License verified · Washington L&I

Mainstream Mechanical Corp

8600 MAIN ST

Verification ledger

What we checked, and what we didn't

Checked against the register at build time (Oct 31, 2026).

Washington contractor licenseWashington State Department of Labor & Industries · number MAINSM*945JF · expires April 24, 2028. Matched to this business on name.Verified

Business contactphone on file.On file

Public reviewsNo public review profile in our data. License-register listings often have none — ask for two recent local references instead.None found

Insurance & bondingNot checked by AirProHQ. Ask for the certificate of insurance before work starts — the state requires cover to hold the license, but we don't see the policy.Ask them

WorkmanshipNot inspected. A license says who is allowed to do the job, not how well it was done.Ask for references

Checked against the register at build time (Oct 31, 2026). Confirm it yourself — about thirty seconds. See our full verification methodology.Open the official lookup

About

Mainstream Mechanical Corp, in brief

Based at 8600 MAIN ST, Mainstream Mechanical Corp works as an HVAC contractor. Washington L&I records show license MAINSM*945JF on file for this business through April 2028. Another listed HVAC contractor sits 1.2 mi from here.

HVAC contractor

Questions about this contractor

Before you call Mainstream Mechanical Corp

Does Mainstream Mechanical Corp hold a valid Washington license?

Yes. License number MAINSM*945JF appears on the Washington L&I register with an expiry of April 24, 2028. You can confirm it yourself on the official license lookup.

Sources: Washington State Department of Labor & Industries register.Report a correction

Alternatives

Other HVAC contractors near Mainstream Mechanical Corp

Sorted by straight-line distance from this office. Same license check on every one.

Verified1.2 mi