A general contractor cannot do electrical work in California on a Class B license alone. To perform electrical work legally, a B-license holder must either add the C-10 Electrical Contractor classification to their license or subcontract the electrical scope to someone who holds a C-10. This comes straight from Business and Professions Code Section 7057, and there is no dollar-value carve-out that lets a B contractor wire a circuit, swap a panel, or run new lines on the side.1California Legislative Information. California Business and Professions Code BPC 7057 – General Building Contractor
What the Class B License Covers
The Contractors State License Board issues the Class B General Building Contractor license for projects that involve at least two unrelated building trades, not counting framing or carpentry.2Contractors State License Board. California Business and Professions Code 7057 – General Building Contractor A kitchen remodel that touches plumbing and tile, or a room addition with drywall and HVAC, is the kind of job the B license was built for.
Section 7057(b) sets the limits. A B contractor can hold the prime contract on a multi-trade job, but they can only self-perform the specialty trades if they also hold the specialty license for that work. Otherwise the specialty work has to go to a properly licensed subcontractor.1California Legislative Information. California Business and Professions Code BPC 7057 – General Building Contractor Framing and carpentry are the only trades a B contractor can perform themselves without additional classification. Electrical is not on that short list.
Why Electrical Requires a C-10
The C-10 Electrical Contractor classification covers installing, connecting, or repairing any wires, fixtures, appliances, conduits, or solar photovoltaic equipment that generates or uses electrical energy.3Contractors State License Board. C-10 Electrical Contractor Classification That scope is deliberately broad. Wiring an outlet, upgrading a breaker panel, running new circuits for a remodel, installing lighting — all of it sits inside the C-10.
Qualifying for a C-10 takes at least four years of journey-level electrical experience. Up to three of those years can come from technical training, apprenticeship, or education, but at least one year has to be hands-on.4Contractors State License Board. Step 3 Qualifying Experience for the Examination Applicants then pass a trade exam and a law and business exam. The bar is set high because mistakes in electrical work create fire and electrocution hazards that can stay hidden inside a wall for years.
The “Incidental and Supplemental” Rule Is Not a Loophole
Most of the confusion on this question traces back to BPC Section 7059, which allows work “incidental and supplemental” to a licensed trade.5California Legislative Information. California Business and Professions Code BPC 7059 – Classifications The regulation defining that term, 16 CCR Section 831, says the outside work must be “essential to accomplish the work in which the contractor is classified.”6Legal Information Institute. California Code of Regulations 16 CCR 831 – Incidental and Supplemental Defined
Read it closely. That exception is written for specialty contractors doing a small amount of adjacent work needed to complete their own trade. A plumber cutting a patch of drywall to reach a pipe fits. A roofer replacing a few damaged boards while re-roofing fits. A B-license general contractor picking up electrical work does not fit, because the B license is not a specialty classification and electrical is not “essential to accomplish” some other trade the B contractor is performing. The CSLB’s Building Officials Guide confirms that for B contractors, “incidental and supplemental” only matters when deciding whether a job satisfies the two-trade rule in the first place.7Contractors State License Board. Building Officials Guide
You will also see claims online that a general contractor can perform up to $750 of electrical work under the incidental rule. That number is not in the statute or the regulation. Neither BPC 7059 nor 16 CCR 831 sets a dollar threshold of any kind.8California Legislative Information. California Code BPC 7059 – Classifications Relying on it is a good way to end up in front of the licensing board.
The Two Legal Paths
When a project involves electrical work, a B contractor has two lawful options.
The common one is to subcontract the electrical scope to a licensed C-10. The general contractor keeps overall project management, and the C-10 handles everything that touches the electrical system. The general contractor is responsible for making sure the sub is actually licensed for the work.
The other option is for the B contractor to earn the C-10 classification themselves by meeting the four-year experience requirement and passing the trade exam.4Contractors State License Board. Step 3 Qualifying Experience for the Examination Once both classifications sit on the license, the same contractor can self-perform electrical work.
If you are hiring a general contractor for a job that includes wiring, ask for the electrical subcontractor’s license number up front. Do not accept vague reassurances that the crew “can handle it.” If employees of a B-only contractor are pulling wire, the work is unlicensed.
What Happens if a B Contractor Does Electrical Anyway
The consequences come from two directions at once.
First, working outside a held classification is itself grounds for CSLB discipline, up to suspension or revocation of the license. Second, unlicensed work in a classification you don’t hold is treated the same as contracting without any license, which is a misdemeanor under BPC Section 7028.
The criminal penalties climb with each offense:
- First offense: a fine up to $5,000 and up to six months in county jail.
- Second offense: a fine of 20 percent of the contract price or $5,000, whichever is greater, plus at least 90 days in jail.
- Third or later offense: a fine between $5,000 and the greater of $10,000 or 20 percent of the contract price, plus 90 days to one year in jail.
Then there is the money side. California courts have held that unlicensed contractors cannot enforce contracts or collect payment for work that required a license they didn’t have. A B contractor who self-performs the electrical portion of a remodel risks losing the ability to collect on the entire contract, not just the electrical part.
If You Are the Homeowner, Different Rules
The licensing rules above govern contractors. If you own the property and are doing the work yourself, BPC Section 7044 provides an owner-builder exemption for structures you build or improve on your own land, as long as the work isn’t for sale and you perform the labor personally or use your own employees.9California Legislative Information. California Code BPC 7044 The exemption removes the contractor license requirement. It does not remove the permit and inspection requirement, and it does not extend to a general contractor’s employees working on someone else’s property.
Verify the License Before You Hire
Every active California contractor license is searchable on the CSLB’s “Check A License” tool by license number, business name, or personal name.10Contractors State License Board. Check A License The result shows license status, every classification the contractor holds, bond information, and any disciplinary history. If a general contractor tells you they hold both B and C-10, both should appear on the record. If they are subcontracting the electrical work, get the sub’s license number and confirm the C-10 classification the same way. It takes under a minute and it is the difference between a documented, inspected electrical system and one that becomes your problem the day you try to sell.