What Permits Do You Need to Replace a Water Heater in Wisconsin?
Guide to water heater replacement permits in Wisconsin, covering plumbing permit requirements, inspection steps, and code requirements for gas and electric water heaters.
Yes, you typically need a permit. To replace a water heater in most Wisconsin municipalities, you need a Water Heater Permit. Here's exactly what's required.
Permits Required
The following permits are typically required to replace a water heater in Wisconsin. Actual requirements vary by municipality.
Water Heater Permit
Required for water heater installation or replacement in Wisconsin. Even replacing an existing unit in the same location typically requires a permit. Wisconsin requires a licensed plumber for water heater installation under SPS 381–387, with proper venting, gas connections, temperature/pressure relief valve discharge, and seismic strapping where applicable.
Inspection required after work is completed.
Where to Apply
Permit requirements, fees, and processing times vary by municipality. Check the specific requirements for your location:
Browse all jurisdictions →Exemptions & Special Cases
In some circumstances, a permit may not be required. Common exemptions include:
- Water Heater Permit: Point-of-use electric water heaters under some municipalities
- Water Heater Permit: Routine maintenance and flushing
Exemptions vary by municipality. Always confirm with your local building department before starting work without a permit.
Frequently Asked Questions
Do I need a permit to replace a water heater in Wisconsin?
Yes. Most Wisconsin municipalities require a plumbing permit for water heater replacement, even for like-for-like replacements. This applies to both gas and electric water heaters, as well as tankless models. Permit fees typically range from $40 to $150. The inspection verifies proper venting (gas units), temperature/pressure relief valve installation, and code-compliant connections.
Can I install my own water heater in Wisconsin?
Homeowners can replace a water heater in their own owner-occupied single-family home in Wisconsin. You must pull the plumbing permit and pass inspection. For gas water heaters, proper venting is critical — incorrect installation can cause carbon monoxide buildup. If you are switching from tank to tankless or from electric to gas, additional permits (electrical or gas line) may be required.
What code requirements apply to water heaters in Wisconsin?
Wisconsin requires a temperature and pressure (T&P) relief valve on all water heaters, with the discharge pipe routed to within 6 inches of the floor or to an approved drain. Gas water heaters must have proper venting and combustion air. Units in garages must be elevated at least 18 inches above the floor (ignition source protection). Expansion tanks are required on closed plumbing systems.
Building in multiple cities?
See permit requirements for any Wisconsin municipality instantly. Compare fees, timelines, and processes side by side across your active jurisdictions.