General contractor · Covington, WA

Mainstream Air Ltd

Active Washington registration MAINSAL751RJ · per L&I records

LicensedBondedInsured

Is Mainstream Air Ltd Licensed?

Washington L&I records list Mainstream Air Ltd with registration number MAINSAL751RJ and status ACTIVE, valid until Dec 11, 2027. The business address on file is in Covington, WA 98042.

License Details

License #: MAINSAL751RJ
Status: ACTIVE
License type: Construction Contractor
Specialty: General
First effective: Dec 11, 2025
Expires: Dec 11, 2027
Business type: Corporation
UBI (state business ID): 605985579
City: Covington, WA 98042

Bond and Insurance on File

Surety bond: $30,000 · Nationwide Mutual Ins Co
Effective Oct 27, 2025 · Until Canceled
Liability insurance: $1,000,000 · SELECTIVE INSURANCE COMPANY OF
Expires Dec 3, 2026

What Active Status Means

The registration is current: L&I has a bond and liability insurance on file and the term has not ended. ACTIVE is necessary but not sufficient, so also check the expiry date, the bond and the insurance below.

Can this business work under this registration? Can work while it stays active.

The registration has 406 days left before it expires on Dec 11, 2027. Check that date against your project timeline.

All status codes are explained in Washington Contractor License Statuses Explained.

How This Record Compares in Covington

Mainstream Air Ltd has held registration MAINSAL751RJ for less than a year. The median for the 145 active general contractors with a Covington address is 5.6 years, and 31 of them have held their registration for 10 years or more, so this registration is newer than most in Covington. 20 of them registered in the last 12 months.

100% of these Covington records have a surety bond on file and 100% have liability insurance on file. The median insurance amount on file is $1,000,000; this business lists $1,000,000, which is equal to that median. Insurance amounts are what the insurer reported to L&I; they are not a rating of the business.

Record Timeline

Oct 27, 2025: $30,000 surety bond with Nationwide Mutual Ins Co took effect.
Dec 11, 2025: Current registration MAINSAL751RJ took effect.
Oct 30, 2026: Our copy of the L&I record was taken.
Dec 3, 2026: SELECTIVE INSURANCE COMPANY OF liability policy on file expires.
Dec 11, 2027: Registration expires unless renewed.

Checks for General Contractors

General contractors must file a $30,000 surety bond (RCW 18.27.040, effective July 1, 2024). This record lists a $30,000 bond. See General vs Specialty Contractor Registration in Washington.
Use a general contractor when the project involves more than one trade. Subcontractors on your job must be registered too.
Compare bids on scope, schedule and payment terms, not just the total.
More detail: How to Choose a General Contractor in Washington.

How to Verify This Contractor

Use the Confirm on L&I Verify button and search registration MAINSAL751RJ or UBI 605985579. The status there is the official one.
Check that the name on your bid or contract matches Mainstream Air Ltd exactly (a corporation).
On L&I Verify, look for bond claims, lawsuits and any newer registration.
Ask for a certificate of insurance sent directly by the insurer, and compare it with the SELECTIVE INSURANCE COMPANY OF policy on file.

A full walkthrough is in How to Check a Contractor License in Washington.

Record data as of Oct 30, 2026, from the Washington L&I contractor file.

Other General Contractors in Covington

Active general contractor registrations with a Covington address in the same L&I file. Listing here is not an endorsement.

A C E Improvements · General · expires Oct 27, 2028
A R D S Contracting Inc · General · expires May 8, 2027
A1 Sealcoating & Landscaping · General · expires Apr 21, 2028
Accelerated Industrial · General · expires Sep 17, 2027
Air Advantage Heating/Clng LLC · General · expires Dec 3, 2027
Ak Kreutzer Construction LLC · General · expires Jul 29, 2028
All City Sawing & Drilling LLC · General · expires May 26, 2028
Allcityglass · General · expires Oct 19, 2028

Accuracy notice. Data from Washington L&I open data (public domain, PDDL), not affiliated with any government. Records change; confirm on the official L&I Verify tool before hiring. Search other businesses with the Washington contractor license lookup.

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