County Building Permits

Cowlitz County Building Permit Guide

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

Washington Updated March 2026

Important: Cowlitz 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 Cowlitz County

Permit authority
Department of Building and Planning
Address
311 First Avenue North, Kelso, WA 98626
Hours
Monday-Friday, 8:00 AM to 5:00 PM (Closed 12:00-1:00 PM)
Application method
In-person or by mail (paper-based system)

Cities in Cowlitz County

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

Longview Permit guide → Kelso Permit guide → Castle Rock Permit guide → Woodland 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 Washington Resources

License Requirements Verify your contractor's L&I registration → Contract Template Free homeowner-contractor agreement →

Need help with your project?

Navigating permits in Cowlitz County can be complicated.

Jaspector connects you with local experts who can review your scope, verify your contractor, and help you understand what permits your project actually needs.

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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.