Wisconsin Building Permits — Complete Guide (2026)
Find, Apply & Track Permits in Cities and Counties Across Wisconsin
Wisconsin has a mandatory statewide building code and a well-organized permitting system. Milwaukee and Madison lead in permit volume. Wisconsin's four-season climate and deep frost requirements are key factors in all structural permits.
How building permits work in Wisconsin
Building permit requirements and processing times in Wisconsin vary by city and county. Use the links below to apply, check status, schedule inspections and find permit information for your location.
Learn the step-by-step permit process →Not sure where to apply?
Enter your city or address to find your permit office.
Permit costs by type — Wisconsin
| Permit Type | Fee Range | Processing Time | Notes |
|---|---|---|---|
| Electrical | $85–$225 | 1–4 days | WI licensed electrician required (homeowner exemption available) |
| Plumbing | $80–$210 | 1–4 days | WI licensed plumber required |
| HVAC / Mechanical | $90–$235 | 1–4 days | Furnace replacement very high volume |
| Roofing | $100–$300 | 1–4 days | Snow load and ice dam protection required |
| New Construction | $550–$1,600 | 2–6 weeks | Well-organized state process |
| Room Addition | $300–$850 | 1–4 weeks | Frost depth 42–48 inches |
| Deck / Patio | $125–$375 | 1–3 weeks | Deep frost footings required |
| Pool | $150–$425 | 1–3 weeks | Short season; barrier required |
| ADU | $300–$800 | 1–4 weeks | Madison leading in WI ADU reform |
| Solar | $85–$235 | 1–4 days | Moderate solar market |
Major Wisconsin cities — apply online
Most Wisconsin building permits are issued by cities. Click your city to access the permit portal, apply online, or check permit status.
Permit costs by county — top Wisconsin counties
County building departments handle unincorporated areas. Click a county to access its permit portal directly.
How to get a building permit in Wisconsin
Find your local building department
Wisconsin has 72 counties and hundreds of municipalities. Milwaukee (Building Inspection), Madison (Building Inspection), and Green Bay have online systems.
Wisconsin contractor licensing
DSPS issues licenses for electrical, plumbing, and HVAC contractors. Homeowners can do their own electrical work on their primary one- or two-family residence.
Submit application and plans
Structural work requires architectural plans. Wisconsin energy code compliance documentation required.
Frost depth design
Wisconsin frost depths range from 42 inches in the south to 48 inches in the north. All exterior footings must be below the frost line.
Phase inspections
Wisconsin requires inspections at each phase. Online scheduling in major cities; counties may share inspectors.
ADU permits in Wisconsin — what you need to know
🏠 Wisconsin ADU-friendly status: Partial
Wisconsin passed SB 36 in 2021 prohibiting municipalities from banning ADUs outright, though local regulations still apply. Madison has an active ADU program — one of the most ADU-friendly cities in the Midwest. Milwaukee allows upper-floor apartments and carriage houses.
Find a licensed Wisconsin contractor
Wisconsin requires licensed professionals for most permitted work. Always verify a contractor's license before hiring — it protects you and is required for most permit types.
General Contractors
Find pre-screened general contractors for your Wisconsin home project. Compare quotes on permitted work.
Find a Contractor →Verify WI License
Verify your contractor holds a valid Wisconsin DSPS – Contractor Credentials license before any permitted work begins.
Verify WI License →Electricians & Plumbers
Specialty-licensed electricians and plumbers are required for all permitted electrical and plumbing work in Wisconsin.
Learn More →Ready to get started? Browse verified, licensed contractors serving Wisconsin homeowners and get free quotes on your project.
🔍 Find a Contractor Near YouFrequently asked questions — Wisconsin permits
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