Mainstream Air Ltd
General · Covington, WA · License #MAINSAL751RJ
Mainstream Air Ltd is one of 274 General contractors registered in Covington, registered with WA L&I since 2025. Current filings: $30,000 surety bond (continuous) and $1,000,000 liability coverage through Dec 3, 2026. Principals on record since 2025.
How confident can you be in Mainstream Air Ltd?
Are they licensed, bonded, and insured?
Active license, $30,000 bond and $1,000,000 liability on file — checked against WA L&I records, updated daily.
Are they who they say they are?
Not yet verified — Mainstream Air Ltd hasn't claimed this listing. Own this business? Claim it free.
Do other pros stand behind them?
No endorsements yet from other licensed contractors in Covington.
Do they have jobs on record?
Not yet measured — Mainstream Air Ltd hasn't run jobs through Subser. Performance data comes from real jobs, not reviews.
Subser doesn't do star ratings or reviews — just verified records. What do these mean?
License facts
- License type
- CONSTRUCTION CONTRACTOR
- Effective date
- Dec 11, 2025
- Expiration date
- Dec 11, 2027
- UBI
- 605985579
- Business type
- Corporation
- Phone
- (253) 222-8998
- Location
- Covington, WA 98042
Source: WA L&I contractor registration — checked Sep 27, 2026. Applies to every row above.
Registration is current through Dec 2027.
Is this your business? Claim it free to verify ownership — takes about two minutes.
Claim this free listingBond & insurance on file
| Bond firm | Amount | Effective | Expiration |
|---|---|---|---|
| Nationwide Mutual Ins Co | $30,000 | Oct 27, 2025 | Continuous — until canceled |
| Insurance company | Amount | Agency | Effective | Expiration |
|---|---|---|---|---|
| SELECTIVE INSURANCE COMPANY OF | $1,000,000 | — | Dec 3, 2025 | Dec 3, 2026 |
What the bond and insurance requirements mean for homeowners
Registration as a general contractor in Washington requires a $30,000 surety bond on file with the Department of Labor & Industries. This contractor's current filing shows a $30,000 bond.
The bond is a limited fund a homeowner (or subcontractor or supplier) can make a claim against, through the courts, if a registered contractor fails to meet its obligations on a job. Contractors must also keep general liability insurance on file — at least $50,000 in property damage and $200,000 in public liability coverage, or a $250,000 combined single limit — which covers damage the contractor causes, not workmanship disputes. The rows above are the bond and insurance filings L&I publishes for this registration; whether a specific filing applies to a specific project depends on its dates and terms.
Principals
| Name | Start date |
|---|---|
| Garret Clayton Bergquist | Dec 11, 2025 |
| Holden Riley Bergquist | Dec 11, 2025 |
What is a General contractor licensed to do in Washington?
A general contractor in Washington is registered with the Department of Labor & Industries to perform or oversee work in multiple building trades. General contractors can take on whole projects — remodels, additions, new construction — and can hire specialty subcontractors for individual trades. A $30,000 surety bond and general liability insurance, filed with WA L&I, are required for this registration. Washington currently lists 274 General contractors registered in Covington.
Looking for reviews of Mainstream Air Ltd?
Subser doesn't have reviews or star ratings. This page shows Mainstream Air Ltd's WA L&I record — registration status, bond and liability coverage, and principals on file — plus any endorsements from other licensed contractors.
Own Mainstream Air Ltd? Claim the listing free. Worked with Mainstream Air Ltd? Endorse them from your own listing.
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Built from Washington State L&I public records, updated Sep 27, 2026. Subser doesn't do star ratings or reviews — just verified records.