California Class B General Building Contractor License: Scope, Verification, and What It Covers

The Class B general building classification authorizes a contractor to construct, alter, or repair any structure that requires at least two unrelated building trades or crafts — or to superintend the whole of such a project. It is the broad 'general contractor' license for whole-building work.

There are limits. A B can't take a job that involves only one trade (other than framing or carpentry) unless it holds the matching C-class or subcontracts that work to a properly licensed specialist. And a B can't self-perform certain specialties at all — notably C-16 fire protection and C-57 well drilling — which must be subcontracted to the right specialist.

Start with the license. On the CSLB "Check a License" tool or in this directory, confirm it reads Active and that the classification fits the project — a B for a whole-home build or remodel spanning multiple trades. Match the license to the exact business you're hiring; license numbers don't change when a business name does. Check that the $25,000 contractor bond is on file (Business & Professions Code §7071.6) and that workers' compensation coverage — or a valid exemption — is shown.

General liability insurance — which covers property damage and injuries — is not tracked by CSLB, so ask the contractor for a current certificate of insurance directly from their insurer. 'Licensed and insured' means checking the CSLB record and the insurance certificate, not taking the phrase on a flyer at face value.

Any project where combined labor and materials total $1,000 or more must be performed by a CSLB-licensed contractor — the threshold rose from $500 to $1,000 on January 1, 2025 under Assembly Bill 2622 (Business & Professions Code §7048). Below $1,000, a narrow minor-work exemption can apply only if the job isn't part of a larger project and the worker discloses, in advertising and bids, that they aren't licensed.

On a whole-building project, the general contractor pulls the permits in their own name and is responsible for the licensed subcontractors. For anything beyond a minor repair, look for an Active B (or the matching C-class for a single-trade job).

A general building contractor must carry workers' compensation insurance for any employees. A contractor that genuinely works alone can currently file a no-employee exemption, so the CSLB record may show an exemption rather than a policy — confirm one or the other before you hire.

Senate Bill 1455 will extend that requirement to every CSLB licensee — regardless of employees — on January 1, 2028, with CSLB's exemption-verification process live by January 1, 2027. Five high-risk classifications already carry no exemption at all — C-8 (concrete), C-20 (HVAC), C-22 (asbestos abatement), C-39 (roofing), and D-49 (tree service) — and must hold coverage regardless of employees.