§ MO Missouri
County permits
Franklin County
Franklin County issues permits only for unincorporated areas. Inside an incorporated city? Pick the city below — its building department handles your permit.
§ 01 Unincorporated
Unincorporated Franklin County.
If your property isn't inside an incorporated city, the county permit office handles your application directly.
- Permit authority
- Franklin County Building Department
- Website
- County Permit Page ↗
- Online portal
- County Permit Page ↗
- Phone
- (636) 583-6384
- building@franklinmo.gov
- Address
- 400 E Locust, Room 006, Union, MO 63084
§ 02 Jurisdictions
Cities in Franklin County
Click any city for its full permit guide — authority, fees, application steps, inspections, and exempt work.
§ 03 County navigation
Information last verified for Franklin County, Missouri. Permit rules and fees change frequently — verify current requirements with the issuing department before applying. Jaspector is an educational reference, not legal advice.