Skip to content
State files updated Nov 1, 2026
Look up a contractor
MenuClose

Home / License lookup / Washington / Diamond Plumbing & Heating LLC

Washington contractor license

Diamond Plumbing & Heating LLC

Diamond Plumbing & Heating LLC of Edmonds holds Washington license DIAMOPH791NT (PC-01 Journey Level). The L&I file dated Nov 1, 2026 lists it as active.1 It expires Sep 24, 2027.

Licensed 5 years, longer than 80% of 2,008 active Washington plumbing contractors.

Active

Diamond Plumbing & Heating LLC, Edmonds

License
DIAMOPH791NT
Class
PC-01 Journey Level
Expires
Sep 24, 2027
Bond
$6,000
Liability insurance
$1,000,000 to Mar 12, 2027

L&I file dated Nov 1, 2026

From the L&I file dated Nov 1, 2026. Not a consumer report; check the board before you hire.

Has the board taken action on this license?

None in the L&I file dated Nov 1, 2026. Confirm with the board: L&I contractor lookup

What bond, insurance and workers' comp are on file?

Bond
$6,000Nationwide Mutual Ins Co, from Sep 10, 2026, continuous
Liability insurance
$1,000,000Trisura Specialty Insurance Co, from Mar 12, 2026, to Mar 12, 2027
Workers' comp
Not in the L&I fileCheck with the board

What work does this license cover?

License level: Plumbing Contractor. Issued Sep 24, 2021.

What other licenses does this business hold?

Which other Edmonds businesses hold PC-01 Journey Level?

Washington plumbing contractors

What should you check before hiring?

What to ask before you hire

  1. Get the license number in writing. The name on the license should match the name on your contract and invoice.
  2. Check the class covers the job. A license for one trade doesn't cover another. Washington license classes
  3. Ask for a certificate of insurance sent to you by the insurance agent, not handed over by the contractor. How to read a COI
  4. Ask who will be on site. If a crew works on your property, ask for proof of workers' comp. The L&I file doesn't record workers' comp, so ask for the certificate.
  5. Put it in a written contract: license number, price, start date and payment schedule. Check the license again on the day you sign.

If the license is lapsed

  1. Don't sign or pay a deposit until the L&I shows the license active again.
  2. Ask the contractor why. For a bond or insurance lapse, ask for proof that the new bond or policy was filed with the L&I, then check again.
  3. If work has started, hold further payments, keep the contract, receipts and photos, and file a complaint with Department of Labor and Industries (L&I).
  4. Check another contractor. Washington license lookup

Sources

  1. L&I contractor license data (data.wa.gov, Nov 1, 2026)
  2. Department of Labor and Industries (L&I)