Best Licensed Concrete Contractors in Diamond Bar, CA
3 concrete companies registered in Diamond Bar hold current CSLB licenses, verified against official records as of August 17, 2026. All 3 are listed below, ordered by years licensed.
- 778 active C-8 concrete licenses in Los Angeles County; 3 registered in Diamond Bar
- California requires workers' compensation cover for C-8 licensees: 3 of Diamond Bar's 3 licenses (100.0%) carry a current policy with CSLB
- Median time licensed in Diamond Bar: 18 years
- Longest Diamond Bar licensure: since 2006
- 63 county licenses reach their expiration date within 90 days
We earn a fee when you call businesses through numbers on this site. This never affects who is listed or how they rank.
- Verified
- August 17, 2026
- Licensed since
- 2006
- Phone
- (909) 629-8000
- Verified
- August 17, 2026
- Licensed since
- 2008
- Phone
- (800) 786-3255
- Verified
- August 17, 2026
- Licensed since
- 2015
- Phone
- (909) 732-4656
Compare the top 3 at a glance
| Company | License | Workers' comp | Licensed since |
|---|---|---|---|
| Ct & T Concrete Paving Inc. | #875627 | On file | 2006 |
| Falkon Construction Inc. | #911791 | On file | 2008 |
| Sundial Concrete Constructors | #1009010 | On file | 2015 |
Los Angeles County concrete licensure at a glance
California licenses contractors by classification and CSLB publishes one on every record, so supply can be counted exactly: 778 active C-8 concrete licenses in Los Angeles County, 3 of them registered in Diamond Bar. CSLB also publishes a real original issue date, which Washington's registry does not, so tenure is measurable here: the median Diamond Bar license has been held 18 years, and the longest-standing one dates to 2006. California law requires workers' compensation cover for C-8 licensees, so it is a legal baseline rather than a way to tell two contractors apart: 3 of Diamond Bar's 3 licenses (100.0%) carry a current policy in CSLB's file, and we do not rank on it. The contractor bond is not a signal here: 776 of the county's 778 licenses carry the same $25,000 bond California sets by statute. 63 county licenses reach their expiration date within the next 90 days. CSLB cannot link straight to a license record, so every listing above shows its number for you to type into CSLB's license lookup. How we verify.
Concrete Contractors in Diamond Bar: common questions
How many licensed concrete contractors are there in Diamond Bar?
3 active C-8 concrete licenses are registered in Diamond Bar, out of 778 across Los Angeles County. 3 Diamond Bar-registered companies passed our license verification, and all 3 are listed on this page. Only licenses CSLB shows as CLEAR and unexpired are listed.
Does California license concrete contractors?
Yes. California licenses contractors by classification, and C-8 is the CSLB classification that authorises this work. 3 active C-8 concrete licenses are registered in Diamond Bar and 778 across Los Angeles County, the longest-standing issued in 2006. Only CLEAR, unexpired licenses appear here.
How do I check a concrete contractor's license in California?
Every listing above shows its CSLB license number. CSLB cannot link straight to a record, so open its license lookup and type the number in: it shows status, expiration, the contractor bond and workers' compensation cover, which California requires of C-8 licensees and 3 of Diamond Bar's 3 currently carry. 63 Los Angeles County licenses expire within 90 days.