Which cities is the Kolmo permit lookup verified for?

Ten cities: Seattle, Bellevue, Kirkland, Redmond, Sammamish, Issaquah, Renton, Kent, Federal Way, and Mercer Island. For these, every fee, threshold, and timeline is sourced from the city directly with the exact quote and URL, and re-verified weekly. Outside these ten cities address lookup still works and we render the parcel and Washington-state baseline code, but per-city specifics are flagged as unverified.

Does the lookup cover unincorporated King, Pierce, or Snohomish County?

Address lookup works and parcels resolve to the county building department, but unincorporated coverage is currently baseline-only — Washington-state IRC, IBC, and WSEC plus state critical-area rules. Per-county fee and code deviations have not been verified to the same standard as the ten verified cities.

Will this replace calling the permit center?

For most homeowner projects — decks, kitchens, bathrooms, ADUs, fences, siding, windows, flooring, roofing, HVAC, electrical, plumbing — the published answer matches what the permit center will say, and the homeowner can submit with a pre-filled application packet. For variances, conditional uses, or unusual scope, calling the city planner is still recommended.

Where does the address go after submission?

The address is geocoded via Google Maps to identify the correct county, then queried against public county GIS endpoints. Parcel data is cached for 30 days. The address is not contacted, sold, or shared with third parties.

Who built this — and why?

Built by Kolmo Construction, a licensed Seattle-area general contractor. The team works with permit code daily and built this to fix the public web's poor coverage of homeowner permit questions. The lookup is free; if a homeowner wants a contractor for the project, Kolmo is one option.

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..

Permit required?

Yes — see threshold below

Permit fee

Like-for-like usually no permit fee. Structural changes scale with valuation.

Review timeline

—

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.

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

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.

How to apply

1. Confirm your parcel's zoning & overlays. Run an address lookup on the main permits page — 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 (typical: —). 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.

Compare this against other cities

Side-by-side window replacement requirements across all 10 verified Seattle-area cities.

All City of Mercer Island permits

Every project type — ADU, addition, kitchen, bath, deck, fence, and more — for City of Mercer Island.

City of Mercer Island resourcesPermit portal ↗Fee schedule ↗