The short answer
The California C-7 Low Voltage Systems classification, defined at 16 CCR 832.07, covers energy limited communication and low voltage systems not exceeding 91 volts, including structured cabling, telephone, sound, cable television, closed-circuit video and access control. It excludes fire alarm systems, line voltage electrical work, and the sale, installation or monitoring of burglar and intrusion alarm systems, which require a BSIS Alarm Company Operator license. A C-7 license can be verified at cslb.ca.gov under Check a License.
| Regulation | 16 CCR 832.07, Class C-7 Low Voltage Systems |
|---|---|
| Voltage limit | Energy limited, not exceeding 91 volts |
| Excluded | Fire alarm systems (by regulation text) |
| Unlicensed threshold | Under $1,000, no permit, no employees (B&P 7048) |
| Verify at | cslb.ca.gov, Check a License |
| Telelink | CSLB #472017, C-7 Low Voltage Systems |
What the C-7 classification covers under 16 CCR 832.07#
The Contractors State License Board defines every specialty classification in Title 16 of the California Code of Regulations. Section 832.07 covers the Class C-7 Low Voltage Systems Contractor. The regulation describes a contractor who installs, services and maintains communication and low voltage systems that are energy limited and do not exceed 91 volts. It then lists the systems by name: telephone systems, sound systems, cable television systems, closed-circuit video systems, satellite dish antennas, instrumentation and temperature controls, and low voltage landscape lighting.
That list is illustrative, not exhaustive. The regulation says the systems “include, but are not limited to” the ones named. In practice a C-7 covers the work that a general contractor’s Division 27 and Division 28 subcontractor performs on a commercial building: structured cabling for data and voice, fiber optic backbone, wireless access point cabling and mounting, video surveillance, card and mobile credential access control, video intercom and telephone entry, nurse call and emergency call in senior housing, paging and background sound, audio-visual cabling, and CATV distribution in multifamily buildings.
The 91 volt figure comes directly from the regulation and matters when a scope drifts. Power over Ethernet at 802.3bt levels, 24 VDC lock power, 12 VDC camera power and Class 2 control circuits all sit inside the limit. A 120 VAC receptacle for a rack or a dedicated circuit for a UPS does not.
Telelink Business Services is a licensed C-7 Low Voltage Systems Contractor, CSLB License #472017. The company has been in business since 1983. Current bond, insurance and workers’ compensation certificates are provided in the prequalification packet and are summarized on our licenses and certifications page.
What C-7 excludes: fire alarm, line voltage, alarm monitoring#
The most important exclusion is written into the regulation itself. Section 832.07 states that low voltage fire alarm systems are specifically not included. Fire alarm work in California is generally performed under a C-10 Electrical Contractor license and is governed by the California Fire Code and NFPA 72 as adopted by the State Fire Marshal. Fire alarm systems fall outside the C-7 classification. Telelink does not design, install, or service fire alarm systems and coordinates with the project’s fire alarm contractor on pathway sharing, ceiling access and cutover scheduling.
The second exclusion is line voltage. Anything above the energy limited threshold is electrical scope. On a typical network room buildout that means the dedicated circuits, receptacles, the panel work, and bonding the room’s busbar to the building electrical service ground. A C-7 contractor can specify what it needs and show the handoff on drawings, but a C-10 performs it.
The third exclusion is not in the CSLB regulation at all. It comes from the Alarm Company Act, Business and Professions Code section 7590 and following, administered by the Bureau of Security and Investigative Services (BSIS). Under that act, a person who installs, maintains, alters, sells on premises, monitors or services alarm systems for compensation is an alarm company operator and must hold an ACO license. Cameras and access control are installed under the C-7 classification. Burglar and intrusion alarm work and alarm monitoring require a BSIS Alarm Company Operator license, are not offered, and are referred to a licensed alarm company.
How C-7 compares to C-10, C-28, and a BSIS alarm license#
The four licenses most often confused on a low voltage bid list are summarized below. The descriptions are general; the regulation text for each classification is on the CSLB website.
| License | Issued by | Typical scope on a commercial project | Not covered |
|---|---|---|---|
| C-7 Low Voltage Systems | CSLB | Structured cabling, fiber, wireless cabling, CCTV, access control, intercom, nurse call, sound, AV, CATV | Fire alarm, line voltage, alarm monitoring |
| C-10 Electrical | CSLB | Power distribution, panels, dedicated circuits, lighting, fire alarm, and low voltage work when the contractor chooses to self-perform it | Nothing by voltage; scope is a business decision |
| C-28 Lock and Security Equipment | CSLB | Doors and door assemblies, locks, panic and fire rated exit devices, closers, electrified hardware, and electronic access control equipment | Fire alarm |
| BSIS Alarm Company Operator | BSIS | Selling, installing, servicing and monitoring burglar and intrusion alarm systems | Construction trades work that requires a CSLB license |
Two observations from the table shape most Division 28 scopes. First, access control appears under both C-7 and C-28, and the split is usually drawn at the door. Telelink provides the controllers, readers, power supplies, door position switches, request-to-exit devices, cabling and the head end. The electrified strike, maglock, panic device and automatic operator are coordinated with the GC’s Division 08 hardware scope or performed by a licensed C-28 contractor. Second, a C-10 can legally perform almost anything on the low voltage side, so a GC sometimes bundles it. The question for the estimator is whether the bidder will certify the cabling, label to TIA-606 and deliver test results.
