Windsor Construction Company
General · Issaquah, WA · License #WINDSCC088CL
Windsor Construction Company is one of 488 General contractors registered in Issaquah, registered with WA L&I since 1992. Registered longer than roughly 75% of General contractors in Issaquah. Current filings: $30,000 surety bond (continuous) and $1,000,000 liability coverage through Aug 14, 2027.
How confident can you be in Windsor Construction Company?
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 — Windsor Construction Company 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 Issaquah.
Do they have jobs on record?
Not yet measured — Windsor Construction Company 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
- Feb 13, 1992
- Expiration date
- May 1, 2027
- UBI
- 601363086
- Business type
- Partnership
- Phone
- (425) 882-3151
- Location
- Issaquah, WA 98027
Source: WA L&I contractor registration — checked Sep 26, 2026. Applies to every row above.
Registration is current through May 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 |
|---|---|---|---|
| Western Surety Co | $30,000 | Mar 27, 2025 | Continuous — until canceled |
| Western Surety Co | $12,000 | Nov 17, 2023 | Mar 27, 2025 |
| Insurance company | Amount | Agency | Effective | Expiration |
|---|---|---|---|---|
| Zurich American Ins Co | $1,000,000 | — | Aug 14, 2025 | Aug 14, 2027 |
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 |
|---|---|
| Knk Inc | Feb 13, 1992 |
| Gng Inc | Feb 13, 1992 |
| Glenn Thomas Gronnerud | Apr 12, 2011 |
| Kenneth William Sinner | Apr 12, 2011 |
| Nathan William Sinner | Apr 14, 2023 |
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 488 General contractors registered in Issaquah.
Looking for reviews of Windsor Construction Company?
Subser doesn't have reviews or star ratings. This page shows Windsor Construction Company's WA L&I record — registration status, bond and liability coverage, and principals on file — plus any endorsements from other licensed contractors.
Own Windsor Construction Company? Claim the listing free. Worked with Windsor Construction Company? Endorse them from your own listing.
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Built from Washington State L&I public records, updated Sep 26, 2026. Subser doesn't do star ratings or reviews — just verified records.