Koester Construction
Koester Construction operating as a sole owner is licensed in California under CSLB number 682133. The license was first issued in 1993, putting the business at 33 years on the active CSLB roster. It carries a single CSLB classification: B — General Building Contractor. Records show an active surety bond on file with Merchants Bonding Company (mutual) and active workers' compensation coverage from Norguard Insurance Company. The business is based in Concord, in Contra Costa County, California.
- License Number
- 682133
- Issued
- Dec 14, 1993
- Status
- CLEAR
- Expires
- Dec 31, 2027
- Entity
- Sole Owner
- Surety
- Merchants Bonding Company (mutual)
- Bond Number
- 101741342
- Effective
- Jan 1, 2026
- Status
- Active
- Coverage
- Workers' Compensation Insurance
- Carrier
- Norguard Insurance Company
- Policy Number
- JOWC670589
- Effective
- Aug 12, 2025
- Expires
- Aug 12, 2026
This contractor is verified, with no adverse conditions in the current CSLB record.
An automated summary of public CSLB data, not a credit score, rating, or endorsement. How we determine this
Is Koester Construction licensed in California?
Yes. Koester Construction holds California Contractors State License Board license number 682133. The license was first issued on December 14, 1993. It is valid through December 31, 2027.
What does Koester Construction specialize in?
Koester Construction is licensed for one CSLB classification: B General Building Contractor.
Where is Koester Construction headquartered?
Koester Construction is headquartered at P O Box 6538, Concord, CA 94524, in Contra Costa County, California.
Does Koester Construction have an active surety bond on file with CSLB?
Yes. Koester Construction has an active California contractor surety bond filed with Merchants Bonding Company (mutual).
Does Koester Construction carry workers' compensation coverage?
Yes. Koester Construction carries active workers' compensation coverage through Norguard Insurance Company.
How do I verify Koester Construction's contractor license?
You can verify Koester Construction's license directly with the California Contractors State License Board at https://www.cslb.ca.gov/OnlineServices/CheckLicenseII/LicenseDetail.aspx?LicNum=682133.
- License issuedDec 14, 1993
- WC coverage startsAug 12, 2025
- Bond activeJan 1, 2026
- WC expiresAug 12, 2026
- License expiresDec 31, 2027
- Contra Costa Electric INC#139885Martinez·A General Engineering Contractor
- Scott Edward W Electric CO INC#190426Richmond·A General Engineering Contractor
- Lyons W E Construction CO#180607Walnut Creek·A General Engineering Contractor
- Enterprise Roofing Service INC#221274Concord·B General Building Contractor
- Strand Builders#221887Walnut Creek·B General Building Contractor
- Martinez Sheet Metal INC#222277Martinez·B General Building Contractor
- Conco#199902Concord·A General Engineering Contractor
- R F G General Contractor#203084Concord·B General Building Contractor