Heat pump installation permit requirements across 16 Seattle-area cities
Side-by-side: which of Seattle, Bellevue, Kirkland, Redmond, Sammamish, Issaquah, Renton, Kent, Federal Way, Mercer Island, Shoreline, Tacoma, Lakewood, Puyallup, Everett, Lynnwood require a permit for a heat pump installation, and what triggers one — each row quoted from the city's own code or permit page, with the source linked. Fees and review times appear where the city publishes them.
0 of 16 cities have authoritative rules on file · 0 always require a permit · 16 depend on the scope · 0 do not.
King County
| Jurisdiction | Permit? | Threshold | Fee | Review days | Source |
|---|---|---|---|---|---|
city | Depends on scope | Installing or replacing a heat pump needs a mechanical permit and an electrical permit; a portable unit, a minor part replacement or a small self-contained unit (10 lb of refrigerant or less, 1 hp or less) needs no mechanical permit. — | — | — | Portal |
city | Depends on scope | Installing or replacing a heat pump needs a mechanical permit; a portable unit or a minor part replacement does not. — | — | — | Portal |
city | Depends on scope | Installing or replacing a heat pump needs a City mechanical permit and an L&I electrical permit; a portable unit, work on the piping inside the unit, a minor part replacement or a small self-contained unit does not need the mechanical permit, except outdoors in a flood hazard or critical area. — | — | — | Portal |
city | Depends on scope | Installing or replacing a heat pump needs a mechanical permit; a portable unit or a minor part replacement does not. — | — | — | Portal |
city | Depends on scope | Installing or replacing a heat pump needs a mechanical permit and an electrical permit, both from the City of Kirkland; a portable unit, a part replacement or a small self-contained unit (10 lb of refrigerant or less, motor 1 hp or less) does not, except in a flood hazard area, a critical area or its buffer, or a wildland-urban interface (WUI) location. — | — | — | Portal |
city | Depends on scope | Installing or replacing a heat pump needs a mechanical permit and a City electrical permit; a portable unit, a minor part replacement or a self-contained unit with 10 lb of refrigerant or less and a motor of 1 hp or less does not need the mechanical permit, except outside the house's envelope in a flood hazard or critical area. — | — | — | Portal |
city | Depends on scope | Installing or replacing a heat pump needs a mechanical permit and a City electrical permit; a portable unit, work on the piping inside the equipment, a minor part replacement or a self-contained unit with 10 lb of refrigerant or less or a motor of 1 hp or less does not need the mechanical permit. — | — | — | Portal |
city | Depends on scope | Installing or replacing a heat pump needs a mechanical permit and a City of Renton electrical permit. A portable unit needs none; a minor part replacement, or a small self-contained unit (10 lb of refrigerant or less, motor 1 hp or less), needs none except in a flood hazard area or a critical area. — | — | — | Portal |
city | Depends on scope | Installing or replacing a heat pump needs a mechanical permit (and a City electrical permit); a portable unit, a part replacement, or a small self-contained unit (10 lb of refrigerant or less, 1 hp or less) does not need the mechanical permit. — | — | — | Portal |
city | Depends on scope | Installing or replacing heat pump needs an SDCI mechanical permit. Replacing a component part does not, and neither do portable units that together cover 40 percent or less of the home's requirement and total 3 kW (electric) or 10,000 Btu input (fuel) or less. In a special flood hazard area, or on a parcel with an environmentally critical area, replacing a component part still needs floodplain development approval or the Director's approval of an exemption. — | — | — | Portal |
city | Depends on scope | Installing or replacing a heat pump needs a mechanical permit; a portable unit or a minor part replacement does not. — | — | — | Portal |
Pierce County
| Jurisdiction | Permit? | Threshold | Fee | Review days | Source |
|---|---|---|---|---|---|
city | Depends on scope | Installing or replacing a heat pump needs a mechanical permit; a portable unit or a minor part replacement does not. — | — | — | Portal |
city | Depends on scope | Installing or replacing a heat pump needs a mechanical permit; a portable unit or a minor part replacement does not. — | — | — | Portal |
city | Depends on scope | Installing or replacing a heat pump needs a mechanical permit; a portable unit or a minor part replacement does not. — | — | — | Portal |
Snohomish County
| Jurisdiction | Permit? | Threshold | Fee | Review days | Source |
|---|---|---|---|---|---|
city | Depends on scope | Installing or replacing a heat pump needs a mechanical permit; a portable unit or a minor part replacement does not. — | — | — | Portal |
city | Depends on scope | Installing or replacing a heat pump needs a mechanical permit; a portable unit or a minor part replacement does not. — | — | — | Portal |
How this table is built
Each row reflects the most-recently-verified authoritative rule on file for that jurisdiction and project type. “Pending verification” means we have the jurisdiction in our database but haven't yet personally checked the city page for heat pump installation rules — those rows fall back to county or WA-state baselines until verified. Sources link directly to the city or county page we read on the verified-on date. See our data-quality leaderboard for how we keep these current.