In California, a general contractor cannot do electrical work on just a Class B license. Business and Professions Code Section 7057 requires a B-license holder to either carry the C-10 electrical contractor classification or hand the electrical scope to a properly licensed subcontractor.1California Legislative Information. California Business and Professions Code BPC 7057 – General Building Contractor There is no dollar threshold that lets a general contractor wire a circuit, swap a panel, or pull cable on the strength of a B license alone, and the common claim that small amounts of electrical work are allowed under an “incidental and supplemental” rule is a misreading of the statute.
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 with plumbing and tile, or a room addition with drywall and HVAC, is the kind of work the B license is designed to manage.
BPC 7057(b) draws the line on self-performance. A general building contractor can take on a project involving specialty trades only when the job genuinely involves two or more unrelated trades beyond framing and carpentry, when the contractor holds the specialty license for that work, or when the contractor subcontracts it to someone who does.1California Legislative Information. California Business and Professions Code BPC 7057 – General Building Contractor Framing and carpentry are the only trades a B contractor can self-perform without an additional classification. Electrical is not one of them.
The C-10 Electrical Contractor classification covers installing, connecting, or repairing wires, fixtures, appliances, conduits, or solar photovoltaic cells that generate or use electrical energy.3Contractors State License Board. C-10 Electrical Contractor Classification Running new circuits for a remodel, upgrading a service panel, adding outlets, installing lighting — all of it sits inside C-10. To qualify, an applicant needs at least four years of journey-level experience, with up to three years coming from training or apprenticeship and at least one year of hands-on work, plus passing scores on a trade exam and a law and business exam.4Contractors State License Board. Step 3 Qualifying Experience for the Examination
The “Incidental and Supplemental” Rule Does Not Apply
This is where most of the confusion lives. BPC Section 7059 allows a specialty contractor to perform work outside their classification when it is “incidental and supplemental” to their licensed trade.5California Legislative Information. California Business and Professions Code BPC 7059 – Classifications The implementing regulation, 16 CCR Section 831, defines that term to mean work “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 closely, that exception runs to specialty contractors, not generals. A C-36 plumber who cuts a small patch of drywall to reach a pipe can rely on it. A C-39 roofer replacing a few damaged boards during a re-roof can rely on it. A B-license general contractor is not a specialty contractor, so this provision does not let a B pick up a trade the license does not cover. The CSLB’s own Building Officials Guide confirms that, for B contractors, the “incidental and supplemental” concept is used only to decide whether certain work counts as a separate trade under the two-trade rule.7Contractors State License Board. Building Officials Guide
You will see claims online that a general contractor can do up to $750 of electrical work under this rule. No California statute or regulation sets a $750 threshold for incidental electrical work. Neither BPC 7059 nor 16 CCR 831 contains any dollar figure.8California Legislative Information. California Code BPC 7059 – Classifications Relying on that number is a route to a disciplinary case.
There is a separate minor-work exemption under BPC 7048: a license is not required for any project where labor and materials together total less than $1,000 and the work is casual enough that no building permit is required. Assembly Bill 2622, signed in 2024, raised the threshold from $500 to $1,000.9California Legislative Information. California Code BPC 7048 Because almost any electrical work past replacing a switch or receptacle needs a permit, this exemption rarely helps.
The Two Legal Options for a B Contractor
When a job involves electrical work, a general contractor has two choices that keep them inside the law.
The usual option is subcontracting. The general contractor keeps overall project management and hands the electrical scope to a licensed C-10 contractor, who handles everything that touches the electrical system. The general contractor is responsible for making sure that subcontractor is properly licensed.
The other option is adding the C-10 classification to the existing B license. That means meeting the same four-year experience requirement and passing the C-10 trade exam.4Contractors State License Board. Step 3 Qualifying Experience for the Examination Once both classifications appear on the license record, the same contractor can legally self-perform the electrical scope.
If you are hiring a general contractor for work that involves electrical, ask who is doing the wiring. If the answer is the general’s own crew, ask to see a C-10 classification on their license. If the answer is a subcontractor, ask for that subcontractor’s license number. Do not accept a vague assurance that the crew “can handle it.” A crew pulling wire without a C-10 is doing unlicensed work.
What Happens if a B Contractor Does Electrical Work Anyway
The exposure comes from two directions. Performing work outside your classification is on its own a cause for CSLB disciplinary action, which can mean suspension or revocation of the license. It is also treated the same as contracting without a license under BPC Section 7028, which is a misdemeanor.
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 a minimum of 90 days in jail.
- Third or subsequent 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 civil side. California courts have consistently held that an unlicensed contractor cannot enforce a construction contract or recover payment for the work. A general contractor who self-performs electrical work without a C-10 risks losing the ability to collect on the entire contract, not just the electrical portion.
If You Are a Homeowner, Not a Contractor
Different rules apply if you own the property and plan to do the work yourself. BPC Section 7044 exempts owners who build or improve structures on their own land, as long as the work is not intended for sale and the owner either does the labor personally or uses only their own employees.10California Legislative Information. California Code BPC 7044 Owners improving a principal residence get a somewhat broader version of the exemption, provided they have lived there at least 12 months before the work is finished and do not sell the property immediately after.
The exemption removes the licensing requirement. It does not remove the permit and inspection requirements. A homeowner rewiring a bathroom still needs an electrical permit, still needs to pass inspection, and still has to meet the current California Electrical Code. If you are not confident in your electrical skills, the owner-builder exemption is not a reason to try the work yourself.
Verifying a License Before You Hire
Before signing a contract, run the license through the CSLB’s online “Check A License” tool. You can search by license number, business name, or the contractor’s personal name.11Contractors State License Board. Check A License The record shows current status, every active classification, bond status, and any disciplinary history. If a contractor claims both B and C-10, confirm both appear.
If the general contractor is subcontracting the electrical work, get the subcontractor’s license number and verify the C-10 yourself. It takes about 30 seconds and prevents inheriting unpermitted, uninspected electrical work that becomes the property owner’s problem.