Can a Handyman Do Plumbing Work in Wisconsin?

Wisconsin has strict plumbing licensing requirements under Wis. Stat. § 145.06 and Wisconsin Administrative Code SPS 305. All plumbing work — defined as the installation, alteration, or repair of water supply, drainage, waste, and vent piping systems — must be performed by a licensed Master Plumber or a Journeyman Plumber working under the supervision of a Master Plumber. There is no limited or restricted plumbing license that would allow a handyman to perform plumbing work. The distinction between what a handyman can and cannot do is critical. A handyman can replace a faucet, showerhead, or toilet fill valve — these are considered fixture replacements that do not modify the plumbing system. However, the moment the work involves modifying supply lines, drain lines, vent pipes, or relocating fixtures, it becomes licensed plumbing work. Installing a new toilet in a new location, rerouting drain lines, replacing a water heater (which involves water supply connections and gas/electric connections), or adding a hose bib all require a licensed plumber. The penalties for performing unlicensed plumbing work in Wisconsin are significant. DSPS can issue fines, and the person performing the work can face legal liability if the work causes property damage or health hazards. Improperly installed plumbing can lead to sewer gas leaks, contaminated water supply through cross-connections, and water damage from failed joints. Insurance companies may deny claims related to work performed by an unlicensed person. Homeowners are the one exception — you can perform plumbing work on your own owner-occupied single-family home without a plumber's license, but you must obtain a plumbing permit and pass inspection. This exemption exists because the homeowner bears the risk of their own work. It does not extend to rental properties, duplexes, or commercial buildings, and it does not allow you to hire an unlicensed person to do the work for you.

Check Your Municipality

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