California Contractor License Classifications

Section 7055 sorts the contracting business into general engineering, general building and specialty work. In addition to those three, the legislature created B-2 Residential Remodeling in section 7057.5. Within the C branch, CSLB's classification list runs to more than 40 numbered trades plus C-61 Limited Specialty, and a single license can carry as many classifications as the holder can qualify for, each with its own qualifier.

Apart from the classifications themselves, CSLB issues two certifications: ASB Asbestos Certification and HAZ Hazardous Substance Removal Certification. Each has its own application and exam, and neither is a stand-alone license.

Section 7056 defines the A contractor by fixed works that need specialized engineering knowledge and skill. The list is long: irrigation, drainage, water supply, flood control, harbors and docks, dams, railroads, highways and streets, tunnels, airports, sewers and treatment plants, bridges, pipelines for petroleum and other fluids, parks and playgrounds, refineries and power plants, and the excavating, grading, trenching, paving and concrete work tied to those projects.

The A trade exam reflects that range. Its study guide gives the largest share, 21 percent, to subsurface, surface and elevated piping work including shoring and sloping excavations, with safety at 18 percent and both planning and earthwork at 15 percent.

Under section 7057, a B contractor works on structures that shelter or enclose people, animals or property and that require at least two unrelated building trades. The B license comes with a rule that trips up many new licensees: for a prime contract that involves trades other than framing or carpentry, the job must call for at least two unrelated trades other than framing or carpentry, or the B contractor must hold the needed classification or hire a licensed specialty subcontractor. Framing and carpentry do not count toward the two trades.

A B contractor may take framing or carpentry work on its own, as either a prime contract or a subcontract. A B contractor may not contract for a project that includes C-16 Fire Protection or C-57 Well Drilling work unless it holds that specialty license or subcontracts it to someone who does.

Section 7057.5 created a narrower general license for improvements to existing residential wood-frame structures. A B-2 contract must include three or more unrelated trades, which may include drywall, finish carpentry, flooring, insulation, painting, plastering, roof repair, siding, tile, and replacing electrical, plumbing or mechanical fixtures. The B-2 contractor may do the work or sub it out.

The restrictions matter. A B-2 contractor may not make structural changes to load-bearing parts such as footings, foundations, bearing walls or roof structures. It may not install, replace, substantially alter or extend electrical, mechanical or plumbing systems without the right classification or a licensed subcontractor, although minor alterations needed to swap fixtures are allowed within a three-trade job. C-16, C-22 and C-57 work also requires the matching license or a subcontractor.

Section 7058 defines a specialty contractor as one whose work requires special skill and whose principal business uses specialized building trades. Each C classification then has a regulation describing its scope. A few examples show how specific the language gets:

C-61 covers specialty work that does not fit any other C classification. CSLB tracks it through D subcategories such as D-3 Awnings, D-6 Concrete Related Services, D-28 Doors, Gates and Activating Devices, D-39 Scaffolding, D-52 Window Coverings and D-64 Non-specialized. The registrar endorses the accepted scope on the license, and the holder must stay inside it. Many older D codes have been folded into regular C classifications, for example D-11 Fencing into C-13 and D-14 Floor Covering into C-15.

C-61 is the only classification with no trade exam. CSLB's study guide list states that none exists, and its exam step confirms that all other classifications require one. A C-61 applicant still needs four years of experience in the specific scope and must still pass the Law and Business exam. Other specialty contractors may also do C-61 type work when it relates to their own classification and follows established industry practice.

Some classifications carry obligations beyond the exam. C-8 Concrete, C-20 HVAC, C-22 Asbestos Abatement, C-39 Roofing and tree service licensees must carry workers' compensation even with no employees. Hazardous Substance Removal Certification is available only to holders of A, B, C-12, C-21, C-36, C-57 or C-61/D-40 licenses, and asbestos-certified contractors may abate only within classifications they already hold. If you are still weighing which classification to pursue, ContractorPrepHQ has trade practice for many of the major California classifications, each bundled with Law and Business practice for $149.