KEYSTONE GENERAL CONSTRUCTION CO
License
- Status
- CLEAR
- First issued
- April 15, 1987
- Expires
- April 30, 2027
- Entity
- Sole Owner
- Address of record
- P O BOX 454, Moorpark, CA 93021
- Phone of record
- (818) 398 5511
Contractor bond
- Surety
- AMERICAN CONTRACTORS INDEMNITY COMPANY
- Bond number
- 100946256
- Amount
- $25,000
- Effective
- April 2, 2025
Workers’ compensation
This contractor has certified to the state that they have no employees, so they carry no workers’ compensation policy. The exemption covers only the license holder. If anyone else works on your project — a crew, a helper, a day laborer — they are not covered, and an injury on your property can become your liability. Ask who will physically be on site.
Are they licensed for your job?
A California contractor may only contract for work their classification covers. Pick the job and this reads the license on file against it.
Licensed to perform
- A General Engineering Contractor
- B General Building Contractor
- HAZ Hazardous Substance Removal Certification
A contractor may only contract for work within their classifications. See all 18 licensed general engineering contractors in Moorpark.
People on this license
| Name | Title | Since | Through |
|---|---|---|---|
| ZWIRN JON DAVID | Sole Owner | April 15, 1987 | Current |
| ZWIRN JON DAVID | Sole Owner | March 13, 1992 | Current |
| ZWIRN JON DAVID | Sole Owner | January 13, 2009 | Current |
| ZWIRN JON DAVID | Sole Owner | February 25, 1993 | April 14, 2004 |
| ZWIRN JON DAVID | Sole Owner | March 6, 2000 | January 1, 2004 |
Verified status badge
Put this on your website or in a bid packet. It reads the state’s record live every time someone loads it, so it is never a screenshot of a good day. Free, and you don’t need to claim this listing to use it.
<a href="https://bookofbuilders.com/license/509108" target="_blank" rel="noopener">
<img src="https://bookofbuilders.com/badge/509108.svg" alt="KEYSTONE GENERAL CONSTRUCTION CO — California contractor license #509108 status, verified against CSLB records" width="268" height="76">
</a>The badge shows whatever the CSLB record says — including a suspension or lapsed coverage. There is no paid version and no way to change what it displays. That is what makes it worth showing. The same data as JSON if you’d rather build your own.
Is this your license?
Claim this page to add your photos, description, service area and contact details. The state’s record above stays exactly as it is — claiming adds to a page, it never edits or hides anything the CSLB reports.
Source: California Contractors State License Board public records. Coverage lapse is evaluated against today’s date; all other fields reflect the latest weekly CSLB file. Confirm at the CSLB’s official record before signing a contract.