California Contractor License Types: A, B, B-2 and C

California issues four contractor classifications: A for general engineering, B for general building, B-2 for residential remodeling, and C for the specialty trades. Which one you need is decided by the kind of work you do and, for B and B-2, by how many unrelated trades a single contract involves.

The statute names four branches

Section 7055 sets the frame: “For the purpose of classification, the contracting business includes any or all of the following branches: (a) General engineering contracting. (b) (1) General building contracting. (2) Residential remodeling contracting. (c) Specialty contracting.”

The Board’s own labels for those branches are “(A) General Engineering Contractor / (B) General Building Contractor / (B-2) Residential Remodeling Contractor / (C) Specialty Contractor” (CSLB).

Those two lists line up but they are not the same thing. The statute’s letters are subdivisions of a sentence; A, B, B-2 and C are the Board’s classification labels. If you are citing a source for the label “B-2”, cite the Board — although § 7057.5(d) does say the classification “may be cited as the B-2 Residential Remodeling Contractor”.

A — General Engineering

A general engineering contractor’s principal business is “in connection with fixed works requiring specialized engineering knowledge and skill” (§ 7056). The statute then lists the subjects, which is the most useful part — and it is reproduced here in full rather than summarised, because a trade left out of a summary reads as a trade the classification does not cover:

irrigation, drainage, water power, water supply, flood control, inland waterways, harbors, docks and wharves, shipyards and ports, dams and hydroelectric projects, levees, river control and reclamation works, railroads, highways, streets and roads, tunnels, airports and airways, sewers and sewage disposal plants and systems, waste reduction plants, bridges, overpasses, underpasses and other similar works, pipelines and other systems for the transmission of petroleum and other liquid or gaseous substances, parks, playgrounds and other recreational works, refineries, chemical plants and similar industrial plants requiring specialized engineering knowledge and skill, powerhouses, powerplants and other utility plants and installations, mines and metallurgical plants, land leveling and earthmoving projects, excavating, grading, trenching, paving and surfacing work and cement and concrete works in connection with the above-mentioned fixed works.

Section 7056 introduces that list with “including the following divisions or subjects”, so it is the statute’s own enumeration rather than a closed set this page has narrowed.

B — General Building, and the two-trade test

A general building contractor’s principal business is “in connection with any structure built, being built, or to be built, for the support, shelter, and enclosure of persons, animals, chattels, or movable property of any kind, requiring in its construction the use of at least two unrelated building trades or crafts” (§ 7057).

The two-trade test has teeth, and it is § 7057(b) that supplies them. A general building contractor “shall not take a prime contract for any project involving trades other than framing or carpentry unless the prime contract requires at least two unrelated building trades or crafts other than framing or carpentry, or unless the general building contractor holds the appropriate license classification or subcontracts with an appropriately licensed contractor to perform the work.”

Section 7057(b) applies the restriction to subcontracts as well as prime contracts, and closes the obvious way around it: the general building contractor “shall not count framing or carpentry in calculating the two unrelated trades”.

B-2 — Residential Remodeling, and the three-trade test

A residential remodeling contractor works on “improvements to, on, or in an existing residential wood frame structure”, where “the project requires the use of at least three unrelated building trades or crafts for a single contract” (§ 7057.5). It cannot take a contract with fewer than three such trades, and it cannot make “structural changes to load bearing portions of an existing structure”.

C — Specialty

A specialty contractor’s operations “involve the performance of construction work requiring special skill and whose principal contracting business involves the use of specialized building trades or crafts” (§ 7058). C is subdivided into numbered trades, C-2 through C-61 (CSLB). Those numbered classes are what people mean by the California contractor license classifications: C-10 Electrical is one of them, as are C-8 Concrete, C-9 Drywall and C-16 Fire Protection. We do not paraphrase an individual C-subclass here, because each has its own definition and a title is a label rather than a scope — a C-10 electrical contractor license in California is defined by the Board’s entry for C-10, not by the words in its name.

The classification decides which trade exam you sit

Choosing a class is not only a scope decision; it selects the paper. The Board requires two examinations — “Law and Business” plus a trade examination for the classification applied for — with the C-61 Limited Specialty classification exempt from the trade paper, and waivers decided on review (CSLB). So the class you apply in determines which trade examination you prepare for, and a change of class before the exam changes what you are preparing for.

There is no value tier above classification

Article 4 is the whole of the classification law, and every discriminator in it is about the kind of work plus a count of unrelated trades. There is no tier keyed to what a project is worth. If you have worked in a state that gates a license by project value, that concept does not exist here.

Next: the licensing requirements, the trade examination, applying for a classification, or the California contractor license overview.