Best Licensed General Contractors in Diamond Bar, CA
133 general contractors registered in Diamond Bar hold current CSLB licenses, verified against official records as of August 22, 2026. The 8 below are the top-ranked, ordered by workers' compensation cover and years licensed.
- 20,659 active B general building contractor licenses in Los Angeles County; 140 registered in Diamond Bar
- 50 of Diamond Bar's 140 licenses (35.7%) carry current workers' compensation cover, not liability insurance; a blank usually means an owner-operator with no employees
- Median time licensed in Diamond Bar: 6 years
- Longest Diamond Bar licensure: since 1976
- 1,744 county licenses reach their expiration date within 90 days
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- Verified
- August 22, 2026
- Licensed since
- 1987
- Phone
- (909) 622-6927
- Verified
- August 22, 2026
- Licensed since
- 1987
- Phone
- (909) 348-2542
- Verified
- August 22, 2026
- Licensed since
- 1988
- Phone
- (909) 598-5658
- Verified
- August 22, 2026
- Licensed since
- 1992
- Phone
- (909) 843-6465
- Verified
- August 22, 2026
- Licensed since
- 1993
- Phone
- (714) 883-8969
- Verified
- August 22, 2026
- Licensed since
- 1995
- Phone
- (310) 990-9663
- Verified
- August 22, 2026
- Licensed since
- 1997
- Phone
- (714) 620-5670
- Verified
- August 22, 2026
- Licensed since
- 1998
- Phone
- (626) 731-5406
Compare the top 6 at a glance
| Company | License | Workers' comp | Licensed since |
|---|---|---|---|
| Kertland Roofing Inc. | #510174 | On file | 1987 |
| Place Construction & Development Inc. | #515653 | On file | 1987 |
| Perspective Landscaping Inc. | #541581 | On file | 1988 |
| Duke Builders Corp | #635180 | On file | 1992 |
| Arkius Inc. | #673454 | On file | 1993 |
| Cfp Construction Inc. | #700920 | On file | 1995 |
Los Angeles County general building licensure at a glance
California licenses contractors by classification and CSLB publishes one on every record, so supply can be counted exactly: 20,659 active B general building contractor licenses in Los Angeles County, 140 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 6 years, and the longest-standing one dates to 1976. 50 of Diamond Bar's 140 licenses (35.7%) carry current workers' compensation cover in CSLB's file. That is employee injury cover, not liability insurance, and a blank usually means an owner-operator with no employees - lawful, and not a mark against anyone. The contractor bond is not a signal here: 20,631 of the county's 20,659 licenses carry the same $25,000 bond California sets by statute. 1,744 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.
General Contractors in Diamond Bar: common questions
How many licensed general contractors are there in Diamond Bar?
140 active B general building contractor licenses are registered in Diamond Bar, out of 20,659 across Los Angeles County. 133 Diamond Bar-registered companies passed our license verification, and the 8 on this page are the top-ranked of those. Only licenses CSLB shows as CLEAR and unexpired are listed.
Does California license general contractors?
Yes. California licenses contractors by classification, and B is the CSLB classification that authorises this work. 140 active B general building contractor licenses are registered in Diamond Bar and 20,659 across Los Angeles County, the longest-standing issued in 1976. Only CLEAR, unexpired licenses appear here.
How do I check a general 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 50 of Diamond Bar's 140 currently carry. 1,744 Los Angeles County licenses expire within 90 days.
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