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, URL, and the date Kolmo sourced it; an automated scanner monitors the source pages daily for drift. 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.

Bathroom remodel permits in City of Mercer Island: fees, timeline & requirements (2026)

Everything you need to know about pulling a bathroom remodel 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

Fees set by jurisdiction. Plus separate electrical, plumbing, and mechanical permits.

Review timeline

—

When does a bathroom remodel need a permit in City of Mercer Island?

Like-for-like fixture replacement in same location with no plumbing rerouting and no new circuits: typically exempt under 2021 IRC R105.2(2)(g). Any relocation, new fixture, new circuit, or shower-pan replacement triggers permits.

Required submittals

floor plan with fixture locations
plumbing diagram
electrical layout
waterproofing detail at tub/shower

Inspection sequence

rough-in (electrical/plumbing/mechanical)
shower-pan/waterproofing
insulation if walls opened
drywall
final

Contractor specialties needed

general, plumbing

Notes & caveats

The Mercer Island Residential Building Permits page lists "Bathroom remodels, kitchen remodels (without removal of load bearing walls)" under the Non-Structural Interior Remodel pathway. Cross-reference: the multi-jurisdiction tip sheet referenced by Mercer Island marks bathroom/kitchen fixture replacement without plumbing-line modification as exempt for sinks and toilets, but flags that tub/shower replacement requires a permit.

Bathroom remodel permit fee estimate in City of Mercer Island

Worked example for a $22,000 bathroom remodel project (building permit). Your actual fee scales with project valuation.

Building permit fee	$349.25
Plan review	$227.01
WA state surcharge	$4.5
Estimated total	$580.76

Fees set by jurisdiction. Plus separate electrical, plumbing, and mechanical permits. Computed from the City of Mercer Island fee bracket schedule · source ↗. Impact/utility fees may apply separately.

How to apply

1. Confirm your parcel's zoning & overlays. Run an address lookup for your City of Mercer Island bathroom remodel — we'll pull your specific lot polygon, zoning, setbacks, and any shoreline/ECA/historic overlays.
2. Assemble submittals (4).
3. Submit through the city portal: Apply via MyBuildingPermit.com. ↗
4. Track review (typical: —). Respond to reviewer comments promptly.
5. Pay issuance fees (Fees set by jurisdiction. Plus separate electrical, plumbing, and mechanical permits.) and pick up the permit. Inspection card travels with the job.

Compare this against other cities

Side-by-side bathroom remodel 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.

Bathroom remodel permits in City of Mercer Island — FAQ

When does a bathroom remodel need a permit in City of Mercer Island?

How much does a bathroom remodel permit cost in City of Mercer Island?

For a $22,000 bathroom remodel project, the estimated City of Mercer Island permit fee is about $580.76 — building fee $349.25 + plan review $227.01 + surcharges. Fees scale with project valuation per the city schedule.

City of Mercer Island resourcesPermit portal ↗Fee schedule ↗