Keystone General Construction Co
Moorpark · Ventura County · CA
Verified
Bestopedia verdict
California’s contractor board lists Keystone General Construction Co with a license standing of CLEAR. A contractor bond is on file, and workers’ compensation coverage is current.
- License standing
- 25 / 25
- Clean record
- 15 / 15
- Track record
- 24.2 / 30
- License continuity
- 10 / 10
- Workers' comp
- 9 / 12
- Contractor bond
- 8 / 8
The verified record
- CSLB license
- #509108 verify on CSLB ↗
- Classifications
- A, B, HAZ
- Years licensed
- 39.2 years since 04/15/1987
- Contractor bond
- $25,000 American Contractors Indemnity Company
- Workers’ comp
- Current
- Business type
- Sole Owner
- Qualifying principal
- Jon David Zwirn
- Address of record
- P O Box 454, Moorpark, CA 93021
Frequently Asked Questions
Is Keystone General Construction Co a licensed General Contractor contractor in California?
Yes. Keystone General Construction Co holds California CSLB contractor license #509108 with a B (General Building) classification. Current CSLB status: CLEAR (as of July 2026).
What work is Keystone General Construction Co licensed to perform?
Keystone General Construction Co is licensed for B (General Building), plus additional classifications: A, HAZ.
Is Keystone General Construction Co bonded?
Yes. Keystone General Construction Co carries contractor's bond #100946256 for $25,000 through American Contractors Indemnity Company.
Does Keystone General Construction Co carry workers' compensation insurance?
CSLB records list the workers' compensation status for Keystone General Construction Co as Exempt.
How long has Keystone General Construction Co held its contractor license?
Keystone General Construction Co has held California contractor license #509108 since 04/15/1987, approximately 39 years (as of July 2026).
Where is Keystone General Construction Co located?
Keystone General Construction Co is based in Moorpark, Ventura County, CA 93021.