Wisconsin plumber license: requirements, reciprocity & renewal

The master license in Wisconsin

Master Plumber: A specific record of not less than 1,000 hours per year of experience for 3 or more years as a licensed journeyman plumber IN Wisconsin — OR graduation in engineering from a department-approved school or college (§145.07(3)). Then pass the master examination. Wisconsin also has a Master Plumber (Restricted) level: 1,000 hrs/yr for 2+ years as a journeyman (restricted).

Because the standard master route requires journeyman experience specifically as a Wisconsin-licensed journeyman, an out-of-state master cannot simply endorse in — see reciprocity.

Renewal & lapse in Wisconsin

Under the general credential statute, Wis. Stat. §440.08(3), a holder who misses the renewal date may restore the credential by paying the renewal fee plus a $25 late renewal fee; the department may by rule impose additional restoration requirements on holders who fail to renew within 5 years.

Reinstatement: After the renewal date: restore by paying the applicable renewal fee plus the $25 late renewal fee (§440.08(3)(a)), with required CE completed.

Past the line: Failed to renew within 5 years: DSPS may require additional requirements to restore the credential, up to — but not more extensive than — the education/examination requirements for an initial credential (§440.08(3)(b)).

Expired? Run the renewal checker with your month count →

Opening a plumbing company in Wisconsin

The seat: Master Plumber (responsible charge). Plumbing work in Wisconsin must be performed by or under a licensed master plumber: the master is the level that may contract for plumbing work and take responsible charge of installations, and journeymen and apprentices work under that structure (Wis. Stat. ch. 145). A business operates through its licensed master plumber in responsible charge.

Wisconsin's 5-year indenture is the longest standard apprenticeship term in this batch, and it is mandatory — there is no experience-only or out-of-state shortcut around §106.025 for the journeyman license.

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Sources

Rules as published by Wisconsin Department of Safety and Professional Services (DSPS) and the statutes it administers, checked October 22, 2026. Board: https://dsps.wi.gov/

• Wis. Stat. §145.07 — Licenses and registration; examinations (master: 1,000 hrs/yr x 3 yrs as WI journeyman or engineering degree; journeyman: must complete apprenticeship under §106.025; restricted levels) — accessed 2026-10-22
• Wis. Stat. §106.025 — Plumber apprenticeships (indenture required; term 5 years, +1 year extension) — accessed 2026-10-22
• WI Dept. of Workforce Development — Plumbing Apprenticeship (about 5 years; 7,428 on-the-job hours; 572 paid related instruction hours) — accessed 2026-10-22
• Wis. Stat. §440.08(3) — Late renewal (renewal fee + $25 late fee; extra restoration requirements possible after 5 years) — accessed 2026-10-22