Best Licensed Low Voltage Contractors in San Francisco, CA
49 low voltage companies registered in San Francisco hold current CSLB licenses, verified against official records as of August 17, 2026. The 8 below are the top-ranked, ordered by workers' compensation cover and years licensed.
- 52 active C-7 low voltage systems licenses in San Francisco County; 52 registered in San Francisco
- 33 of San Francisco's 52 licenses (63.5%) carry current workers' compensation cover, not liability insurance; a blank usually means an owner-operator with no employees
- Median time licensed in San Francisco: 14 years
- Longest San Francisco licensure: since 1978
- 5 county licenses reach their expiration date within 90 days
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- Verified
- August 17, 2026
- Licensed since
- 1978
- Phone
- (415) 725-0785
- Verified
- August 17, 2026
- Licensed since
- 1984
- Phone
- (415) 252-1955
- Verified
- August 17, 2026
- Licensed since
- 1985
- Phone
- (415) 775-8513
- Verified
- August 17, 2026
- Licensed since
- 1989
- Phone
- (415) 777-1151
- Verified
- August 17, 2026
- Licensed since
- 1989
- Phone
- (415) 695-9555
- Verified
- August 17, 2026
- Licensed since
- 1991
- Phone
- (415) 824-8500
- Verified
- August 17, 2026
- Licensed since
- 1994
- Phone
- (415) 673-5050
- Verified
- August 17, 2026
- Licensed since
- 1998
- Phone
- (415) 355-1990
Compare the top 6 at a glance
| Company | License | Workers' comp | Licensed since |
|---|---|---|---|
| Tony's Windows And Glass Inc. | #352757 | On file | 1978 |
| Twilight Security & Investigation Inc. | #463356 | On file | 1984 |
| Warman Security | #470224 | On file | 1985 |
| Microbiz Service Company | #576734 | On file | 1989 |
| Bbi Engineering Inc. | #582743 | On file | 1989 |
| United California Hvac | #628422 | On file | 1991 |
San Francisco County low voltage licensure at a glance
California licenses contractors by classification and CSLB publishes one on every record, so supply can be counted exactly: 52 active C-7 low voltage systems licenses in San Francisco County, 52 of them registered in San Francisco. CSLB also publishes a real original issue date, which Washington's registry does not, so tenure is measurable here: the median San Francisco license has been held 14 years, and the longest-standing one dates to 1978. 33 of San Francisco's 52 licenses (63.5%) 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: 52 of the county's 52 licenses carry the same $25,000 bond California sets by statute. 5 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.
Low Voltage Contractors in San Francisco: common questions
How many licensed low voltage contractors are there in San Francisco?
52 active C-7 low voltage systems licenses are registered in San Francisco, out of 52 across San Francisco County. 49 San Francisco-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 low voltage contractors?
Yes. California licenses contractors by classification, and C-7 is the CSLB classification that authorises this work. 52 active C-7 low voltage systems licenses are registered in San Francisco and 52 across San Francisco County, the longest-standing issued in 1978. Only CLEAR, unexpired licenses appear here.
How do I check a low voltage 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 San Francisco's 52 currently carry. 5 San Francisco County licenses expire within 90 days.
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