Wisconsin building departments

How permitting works in Wisconsin

Statewide dwelling and commercial codes. Wisconsin's Uniform Dwelling Code covers every new one- and two-family home in the state. Municipalities with delegated authority issue permits; elsewhere applications go to the state.

A county name is only a geographic starting point. Depending on the address, a city, town, borough, township, or county office may issue your permit. How to check who issues your permit.

Wisconsin building codes and licensing

Residential code

Wisconsin Uniform Dwelling Code (SPS 320-325) for one- and two-family dwellings statewide; energy provisions based on the 2009 IECC since January 1, 2016

Commercial code

Wisconsin Commercial Building Code (SPS 361-366), based on the 2021 IBC, IECC, IMC, IFGC, and IEBC with state amendments

Adopted by

Wisconsin Department of Safety and Professional Services (DSPS) (opens in a new tab)

Outside city limits

A UDC permit is required for every new one- or two-family dwelling. If the town or other municipality lacks delegated authority, the application goes to DSPS through eSLA.

Contractor licensing

To pull a building permit for a one- or two-family home, a contractor must hold a DSPS Dwelling Contractor certification. Owners who live or will live in the home are exempt. Dwelling contractors must carry a surety bond or at least $250,000 per occurrence in liability insurance. Wisconsin DSPS – Dwelling Contractor and Dwelling Contractor Qualifier credentials (opens in a new tab)

What is different in Wisconsin

• New homes require footing, foundation, rough-in (framing, electrical, plumbing, HVAC), insulation, and final inspections under the UDC.
• Commercial plans must get DSPS or delegated-municipality plan approval for buildings of 25,000 cubic feet or more, any school, high-hazard occupancy, or building with three or more dwelling units; DSPS does not issue commercial building permits itself.
• Wisconsin amends the 2021 IFGC so that fuel-fired equipment plastic venting must meet UL 1738 (SPS 365.0501(4)).

Wisconsin department guides

Browse Wisconsin counties

Bold counties have at least one researched department guide.

Planning a project in Wisconsin?

Start with what the model codes say, then confirm local rules with the department that serves your address.

• Do I Need a Permit for a Deck
• Do I Need a Permit for a Fence
• Do I Need a Permit for a Shed
• Do I Need a Permit to Replace a Roof
• Do I Need a Permit to Replace a Water Heater
• Do I Need a Permit for a Kitchen Remodel
• How Much Does a Building Permit Cost
• Building Inspection Stages Explained

Sources

1. Wisconsin Department of Safety and Professional Services
2. Wisconsin DSPS – Uniform Dwelling Code program
3. Wisconsin DSPS – Dwelling Contractor Qualifier
4. Wisconsin DSPS – Dwelling Contractor

State facts checked October 21, 2026. Local amendments can change these rules; the department serving your address has the final word.