Best Licensed Roofers in Diamond Bar, CA
5 roofing companies registered in Diamond Bar hold current CSLB licenses, verified against official records as of August 17, 2026. All 5 are listed below, ordered by years licensed.
- 1,145 active C-39 roofing licenses in Los Angeles County; 5 registered in Diamond Bar
- California requires workers' compensation cover for C-39 licensees: 5 of Diamond Bar's 5 licenses (100.0%) carry a current policy with CSLB
- Median time licensed in Diamond Bar: 13 years
- Longest Diamond Bar licensure: since 1987
- 96 county licenses reach their expiration date within 90 days
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- Verified
- August 17, 2026
- Licensed since
- 1987
- Phone
- (909) 622-6927
- Verified
- August 17, 2026
- Licensed since
- 1998
- Phone
- (888) 915-7663
- Verified
- August 17, 2026
- Licensed since
- 2012
- Phone
- (626) 488-4759
- Verified
- August 17, 2026
- Licensed since
- 2025
- Phone
- (909) 715-3994
- Verified
- August 17, 2026
- Licensed since
- 2025
- Phone
- (909) 780-7181
Compare the top 5 at a glance
| Company | License | Workers' comp | Licensed since |
|---|---|---|---|
| Kertland Roofing Inc. | #510174 | On file | 1987 |
| Sunshine Roofing Inc. | #755126 | On file | 1998 |
| The Hot Mopper | #978099 | On file | 2012 |
| Imperium Roofing Inc. | #1141782 | On file | 2025 |
| Park S Roofing Usa | #1142782 | On file | 2025 |
Los Angeles County roofing licensure at a glance
California licenses contractors by classification and CSLB publishes one on every record, so supply can be counted exactly: 1,145 active C-39 roofing licenses in Los Angeles County, 5 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 13 years, and the longest-standing one dates to 1987. California law requires workers' compensation cover for C-39 licensees, so it is a legal baseline rather than a way to tell two contractors apart: 5 of Diamond Bar's 5 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: 1,140 of the county's 1,145 licenses carry the same $25,000 bond California sets by statute. 96 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.
Roofers in Diamond Bar: common questions
How many licensed roofers are there in Diamond Bar?
5 active C-39 roofing licenses are registered in Diamond Bar, out of 1,145 across Los Angeles County. 5 Diamond Bar-registered companies passed our license verification, and all 5 are listed on this page. Only licenses CSLB shows as CLEAR and unexpired are listed.
Does California license roofers?
Yes. California licenses contractors by classification, and C-39 is the CSLB classification that authorises this work, unlike Texas, which licenses no roofing contractors at all. 5 active C-39 roofing licenses are registered in Diamond Bar and 1,145 across Los Angeles County, the longest-standing issued in 1987. Only CLEAR, unexpired licenses appear here.
How do I check a roofer'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-39 licensees and 5 of Diamond Bar's 5 currently carry. 96 Los Angeles County licenses expire within 90 days.