California contractor license classifications
Five classes have their own page. The full list is on CSLB's site ↗.
- C-10ElectricalA C-10 contractor does the electrical work on a building or a site: the wiring, the panels, the fixtures, and the equipment that carries or uses electrical power. That includes battery storage and solar when the work is part of the electrical system. The sentence that controls the class is the board's regulation, and the board can change it. Read that page before you decide a job is inside or outside the license.
- C-36PlumbingThe plumbing specialty as CSLB defines it. Read the official description before you decide a job is inside or outside the license. The sentence that controls the class is the board's regulation, and the board can change it.
- C-7Low voltage systemsCommunication, signal, and other systems the board places in the low-voltage class. Read the official description before you treat a job as in or out. The sentence that controls the class is the board's regulation, and the board can change it.
- C-61Limited specialtyA C-61 license is a narrow trade that does not have its own numbered class. CSLB lists the specialties under this license. This page is not one of those sub-trades. Read the board's classification before you treat a job as inside this license.
- C-47General manufactured housingInstalling, altering, repairing, or preparing to move a manufactured home, mobilehome, or multifamily manufactured home, including the foundation. On a single-family site, the class also covers connecting gas, water, sewer, and electrical utilities to the home. The sentence that controls the class is the board's regulation, and the board can change it.