every county here has a full profile — water, land prices, hazard safety, seclusion, and the rest of its building rules. See the Montana state page for all 56 counties ranked, or go back to the national list.
Off-grid gear
Building on land in one of these Montana counties? The kit we'd start with:
These are affiliate links — we may earn a commission, at no cost to you. As an Amazon Associate, Bolthole Index earns from qualifying purchases.
General guidance, not legal advice. Off-grid, building, and land-use rules are often set at the county level and change often. Verify with your county and state before acting. Data reviewed 2026-06-26.
