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Washington contractor license

Mainstream Mechanical Corp

Mainstream Mechanical Corp of Edmonds holds Washington license MAINSMC943K2 (EC-6A Hvac/Rfrg). The L&I file dated Oct 30, 2026 lists it as active.1 It expires May 22, 2028.

Licensed 20 years, longer than 76% of 1,203 active Washington HVAC contractors.

Active

Mainstream Mechanical Corp, Edmonds

License
MAINSMC943K2
Class
EC-6A Hvac/Rfrg
Expires
May 22, 2028
Bond
$4,000

L&I file dated Oct 30, 2026

From the L&I file dated Oct 30, 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 Oct 30, 2026. Confirm with the board: L&I contractor lookup

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

Bond
$4,000Lexon Ins Co, from Mar 10, 2012, continuous
Liability insurance
None on file
Workers' comp
Not in the L&I fileCheck with the board

What work does this license cover?

License level: Electrical Contractor. Issued May 22, 2006.

What other licenses does this business hold?

Where are other licensed Washington contractors listed?

Washington HVAC 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, Oct 30, 2026)
  2. Department of Labor and Industries (L&I)