Permit Required
Do you need a permit to install a water heater in Seattle, WA?
Replacement and new installs generally require a plumbing and/or mechanical permit and inspection.
General requirement — confirm with Seattle Department of Construction and Inspections (SDCI)
No city-specific rule verified yet. This shows the general IRC R105.1 / M1305 requirement. Confirm with Seattle Department of Construction and Inspections (SDCI).
Permit rules vary by property and change over time. This is an informational guide, not legal advice — always confirm with Seattle Department of Construction and Inspections (SDCI) before starting work.
How to get the permit in Seattle
Building department
Apply online
Phone
(206) 684-8600
Code in force
2021 Seattle Residential Code (Seattle's amended adoption of the 2021 IRC)
Need a permit pulled? Find a licensed plumber in Seattle
Licensed plumbers near you can handle the permit and the work — compare pros on our directory.
Find a plumber in Seattle, WA →See Installing a Water Heater permit rules for other cities →