The county handles building permits for unincorporated areas, while incorporated cities like Bozeman, Belgrade, and Manhattan maintain their own independent building departments and permit processes. Development within the county is subject to specific zoning districts and may require additional review for floodplains or wildland-urban interface fire safety standards.
How this fits with the state
The state authority here is Montana Department of Labor and Industry. The county file does not replace that — it adds the permit office, local overlays, and the actual filing path.