heat pump installation permit requirements across 10 verified Seattle-area cities
Side-by-side: which of Seattle, Bellevue, Kirkland, Redmond, Sammamish, Issaquah, Renton, Kent, Federal Way, and Mercer Island require a permit for a heat pump installation, what triggers one, what it costs, and how long review takes. Verified against each city's own page; sources cited per row.
10 of 10 cities have authoritative rules on file · 10 typically require a permit · 0 often do not.
King County
| Jurisdiction | Permit? | Threshold | Fee | Review days | Source |
|---|---|---|---|---|---|
City of Bellevue city | Yes | Mechanical permit required for the unit, refrigerant lines, and AHU. Electrical permit required for the dedicated 240V circuit (typical 30–60 A). Structural review if rooftop placement or major pad/platform construction. Outdoor-unit setback to property line constrained by city noise ordinance. | Stacks with HOMES rebate (up to $8k income-qualified, Kolmo is participating contractor), IRA 25C 30%/$2k cap, plus PSE / SCL utility rebates. Eligibility per program. | 1–10 days | Cite verified 2026-05-13 |
City of Federal Way city | Yes | Mechanical permit required for the unit, refrigerant lines, and AHU. Electrical permit required for the dedicated 240V circuit (typical 30–60 A). Structural review if rooftop placement or major pad/platform construction. Outdoor-unit setback to property line constrained by city noise ordinance. | Stacks with HOMES rebate (up to $8k income-qualified, Kolmo is participating contractor), IRA 25C 30%/$2k cap, plus PSE / SCL utility rebates. Eligibility per program. | 1–10 days | Cite verified 2026-05-13 |
City of Issaquah city | Yes | Mechanical permit required for the unit, refrigerant lines, and AHU. Electrical permit required for the dedicated 240V circuit (typical 30–60 A). Structural review if rooftop placement or major pad/platform construction. Outdoor-unit setback to property line constrained by city noise ordinance. | Stacks with HOMES rebate (up to $8k income-qualified, Kolmo is participating contractor), IRA 25C 30%/$2k cap, plus PSE / SCL utility rebates. Eligibility per program. | 1–10 days | Cite verified 2026-05-13 |
City of Kent city | Yes | Mechanical permit required for the unit, refrigerant lines, and AHU. Electrical permit required for the dedicated 240V circuit (typical 30–60 A). Structural review if rooftop placement or major pad/platform construction. Outdoor-unit setback to property line constrained by city noise ordinance. | Stacks with HOMES rebate (up to $8k income-qualified, Kolmo is participating contractor), IRA 25C 30%/$2k cap, plus PSE / SCL utility rebates. Eligibility per program. | 1–10 days | Cite verified 2026-05-13 |
City of Kirkland city | Yes | Mechanical permit required for the unit, refrigerant lines, and AHU. Electrical permit required for the dedicated 240V circuit (typical 30–60 A). Structural review if rooftop placement or major pad/platform construction. Outdoor-unit setback to property line constrained by city noise ordinance. | Stacks with HOMES rebate (up to $8k income-qualified, Kolmo is participating contractor), IRA 25C 30%/$2k cap, plus PSE / SCL utility rebates. Eligibility per program. | 1–10 days | Cite verified 2026-05-13 |
City of Mercer Island city | Yes | Mechanical permit required for the unit, refrigerant lines, and AHU. Electrical permit required for the dedicated 240V circuit (typical 30–60 A). Structural review if rooftop placement or major pad/platform construction. Outdoor-unit setback to property line constrained by city noise ordinance. | Stacks with HOMES rebate (up to $8k income-qualified, Kolmo is participating contractor), IRA 25C 30%/$2k cap, plus PSE / SCL utility rebates. Eligibility per program. | 1–10 days | Cite verified 2026-05-13 |
City of Redmond city | Yes | Mechanical permit required for the unit, refrigerant lines, and AHU. Electrical permit required for the dedicated 240V circuit (typical 30–60 A). Structural review if rooftop placement or major pad/platform construction. Outdoor-unit setback to property line constrained by city noise ordinance. | Stacks with HOMES rebate (up to $8k income-qualified, Kolmo is participating contractor), IRA 25C 30%/$2k cap, plus PSE / SCL utility rebates. Eligibility per program. | 1–10 days | Cite verified 2026-05-13 |
City of Renton city | Yes | Mechanical permit required for the unit, refrigerant lines, and AHU. Electrical permit required for the dedicated 240V circuit (typical 30–60 A). Structural review if rooftop placement or major pad/platform construction. Outdoor-unit setback to property line constrained by city noise ordinance. | Stacks with HOMES rebate (up to $8k income-qualified, Kolmo is participating contractor), IRA 25C 30%/$2k cap, plus PSE / SCL utility rebates. Eligibility per program. | 1–10 days | Cite verified 2026-05-13 |
City of Sammamish city | Yes | Mechanical permit required for the unit, refrigerant lines, and AHU. Electrical permit required for the dedicated 240V circuit (typical 30–60 A). Structural review if rooftop placement or major pad/platform construction. Outdoor-unit setback to property line constrained by city noise ordinance. | Stacks with HOMES rebate (up to $8k income-qualified, Kolmo is participating contractor), IRA 25C 30%/$2k cap, plus PSE / SCL utility rebates. Eligibility per program. | 1–10 days | Cite verified 2026-05-13 |
City of Seattle city | Yes | Mechanical permit required for the unit, refrigerant lines, and AHU. Electrical permit required for the dedicated 240V circuit (typical 30–60 A). Structural review if rooftop placement or major pad/platform construction. Outdoor-unit setback to property line constrained by city noise ordinance. | Stacks with HOMES rebate (up to $8k income-qualified, Kolmo is participating contractor), IRA 25C 30%/$2k cap, plus PSE / SCL utility rebates. Eligibility per program. | 1–10 days | Cite verified 2026-05-13 |
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.