Siding permits in Mercer Island: fees, timeline & requirements (2026)
Everything you need to know about pulling a siding 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 — the office that issues the permit at your address, cited to Mercer Island's source.
When does siding replacement need a permit in Mercer Island?
Exempt for non-structural wood and vinyl siding. NOT exempt for veneer, stucco, or exterior finish and insulation systems (EFIS). Exemption does not apply to RCW Chapter 64.55 structures.
How Mercer Island adopted this rule
The threshold comes from the state code (WAC 51.51), which 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 permit required: WRB + flashing details, fastener schedule, WSEC continuous insulation calc if added
Inspection sequence
- WRB / flashing inspection
- Final
Contractor specialties needed
General contractor
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 siding 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 siding quote.
Notes & caveats
From MICC 17.14.010 §105.2: "Painting, non-structural wood and vinyl siding, papering, tiling, carpeting, cabinets, counter tops and similar finish work, provided that existing, required accessible features are not altered. This exemption shall not apply to veneer, stucco or exterior finish and insulation systems (EFIS). This exemption shall not apply to structures regulated under RCW Chapter 64.55."
Siding permit fee estimate in Mercer Island
Worked example for an $18,000 siding project (building permit). Your actual fee scales with project valuation.
| Building permit fee | $490.67 |
| Plan review | $343.47 |
| WA state surcharge | $6.50 |
| Estimated total | $840.64 |
Where re-siding needs a permit on Mercer Island, as veneer, stucco and EIFS do, the building permit is priced on the value of the work: $40.06 up to $500, and $118.83 for the first $2,000 plus $23.24 for each $1,000 more up to $25,000; plan check adds 70% of that fee where plans are reviewed (2026 Fee Schedule). Computed from Mercer Island's adopted fee schedule · source ↗. Land use, fire and engineering review, intake, impact and utility fees, where they apply, are charged separately.
How to apply yourself
- 1. Check who issues the permit. Run an address lookup for your siding replacement in Mercer Island — we'll confirm which office issues the permit at that address.
- 2. Assemble submittals: the document 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 (about $841 for an $18,000 project) 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
Siding permits in Mercer Island — FAQ
When does siding replacement need a permit in Mercer Island?
Exempt for non-structural wood and vinyl siding. NOT exempt for veneer, stucco, or exterior finish and insulation systems (EFIS). Exemption does not apply to RCW Chapter 64.55 structures.
How much does a siding permit cost in Mercer Island?
For a $18,000 siding project, the estimated Mercer Island permit fee is about $840.64 (building fee $490.67 + plan review $343.47 + surcharges) from Mercer Island's adopted fee schedule. Land use, fire and engineering review, intake, impact and utility fees, where they apply, are charged separately.