County Building Permits

St Charles County, MO - 2026 Building Permit Guide

Building permit information for unincorporated St Charles County and all incorporated cities. Find your jurisdiction's permit authority, application process, fees, and requirements.

Missouri Updated March 2026

Important: St Charles County issues building permits only for properties in unincorporated areas of the county. If your property is inside an incorporated city, select your city below — that city's building department handles your permits, not the county.

Unincorporated St Charles County

Permit authority
St. Charles County Community Development Department, Building and Code Enforcement Division; Planning and Zoning Division for floodplain and land development items
Phone
636-949-7345
Address
201 N. Second St., Suite 410, St. Charles, MO 63301

Jurisdictions in St Charles County

Select your jurisdiction for local permit authority, portal links, application steps, fees, and inspection requirements.

Unincorporated St Charles County Permit guide → Augusta Permit guide → Cottleville Permit guide → Dardenne Prairie Permit guide → Flint Hill Permit guide → Foristell Permit guide → Josephville Permit guide → Lake Saint Louis Permit guide → New Melle Permit guide → O'Fallon Permit guide → O'Fallon Permit guide → Portage des Sioux Permit guide → St. Charles Permit guide → St. Paul Permit guide → St. Peters Permit guide → Weldon Spring Permit guide → Weldon Spring Heights Permit guide → Wentzville Permit guide → West Alton Permit guide →

Information on this page was last verified: March 2026. Permit rules and fees change — confirm current requirements directly with the relevant city or county department before applying.

Related Missouri Resources

License Requirements Verify your contractor's Missouri license → Contract Template Free homeowner-contractor agreement →

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Important: This page is an educational resource provided by jaspector.com. It is not legal advice, and it does not substitute for official guidance from the permit authorities listed above. Permit requirements, fees, and processes change frequently. Always verify current requirements directly with the issuing department before beginning any construction project. Use of this page does not create an attorney-client relationship. Jaspector assumes no liability for any outcomes arising from reliance on this information.