Land-use permits in Mercer Island: fees, timeline & requirements (2026)
Everything you need to know about pulling a land-use / zoning permit in 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 Mercer Island's source.
When does land-use or zoning work need a permit in Mercer Island?
Triggered when a project does not conform to the strict letter of the zoning code. Variances require a hardship finding under most city codes. Design review thresholds vary (Seattle: most multifamily + non-residential >4,000 sqft; many cities: design review only in designated districts).
From Mercer Island's own code
“B. The location and boundaries of the various zones of the city are shown and delineated on the city of Mercer Island Zoning Map which is set out in appendix D of this development code and is incorporated herein by reference.”Source ↗verified 2026-05-02
Required submittals
- Narrative of request
- Site plan
- Design / elevation drawings if design review
- SEPA checklist (if required)
- Mailing labels for public notice
Inspection sequence
- Intake completeness
- Staff review
- Public comment period
- Decision (admin or hearing examiner)
Who can do this work in Mercer Island?
Kolmo Construction is a licensed Washington general contractor — KOLMOL*753JS, active through April 10, 2027, bonded and insured — working throughout Mercer Island and King County. Kolmo prepares the drawings and submittals, files the land-use / zoning permit with Mercer Island Community Planning & Development, carries the project through review and inspections, and performs the construction. Call (206) 410-5100 for a Mercer Island land-use / zoning quote.
Notes & caveats
Issuing body is city planning, not building. Land-use approvals precede building permits and have their own SEPA threshold review. Process timelines run weeks to months; public notice + hearing examiner involvement is common.
How to apply yourself
- 1. Confirm your parcel's zoning & overlays. Run an address lookup for your Mercer Island land-use / zoning — we'll pull your specific lot polygon, zoning, setbacks, and any shoreline/ECA/historic overlays.
- 2. Assemble submittals: the 5 documents under Required submittals above.
- 3. Submit through the city portal: Mercer Island Community Planning & Development ↗
- 4. Track review. Respond to reviewer comments promptly.
- 5. Pay issuance fees (Mercer Island's fee schedule sets them) and pick up the permit. Inspection card travels with the job.
Or have Kolmo do it
Kolmo prepares the drawings and submittals, files with Mercer Island Community Planning & Development, handles reviewer comments, and builds the project.
Licensed WA general contractor KOLMOL*753JS · bonded & insured
Land-use permits in Mercer Island — FAQ
When does land-use or zoning work need a permit in Mercer Island?
Triggered when a project does not conform to the strict letter of the zoning code. Variances require a hardship finding under most city codes. Design review thresholds vary (Seattle: most multifamily + non-residential >4,000 sqft; many cities: design review only in designated districts).
How much does a land-use / zoning permit cost in Mercer Island?
Mercer Island's land use fees are minimums for a set number of staff hours, billed at $182 an hour beyond them: a variance is $11,830 (65 hours), a conditional use permit $19,110 plus hearing examiner costs, and a pre-application meeting $1,092 with up to 2 reviewers. An ADU's land use review is $728 (2026 Fee Schedule).