Cornerstone Construction Co
Diamond Bar · Los Angeles County · CA
Verified
Bestopedia verdict
California’s contractor board lists Cornerstone 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
- 25.7 / 30
- License continuity
- 10 / 10
- Workers' comp
- 9 / 12
- Contractor bond
- 8 / 8
The verified record
- CSLB license
- #427183 verify on CSLB ↗
- Classifications
- B, C-9
- Years licensed
- 43.9 years since 08/26/1982
- Contractor bond
- $25,000 Hudson Insurance Company
- Workers’ comp
- Current
- Business type
- Sole Owner
- Qualifying principal
- Richard Lee Baugh
- Address of record
- 1860 S Tintah Drive, Diamond Bar, CA 91765
Frequently Asked Questions
Is Cornerstone Construction Co a licensed General Contractor contractor in California?
Yes. Cornerstone Construction Co holds California CSLB contractor license #427183 with a B (General Building) classification. Current CSLB status: CLEAR (as of July 2026).
What work is Cornerstone Construction Co licensed to perform?
Cornerstone Construction Co is licensed for B (General Building), plus additional classifications: C-9.
Is Cornerstone Construction Co bonded?
Yes. Cornerstone Construction Co carries contractor's bond #30044171 for $25,000 through Hudson Insurance Company.
Does Cornerstone Construction Co carry workers' compensation insurance?
CSLB records list the workers' compensation status for Cornerstone Construction Co as Exempt.
How long has Cornerstone Construction Co held its contractor license?
Cornerstone Construction Co has held California contractor license #427183 since 08/26/1982, approximately 44 years (as of July 2026).
Where is Cornerstone Construction Co located?
Cornerstone Construction Co is based in Diamond Bar, Los Angeles County, CA 91765.