Do I Need a Permit to Replace a Water Heater in Wisconsin?

Water heater replacement requires a plumbing permit in most Wisconsin municipalities, even for a straightforward like-for-like swap. The permit fee is typically $40 to $150. The inspection verifies proper installation of the temperature and pressure (T&P) relief valve, correct discharge pipe routing, adequate venting (for gas units), proper gas line connections, and code-compliant water supply connections. For gas water heaters, the inspector checks the exhaust vent for proper sizing, pitch, and connection to ensure carbon monoxide is safely vented outside. Electric water heaters require proper electrical connections and may need a dedicated circuit. If you are switching from a traditional tank to a tankless water heater, or from electric to gas, additional permits may be required for gas line modifications or electrical panel work. Wisconsin homeowners can replace their own water heater in an owner-occupied single-family home without a plumber's license, but you must pull the permit and pass inspection. Key code requirements to be aware of: the T&P relief valve discharge pipe must run to within 6 inches of the floor or to an approved drain; expansion tanks are required on closed plumbing systems; and gas water heaters in garages must be elevated at least 18 inches above the floor to prevent ignition of gasoline vapors.

Check Your Municipality

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