Plumbing permits in Sammamish: fees, timeline & requirements (2026)
Everything you need to know about pulling a plumbing 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, cited to Sammamish's source.
When does plumbing work need a permit in Sammamish?
Fixture additions/relocations and water/drain piping require a plumbing permit; stopping leaks, clearing stoppages, and removing/reinstalling water closets (without replacing valves/pipes/fixtures) are exempt. A Residential Fixture Count form is required; a Sewer Availability Certificate is required when fixtures are added.
In the source's own words
“Stopping leaks in drains/pipes; clearing stoppages; repairing/removing water closets (without valve/pipe/fixture replacement).”Source ↗verified 2026-05-29
Required submittals
- Fixture count + DFU calc for repipes
- Water heater specs
- Sewer line plan if site work involved
Inspection sequence
- Rough-in / pressure test
- Final
Contractor specialties needed
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 manages the plumbing job from start to finish: a licensed plumbing contractor performs the work and the permit, and Kolmo coordinates the scope, schedule, inspections and any related construction. Call (206) 410-5100 for a Sammamish plumbing quote.
Notes & caveats
Water heater: T&P relief, expansion tank required if pressure >80psi or check valve installed. Sewer line: cleanouts at every 100ft + change of direction. Backwater valve required in flood zones.
How to apply yourself
- 1. Check who issues the permit. Run an address lookup for your plumbing work in Sammamish — we'll confirm which office issues the permit at that address.
- 2. Assemble submittals: the 3 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 (Sammamish's fee schedule sets them) and pick up the permit. Inspection card travels with the job.
Or have Kolmo do it
Kolmo runs the job: a licensed plumbing contractor does the plumbing work and pulls the permit, and Kolmo coordinates the scope, schedule, inspections and any related construction.
Licensed WA general contractor KOLMOL*753JS · bonded & insured
Plumbing permits in Sammamish — FAQ
When does plumbing work need a permit in Sammamish?
Fixture additions/relocations and water/drain piping require a plumbing permit; stopping leaks, clearing stoppages, and removing/reinstalling water closets (without replacing valves/pipes/fixtures) are exempt. A Residential Fixture Count form is required; a Sewer Availability Certificate is required when fixtures are added.
How much does a plumbing permit cost in Sammamish?
Sammamish's stand-alone residential plumbing permit is a $134 flat fee for each fixture, such as a tub, shower, sink, toilet or pressure reducing valve; a combination plumbing permit is $134 for up to 3 items and $45 for each more. A new house's plumbing is a $314 flat fixture fee. The City adds a 15% technology fee to each fee (2026 Fee Schedule). Apply via https://mybuildingpermit.com.