Heat pump permits in City of Mercer Island: fees, timeline & requirements (2026)
Everything you need to know about pulling a heat pump / ductless mini-split permit in City of Mercer Island, Washington — when one is required, what it costs, how long review takes, what documents are required, and which inspections you can expect. Cited to Mercer Island Community Planning & Development.
Free lookup, no account needed — your lot polygon, zoning, setbacks and overlays, cited to City of Mercer Island's source.
City of Mercer Island: we don't yet have an authoritative heat pump / ductless mini-split rule on file for this city. Until we verify, fall back to Washington-state baseline code (IRC/IBC/WSEC) and the county building department. Call Mercer Island Community Planning & Development for project-specific guidance.
Who can do this work in City of Mercer Island?
Kolmo Construction is a licensed Washington general contractor — KOLMOL*753JS, active through April 10, 2027, bonded and insured — working throughout City of Mercer Island and King County. Kolmo prepares the drawings and submittals, files the heat pump / ductless mini-split permit with Mercer Island Community Planning & Development, carries the project through review and inspections, and performs the construction. Call (206) 410-5100 for a City of Mercer Island heat pump / ductless mini-split quote.
Heat pump permit fee estimate in City of Mercer Island
Worked example for a $16,000 heat pump / ductless mini-split project (building permit). Your actual fee scales with project valuation.
| Building permit fee | $444.19 |
| Plan review | $310.93 |
| WA state surcharge | $6.50 |
| Estimated total | $761.62 |
$2,001 - $25,000.99: $118.83 for the first $2,000 plus $23.24 for each additional $1,000. Whole increments only: this row starts one cent short of the first whole $1,000 past $2,000, so each increment counts once the valuation reaches it. Computed from City of Mercer Island's adopted fee schedule · source ↗. Land use, fire and engineering review, intake, impact and utility fees, where they apply, are charged separately.
How to apply yourself
- 1. Confirm your parcel's zoning & overlays. Run an address lookup for your City of Mercer Island heat pump / ductless mini-split — we'll pull your specific lot polygon, zoning, setbacks, and any shoreline/ECA/historic overlays.
- 2. Assemble submittals (site plan, scope-of-work, photos).
- 3. Submit through the city portal: Mercer Island Community Planning & Development ↗
- 4. Track review. Respond to reviewer comments promptly.
- 5. Pay issuance fees (see fee schedule) and pick up the permit. Inspection card travels with the job.
Or have Kolmo do it
We pull heat pump / ductless mini-split permits in City of Mercer Island every month. We prepare the drawings and submittals, file with Mercer Island Community Planning & Development, handle reviewer comments, and build the project.
Licensed WA general contractor KOLMOL*753JS · bonded & insured
Heat pump permits in City of Mercer Island — FAQ
How much does a heat pump / ductless mini-split permit cost in City of Mercer Island?
For a $16,000 heat pump / ductless mini-split project, the estimated City of Mercer Island permit fee is about $761.62 (building fee $444.19 + plan review $310.93 + surcharges) from City of Mercer Island's adopted fee schedule. Land use, fire and engineering review, intake, impact and utility fees, where they apply, are charged separately.