Bathroom remodel permits in Sammamish: fees, timeline & requirements (2026)
Everything you need to know about pulling a bathroom remodel permit in Sammamish, Washington — when one is required, what it costs, how long review takes, what documents are required, and which inspections you can expect. Cited to Sammamish Community Development.
Free lookup, no account needed — the office that issues the permit at your address, and a layout of the room, cited to Sammamish's source.
When does a bathroom remodel need a permit in Sammamish?
Bathroom remodels are processed as a Single-Family Residential Remodel permit. A Sewer Availability Certificate is required when the project exceeds 50% of the assessed value or includes additional plumbing fixtures; like-for-like finish work is exempt.
In the source's own words
“Required when the proposed project exceeds 50% of the assessed value of the property, or the project includes additional plumbing fixtures.”Source ↗verified 2026-05-29
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 contractor · Plumber
Who can do this work in Sammamish?
Kolmo Construction is a licensed Washington general contractor — KOLMOL*753JS, active through April 10, 2027, bonded and insured — working throughout Sammamish and King County. Kolmo prepares the drawings and submittals, files the bathroom remodel permit with Sammamish Community Development, carries the project through review and inspections, and performs the construction. Call (206) 410-5100 for a Sammamish bathroom remodel quote.
Notes & caveats
2021 IRC R105.1. GFCI/AFCI required at bathroom outlets per NEC 210.8 + WA amendments. Exhaust fan must vent to exterior (IRC R303). Tile shower waterproofing inspection required (PMG-001 / TCNA-aligned).
Bathroom remodel permit fee estimate in Sammamish
Worked example for a $22,000 bathroom remodel project (building permit). Your actual fee scales with project valuation.
| Building permit fee | $648.57 |
| Plan review | $421.57 |
| Technology surcharge | $160.52 |
| WA state surcharge | $6.50 |
| Estimated total | $1,237.16 |
Sammamish prices a bathroom remodel's building permit on the value of the work: $142.05 up to $500, $236.77 for the first $2,000 plus $20.59 for each $1,000 more up to $25,000, and $710.28 for the first $25,000 plus $11.37 for each $1,000 more up to $50,000, with plan review at 65% of the permit fee. Planning's review of a remodel's building application is a $753 flat fee, and the energy code review $91. A residential combination plumbing or mechanical permit is $134 for up to 3 items and $45 for each more, and the City's electrical permit is priced on the value of the electrical work, $92.33 up to $250 and $215.45 for the first $2,000 plus $18.73 for each $1,000 more up to $25,000. The City adds a 15% technology fee to each fee (2026 Fee Schedule). Apply via mybuildingpermit.com. Computed from Sammamish'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 bathroom remodel in Sammamish — we'll confirm which office issues the permit at that address, and you can lay out the room.
- 2. Assemble submittals: the 4 documents under Required submittals above.
- 3. Submit through the city portal: Sammamish Community Development ↗
- 4. Track review. Respond to reviewer comments promptly.
- 5. Pay issuance fees (about $1,237 for a $22,000 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 Sammamish Community Development, handles reviewer comments, and builds the project.
Licensed WA general contractor KOLMOL*753JS · bonded & insured
Bathroom remodel permits in Sammamish — FAQ
When does a bathroom remodel need a permit in Sammamish?
Bathroom remodels are processed as a Single-Family Residential Remodel permit. A Sewer Availability Certificate is required when the project exceeds 50% of the assessed value or includes additional plumbing fixtures; like-for-like finish work is exempt.
How much does a bathroom remodel permit cost in Sammamish?
For a $22,000 bathroom remodel project, the estimated Sammamish permit fee is about $1,237.16 (building fee $648.57 + plan review $421.57 + surcharges) from Sammamish's adopted fee schedule. Land use, fire and engineering review, intake, impact and utility fees, where they apply, are charged separately.