Permit Required
Do you need a permit to replace a furnace in Seattle, WA?
Replacing a furnace or heat pump requires a mechanical permit, which covers heating and HVAC equipment, even for like-for-like replacements so the new equipment can be verified against energy-code minimums.
✓ Verified from official source
Source: Seattle SDCI — Mechanical Permit — Verified 2026-06-26
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 HVAC contractor in Seattle
Licensed HVAC contractors near you can handle the permit and the work — compare pros on our directory.
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