Bathroom remodel permits in City of Sammamish: fees, timeline & requirements (2026)
Everything you need to know about pulling a bathroom remodel permit in City of 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 Apply via MyBuildingPermit.com..
Free lookup, no account needed — your lot polygon, zoning, setbacks and overlays, cited to City of Sammamish's source.
When does a bathroom remodel need a permit in City of 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 2026-09-24
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, plumbing
Who can do this work in City of Sammamish?
Kolmo Construction is a licensed Washington general contractor — KOLMOL*753JS, active through April 10, 2027, bonded and insured — working throughout City of Sammamish and King County. Kolmo prepares the drawings and submittals, files the bathroom remodel permit with Apply via MyBuildingPermit.com., carries the project through review and inspections, and performs the construction. Call (206) 410-5100 for a City of 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 — Washington baseline, not City of Sammamish's own schedule
Worked example for a $22,000 bathroom remodel project (building permit). Your actual fee scales with project valuation.
| Building permit fee | $349.25 |
| Plan review | $227.01 |
| WA state surcharge | $6.5 |
| Estimated total | $582.76 |
Fees set by jurisdiction. Plus separate electrical, plumbing, and mechanical permits. Apply via https://mybuildingpermit.com. We have not read City of Sammamish's adopted fee schedule, so this is not City of Sammamish's fee: it walks the standard valuation table most Washington cities adopt by reference, as a rough guide. The real numbers are in City of Sammamish's fee schedule ↗. Impact/utility fees may apply separately.
How to apply yourself
- 1. Confirm your parcel's zoning & overlays. Run an address lookup for your City of Sammamish bathroom remodel — we'll pull your specific lot polygon, zoning, setbacks, and any shoreline/ECA/historic overlays.
- 2. Assemble submittals (4).
- 3. Submit through the city portal: Apply via MyBuildingPermit.com. ↗
- 4. Track review. Respond to reviewer comments promptly.
- 5. Pay issuance fees (Fees set by jurisdiction. Plus separate electrical, plumbing, and mechanical permits. Apply via https://mybuildingpermit.com.) and pick up the permit. Inspection card travels with the job.
Or have Kolmo do it
We pull bathroom remodel permits in City of Sammamish every month. We prepare the drawings and submittals, file with Apply via MyBuildingPermit.com., handle reviewer comments, and build the project.
Licensed WA general contractor KOLMOL*753JS · bonded & insured
Bathroom remodel permits in City of Sammamish — FAQ
When does a bathroom remodel need a permit in City of 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 City of Sammamish?
For a $22,000 bathroom remodel project, the estimated City of Sammamish permit fee is about $582.76 — building fee $349.25 + plan review $227.01 + surcharges. Fees scale with project valuation per the city schedule.