How Long Does a Building Permit Last in Wisconsin?

Building permit expiration periods in Wisconsin are set by each municipality, but the most common timeframe is 12 to 18 months from the date of issuance. The key trigger for expiration is inactivity — most municipalities define this as no inspections requested or no work performed within the specified period. A permit that has had continuous work and inspections remains valid even if the project stretches beyond the original timeframe. Milwaukee building permits expire 18 months after issuance or 6 months after the last inspection, whichever is later. Madison permits are valid for 12 months from issuance. Green Bay and most mid-sized Wisconsin cities use a 12-month expiration from the date of the last inspection. These expiration rules apply to all permit types — building, electrical, plumbing, and mechanical. If your permit expires before the project is complete, you will typically need to apply for a new permit and pay the full fee again. To avoid expiration, request inspections at each required stage as you progress through the project. Even if the work is not yet ready for the next formal inspection, contacting your building department to discuss your timeline can sometimes result in a documented extension. Many municipalities allow one 6-month extension upon written request filed before the permit expires, sometimes with a small fee ($25–$100). After the permit expires, some municipalities allow reinstatement within a grace period (typically 30–90 days) for a reinstatement fee rather than requiring a completely new application. If you are planning a project that you know will take longer than 12–18 months, discuss this with your building department at the time of permit application. Some municipalities will issue permits with extended validity periods for large or phased projects, or will note the expected timeline in the permit file to facilitate extensions.

Check Your Municipality

Permit requirements, fees, and exemptions vary by municipality. Verify the specifics for your location.