Roofing permits in Mercer Island: fees, timeline & requirements (2026)
Everything you need to know about pulling a roofing / re-roof 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 a re-roof need a permit in Mercer Island?
Permit required when: sheathing is replaced OR the type of roofing material is changed. Exempt: in-kind re-roofing of one- and two-family dwellings provided the roof sheathing is not removed or replaced.
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
- Scope description
- Manufacturer underlayment + flashing details
Inspection sequence
- Mid-roof / underlayment
- 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 roofing / re-roof 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 roofing / re-roof quote.
Notes & caveats
From MICC 17.14.010 §105.2: "In-kind re-roofing of one- and two-family dwellings provided the roof sheathing is not removed or replaced" is exempt. The Mercer Island Residential Building Permits page lists a separate Re-Roof Permits section indicating that re-roof permits are required when sheathing is replaced or when the type of roofing material is changed.
How to apply yourself
- 1. Check who issues the permit. Run an address lookup for your re-roof in Mercer Island — we'll confirm which office issues the permit at that address.
- 2. Assemble submittals: the 2 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
Roofing permits in Mercer Island — FAQ
When does a re-roof need a permit in Mercer Island?
Permit required when: sheathing is replaced OR the type of roofing material is changed. Exempt: in-kind re-roofing of one- and two-family dwellings provided the roof sheathing is not removed or replaced.
How much does a roofing / re-roof permit cost in Mercer Island?
Where a re-roof needs a permit on Mercer Island, re-roofing a single-family house is a $214 permit, except with the same roofing system or masonry tile (2026 Fee Schedule).