The $1,000 exemption in B&P 7048 and commercial work#
Business and Professions Code section 7048 exempts small jobs from the license requirement. As amended by AB 2622, effective January 1, 2025, the exemption applies when the aggregate contract price for labor, materials and everything else is less than $1,000, the work does not require a building permit, and the person doing the work does not employ anyone else to perform or assist with it. Before 2025 the figure was $500 and there was no permit or employee condition.
The statute also closes the obvious loophole: the exemption does not apply where the work is part of a larger operation that is being divided into contracts under $1,000 to evade the license law. It does not apply to anyone who advertises as a contractor.
On a commercial project the exemption is essentially never available. Any low voltage subcontract of practical size exceeds $1,000, most work through a rated wall requires a permit, and a crew means employees. If a bidder tells you the license does not matter because the work is “minor,” that is a reason to check the CSLB record, not an exemption.
How to verify a contractor license on cslb.ca.gov#
The CSLB Check a License tool at cslb.ca.gov accepts a license number, a business name or a personnel name and returns the public record. Reading the record should be part of every bid tabulation. The fields worth checking are listed below.
| Field on the CSLB record | What to confirm |
|---|---|
| License status | Reads Active. Not Expired, Suspended, Inactive or Canceled. |
| Expiration date | Later than your planned completion date, or budget for a renewal check. |
| Business name and entity | Matches the name on the bid exactly, including any DBA shown on the record. |
| Classifications | Includes C-7 for low voltage, and C-10 if the same firm proposes to perform power. |
| Contractor’s bond | On file and active with a surety. The amount required by CSLB is currently $25,000. |
| Workers’ compensation | A policy with carrier and dates. An exemption on a firm that will put a crew on your site is a problem. |
| Personnel | The qualifying individual and any officers, so the person you are dealing with is connected to the license. |
| Complaint disclosure | Any legal action or citation CSLB is permitted to disclose. |
For public works there is a second lookup. Labor Code section 1725.5 requires contractors and subcontractors on public projects to be registered with the Department of Industrial Relations, and the DIR maintains a public registration search. DIR registration and current certificates are provided in the prequalification packet.
License numbers in advertising and bids: B&P 7030.5#
Business and Professions Code section 7030.5 requires every licensed contractor to include its license number in all construction contracts, subcontracts and calls for bid, and in all forms of advertising. That is why a legitimate bid, proposal, business card, truck and website will show the number. CSLB treats a missing number in advertising as a violation, and an unlicensed person who advertises as a contractor faces separate penalties.
The practical use for a buyer is simple. If a proposal arrives with no license number, ask for it before reading the price. If the number does not match the CSLB record for that business name, stop.
What happens when an unlicensed contractor does the work: B&P 7031#
Section 7031 is how the license law is enforced, and it operates on the contract rather than only on the contractor. In general terms, a contractor who was not duly licensed at all times during performance of work that requires a license cannot bring or maintain an action to collect payment for that work. Separately, a person who paid an unlicensed contractor may bring an action to recover all compensation paid for the work. The courts apply these rules strictly, and the substantial compliance exception is narrow and does not help a contractor who was never licensed.
For an owner or GC the consequences run in both directions. Hiring an unlicensed low voltage sub exposes the project to an installation with no enforceable warranty, to insurance gaps if someone is injured, and to a compliance finding on a publicly funded job. The owner may have a claim to recover payments, but the owner also has an uncertified cabling plant that nobody stands behind. Verification up front costs almost nothing by comparison.
Red flags on a low voltage bid#
These are the patterns we see most often when a GC forwards a competing proposal and asks why the numbers are so different.
- No CSLB license number anywhere on the proposal, or a number that returns a different business name.
- A license in a different classification, such as a C-61 limited specialty, offered for a full Division 27 scope.
- Fire alarm, intrusion alarm or alarm monitoring listed as included in a C-7 proposal with no separate C-10 or BSIS licensee named.
- Power, dedicated circuits or panel work included in a C-7 proposal with no C-10 named.
- Workers’ compensation shown as exempt, but the proposal describes a crew.
- No mention of certification testing, labeling standard or as-built documentation, which usually means those items are not priced.
- A request for a large deposit before mobilization, or a price so far below the field that the material alone could not be covered.
None of these prove a bidder is unlicensed, but each one is worth a phone call before award. The Division 27 and 28 specification checklist covers how to write the scope so that these gaps show up during bidding rather than during construction, and our safety and compliance page lists the documents we provide with every prequalification packet.
Next step#
If you are qualifying low voltage bidders for a commercial, institutional or multifamily project in California, request a bid and we will return a proposal with the license number, classifications, insurance summary and scope exclusions stated on the first page. General contractors can find our prequalification documents and standard scope splits on the for general contractors page.
This article is general information for planning and specification, not a bid, engineering advice or legal advice. Codes and standards change; confirm the current edition with the authority having jurisdiction. Scope and price for a specific building come only in a written proposal.