Best Licensed Low Voltage Contractors in San Ramon, CA
13 low voltage companies registered in San Ramon 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.
- 124 active C-7 low voltage systems licenses in Contra Costa County; 13 registered in San Ramon
- 7 of San Ramon's 13 licenses (53.8%) carry current workers' compensation cover, not liability insurance; a blank usually means an owner-operator with no employees
- Median time licensed in San Ramon: 11 years
- Longest San Ramon licensure: since 1988
- 8 county licenses reach their expiration date within 90 days
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- Verified
- August 17, 2026
- Licensed since
- 1988
- Phone
- (925) 838-8444
- Verified
- August 17, 2026
- Licensed since
- 2006
- Phone
- (925) 498-2340
- Verified
- August 17, 2026
- Licensed since
- 2008
- Phone
- (925) 556-6212
- Verified
- August 17, 2026
- Licensed since
- 2014
- Phone
- (510) 538-6445
- Verified
- August 17, 2026
- Licensed since
- 2015
- Phone
- (925) 383-8049
- Verified
- August 17, 2026
- Licensed since
- 2022
- Phone
- (925) 250-1989
- Verified
- August 17, 2026
- Licensed since
- 2023
- Phone
- (510) 706-5989
- Verified
- August 17, 2026
- Licensed since
- 2005
- Phone
- (925) 803-9240
Compare the top 6 at a glance
| Company | License | Workers' comp | Licensed since |
|---|---|---|---|
| Defentec Security | #547780 | On file | 1988 |
| Ridge Communications Inc. | #874356 | On file | 2006 |
| Paramount Home Theater | #914677 | On file | 2008 |
| Ranger Installations Inc. DBA Ranger Audio Video Integration | #999202 | On file | 2014 |
| Cal Tech Security Services Inc. | #1000133 | On file | 2015 |
| D & D Constructors Inc. | #1095287 | On file | 2022 |
Contra Costa 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: 124 active C-7 low voltage systems licenses in Contra Costa County, 13 of them registered in San Ramon. CSLB also publishes a real original issue date, which Washington's registry does not, so tenure is measurable here: the median San Ramon license has been held 11 years, and the longest-standing one dates to 1988. 7 of San Ramon's 13 licenses (53.8%) 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: 124 of the county's 124 licenses carry the same $25,000 bond California sets by statute. 8 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 Ramon: common questions
How many licensed low voltage contractors are there in San Ramon?
13 active C-7 low voltage systems licenses are registered in San Ramon, out of 124 across Contra Costa County. 13 San Ramon-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. 13 active C-7 low voltage systems licenses are registered in San Ramon and 124 across Contra Costa County, the longest-standing issued in 1988. 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 7 of San Ramon's 13 currently carry. 8 Contra Costa County licenses expire within 90 days.
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