Window replacement permits in City of Mercer Island: fees, timeline & requirements (2026)
Everything you need to know about pulling a window replacement 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 Apply via MyBuildingPermit.com..
Free lookup, no account needed — your lot polygon, zoning, setbacks and overlays, cited to City of Mercer Island's source.
When does a window replacement need a permit in City of Mercer Island?
Exempt: in-kind window replacement for IRC structures where no alteration of structural members is required, safety glazing is provided where required, and window fall protection is provided where required. Permit required for: new openings, larger openings, or any structural alteration.
How City of Mercer Island adopted this rule
The threshold comes from the state code (WAC 51.51), which City of Mercer Island adopts by reference in the provision quoted below.
“The 2021 Edition of the International Building Code (IBC), including the adoption of ICC/ANSI A117.1-2017, Requirements for Accessible and Useable Buildings and Facilities, as adopted and amended by the State Building Code Council in WAC Chapter 51-50, as published by the International Code Council, excluding Chapter 1, Administration, is adopted by reference, together with the following amendments and additions. The Construction Administrative Code, as set forth in chapter 17.14 MICC, shall be used in place of IBC Chapter 1, Administration.”Source ↗verified 2026-04-29
Required submittals
- if new/enlarged opening: header schedule, structural detail, WSEC NFRC sticker for U-factor
Inspection sequence
- rough-opening inspection (if structural)
- final
Contractor specialties needed
general
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 window replacement permit with Apply via MyBuildingPermit.com., carries the project through review and inspections, and performs the construction. Call (206) 410-5100 for a City of Mercer Island window replacement quote.
Notes & caveats
Per multi-jurisdiction tip sheet (Mercer Island column): exterior doors/windows/skylights "that require a new opening or larger opening" require a permit. From MICC 17.14.010 §105.2 (enumerated exceptions): "In-kind window replacement for IRC structures where no alteration of structural members is required, safety glazing is provided where required, window fall protection is provided where required..." Window awnings supported by an exterior wall not projecting more than 54 inches and not requiring additional support are also exempt.
Window replacement permit fee — Washington baseline, not City of Mercer Island's own schedule
Worked example for a $8,000 window replacement project (building permit). Your actual fee scales with project valuation.
| Building permit fee | $153.25 |
| Plan review | $99.61 |
| WA state surcharge | $6.5 |
| Estimated total | $259.36 |
Like-for-like usually no permit fee. Structural changes scale with valuation. We have not read City of Mercer Island's adopted fee schedule, so this is not City of Mercer Island's fee: it walks the standard valuation table most Washington cities adopt by reference, as a rough guide. The real numbers are in City of Mercer Island's fee schedule ↗. Impact/utility fees may apply separately.
How to apply yourself
- 1. Confirm your parcel's zoning & overlays. Run an address lookup for your City of Mercer Island window replacement — we'll pull your specific lot polygon, zoning, setbacks, and any shoreline/ECA/historic overlays.
- 2. Assemble submittals (1).
- 3. Submit through the city portal: Apply via MyBuildingPermit.com. ↗
- 4. Track review. Respond to reviewer comments promptly.
- 5. Pay issuance fees (Like-for-like usually no permit fee. Structural changes scale with valuation.) and pick up the permit. Inspection card travels with the job.
Or have Kolmo do it
We pull window replacement permits in City of Mercer Island every month. We prepare the drawings and submittals, file with Apply via MyBuildingPermit.com., handle reviewer comments, and build the project.
Licensed WA general contractor KOLMOL*753JS · bonded & insured
Window replacement permits in City of Mercer Island — FAQ
When does a window replacement need a permit in City of Mercer Island?
Exempt: in-kind window replacement for IRC structures where no alteration of structural members is required, safety glazing is provided where required, and window fall protection is provided where required. Permit required for: new openings, larger openings, or any structural alteration.
How much does a window replacement permit cost in City of Mercer Island?
For a $8,000 window replacement project, the estimated City of Mercer Island permit fee is about $259.36 — building fee $153.25 + plan review $99.61 + surcharges. Fees scale with project valuation per the city schedule.