Signs permits in Mercer Island: fees, timeline & requirements (2026)
Everything you need to know about pulling a sign 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 a sign need a permit in Mercer Island?
Each city's own sign code, usually a chapter of its zoning or development code, decides which signs need a permit and sets their size, number and placement by zone. Putting up or structurally altering a permanent sign generally needs a city sign permit, plus an electrical permit if the sign is lit, while repainting, ordinary maintenance and copy changes generally do not. Which small or temporary signs need no permit, and up to what size, differs from city to city, so check the city's own list before ordering a sign.
From Mercer Island's own code
“d. Maximum height. The maximum height of any sign within ten feet from any property line facing a street shall be 42 inches. All other ground signs shall be no higher than six feet.”Source ↗verified 2026-05-02
Required submittals
- Site / elevation plan
- Sign drawing with dimensions + materials
- Structural calc if freestanding
- Electrical detail if illuminated
Inspection sequence
- Footing if freestanding
- Electrical rough-in if illuminated
- Final
Contractor specialties needed
General contractor · Electrician (journey-level 01 or residential 02)
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 sign 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 sign quote.
Notes & caveats
Issuing body is city building dept (structural review) often with planning sign-off (zoning compliance). Electrical permit required for illuminated signs. Historic-district signs get separate review.
How to apply yourself
- 1. Confirm your parcel's zoning & overlays. Run an address lookup for your Mercer Island sign — we'll pull your specific lot polygon, zoning, setbacks, and any shoreline/ECA/historic overlays.
- 2. Assemble submittals: the 4 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
Signs permits in Mercer Island — FAQ
When does a sign need a permit in Mercer Island?
Each city's own sign code, usually a chapter of its zoning or development code, decides which signs need a permit and sets their size, number and placement by zone. Putting up or structurally altering a permanent sign generally needs a city sign permit, plus an electrical permit if the sign is lit, while repainting, ordinary maintenance and copy changes generally do not. Which small or temporary signs need no permit, and up to what size, differs from city to city, so check the city's own list before ordering a sign.
How much does a sign permit cost in Mercer Island?
Mercer Island's design review of a sign by the Code Official is a $910 minimum fee, 5 hours of staff time, with more time at $182 an hour; a lit sign's electrical permit is $46 for a sign on one branch circuit, $9 for each more circuit, with the $46 issuance fee and $214 electrical minimum (2026 Fee Schedule).