§ MO Missouri
County permits
St Charles County
St Charles County issues permits only for unincorporated areas. Inside an incorporated city? Pick the city below — its building department handles your permit.
§ 01 Unincorporated
Unincorporated St Charles County.
If your property isn't inside an incorporated city, the county permit office handles your application directly.
- Permit authority
- St. Charles County Community Development Department, Building and Code Enforcement Division; Planning and Zoning Division for floodplain and land development items
- Website
- https://www2.citizenserve.com ↗
- Online portal
- https://www2.citizenserve.com ↗
- Phone
- 636-949-7345
- Address
- 201 N. Second St., Suite 410, St. Charles, MO 63301
§ 02 Jurisdictions
Cities in St Charles County
Click any city for its full permit guide — authority, fees, application steps, inspections, and exempt work.
§ 03 County navigation
Information last verified for St Charles 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.