HVAC permits in Washington
When a permit is needed to replace a furnace, AC or heat pump in Washington, what it costs by city, and who pulls it.
Yes
Permit for a replacement
state default
—
Typical fee
where we have one
1
Cities with verified
fee schedules
Do you need a permit?
In Washington, replacing a furnace, air conditioner or heat pump normally needs a mechanical permit and an inspection. IRC 2018 listed as adopted for the state in the ICC adoption chart (Jan 2024); statewide enforcement assumed (confirm). IRC R105.1 requires a permit to install or replace mechanical equipment; R105.2 exempts only portable units and minor parts (https://codes.iccsafe.org/content/IRC2021P2/chapter-1-scope-and-administration). State default fee not set: fees are set by local jurisdictions (see city rows).
Why it matters
- An inspection catches unsafe gas, venting and electrical work.
- Unpermitted work can void equipment warranties and complicate a home sale.
- Some rebates require proof of a permit.
Typical fees by city
| City | Typical permit fee |
|---|---|
| Seattle | Varies |
Sources
- Washington (state) — https://www.iccsafe.org/wp-content/uploads/Master-I-Code-Adoption-Chart-Jan-2023.pdf
- Seattle — https://www.seattle.gov/construction-and-inspections
Second opinion
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