STATE LICENSE
RequiredWisconsin Department of Safety and Profes…
Chapter 145 of the Wisconsin Statutes makes plumbing a licensed occupation, not just a licensed business: § 145.06(1)(a) bars anyone from engaging in or working at plumbing unless licensed, and § 145.06(2) requires a licensed master plumber in charge of every installation at all times. Each partner, officer, or employee who supervises plumbing installations must hold a master license.
Licenses are expensive and long: the master plumber license is $500 for a four-year term expiring March 31, with 24 hours of continuing education per renewal. The single-family homeowner exemption is real but yields to local ordinance.
The state sets the license floor; the county or city permit office controls filing, inspections, and local rules wherever the job site sits.
Licensing is exclusively state (DSPS); municipalities issue plumbing permits and inspect. The single-family homeowner exemption in § 145.06(4)(a) does not apply where a local ordinance requires licensure.
The local offices section below names the exact permit desk for every Wisconsin county on file.
Each row names the issuing authority, cost, timeline, citation, and status behind the requirement — verified against the official source.
Published fees from the issuing authorities, as of October 2026. Local permit fees vary by project and jurisdiction — the basis is stated where a flat number does not exist.
Chapter 145 licenses people: a master in charge of every job, and a master license for each partner, officer, or employee who supervises installations.
Master and journeyman plumber licenses expire March 31 on a four-year term.
The department may assess forfeitures of up to $2,000 per violation of § 145.06 on its own, without a criminal case.
A practical sequence for a new plumbing contractor in Wisconsin. Actual agency processing times are noted in the ledger above.
Each item names the issuing authority, cycle, and citation.
Statutory consequences with their citations — not estimates, not “commonly cited” guesses.
Holding out as or acting as a master plumber without a license, or otherwise violating ch. 145, is criminal; each day is a separate offense.
DSPS may directly assess forfeitures against anyone who violates the licensing section.
A master who represents an apprentice as a journeyman or charges journeyman wages for one commits a separate offense.
Inside city limits, the city office listed here issues the permit; the county office serves unincorporated areas. Every office links to its official page.
Every fact in this file was checked against these official sources on October 2026.
Pending verification: Years of journeyman experience required before the master plumber exam (SPS 305 text not retrieved) · Whether Wisconsin requires a separate plumbing business/contractor credential beyond the individual master license (none confirmed on DSPS pages)
General information, not legal advice. Always confirm requirements, deadlines, and forms with the issuing authority before filing or contracting.
Store licenses, permits, policies, and renewal dates in one place.