Best Licensed General Contractors in Altadena, CA
83 general contractors registered in Altadena 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; 84 registered in Altadena
- 33 of Altadena's 84 licenses (39.3%) carry current workers' compensation cover, not liability insurance; a blank usually means an owner-operator with no employees
- Median time licensed in Altadena: 15 years
- Longest Altadena licensure: since 1947
- 1,744 county licenses reach their expiration date within 90 days
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- Verified
- August 22, 2026
- Licensed since
- 1947
- Phone
- (323) 660-4141
- Verified
- August 22, 2026
- Licensed since
- 1982
- Phone
- (626) 798-9525
- Verified
- August 22, 2026
- Licensed since
- 1986
- Phone
- (661) 547-0109
- Verified
- August 22, 2026
- Licensed since
- 1986
- Phone
- (626) 798-0104
- Verified
- August 22, 2026
- Licensed since
- 1989
- Phone
- (626) 791-7870
- Verified
- August 22, 2026
- Licensed since
- 1995
- Phone
- (626) 391-6497
- Verified
- August 22, 2026
- Licensed since
- 1999
- Phone
- (323) 257-0979
- Verified
- August 22, 2026
- Licensed since
- 2001
- Phone
- (818) 612-9242
Compare the top 6 at a glance
| Company | License | Workers' comp | Licensed since |
|---|---|---|---|
| Electro Construction Corp | #95881 | On file | 1947 |
| Grueter Construction Corp | #416414 | On file | 1982 |
| Kendra Designs | #494052 | On file | 1986 |
| Halpin Brothers Inc. | #501705 | On file | 1986 |
| Action Duct Cleaning Company Inc. | #570541 | On file | 1989 |
| Derek Gaddes Construction | #710337 | 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, 84 of them registered in Altadena. CSLB also publishes a real original issue date, which Washington's registry does not, so tenure is measurable here: the median Altadena license has been held 15 years, and the longest-standing one dates to 1947. 33 of Altadena's 84 licenses (39.3%) 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 Altadena: common questions
How many licensed general contractors are there in Altadena?
84 active B general building contractor licenses are registered in Altadena, out of 20,659 across Los Angeles County. 83 Altadena-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. 84 active B general building contractor licenses are registered in Altadena and 20,659 across Los Angeles County, the longest-standing issued in 1947. 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 33 of Altadena's 84 currently carry. 1,744 Los Angeles County licenses expire within 90 days.