§ MT Montana
County permits
Petroleum County
Petroleum County issues permits only for unincorporated areas. Inside an incorporated city? Pick the city below — its building department handles your permit.
§ 01 Unincorporated
Unincorporated Petroleum County.
If your property isn't inside an incorporated city, the county permit office handles your application directly.
- Permit authority
- Montana Department of Labor & Industry, Building & Commercial Measurements Bureau
- Website
- Accela Citizen Access ↗
- Online portal
- Accela Citizen Access ↗
- Phone
- (406) 841-2056
- BUILDINGCODES@MT.GOV
- Address
- P.O. Box 200517, Helena, MT 59602
§ 02 Jurisdictions
Cities in Petroleum County
Click any city for its full permit guide — authority, fees, application steps, inspections, and exempt work.
§ 03 County navigation
Information last verified for Petroleum County, Montana. Permit rules and fees change frequently — verify current requirements with the issuing department before applying. Jaspector is an educational reference, not legal advice.