What is a CSLB license?
Answered by Netanel Presman, General Contractor (CSLB #1105249) · Updated
Short answer
A CSLB license is a license issued by the California Contractors State License Board, which regulates all California contractors. California law requires a CSLB license for any construction contract over $500 in combined labor and materials. License classes include A (general engineering), B (general building), B-2 (residential remodeling), and dozens of C-specialty classes. License numbers typically have 6-7 digits.
In detail
CSLB is the state regulator for California's roughly 280,000 licensed contractors. The license is the primary legal proof that a contractor can lawfully enter contracts over $500 in California.
License class structure:
- Class A — General Engineering Contractor — public works, infrastructure, civil engineering. Rare for residential.
- Class B — General Building Contractor — the most common residential license. Can perform or subcontract any trade necessary for a complete building.
- Class B-2 — Residential Remodeling Contractor (introduced 2024) — narrower scope than B, specifically for residential remodels and alterations. Cannot do structural ground-up new construction.
- Class C — 40+ specialty classes, each for a single trade. A few of the most common:
- - C-10 — Electrical
- - C-20 — HVAC
- - C-33 — Painting / Decorating
- - C-36 — Plumbing
- - C-39 — Roofing
- - C-45 — Sign
- - C-46 — Solar
- - C-50 — Reinforcing Steel
- - C-54 — Tile
How CSLB licenses are issued:
- Qualifying Individual (QI) — every license has at least one QI, either a Responsible Managing Employee (RME) or Responsible Managing Officer (RMO). The QI must pass a trade exam, a law-and-business exam, and prove 4 years of journey-level experience.
- Bond — minimum $25,000 contractor's bond, plus workers' compensation coverage if employees exist.
- Examination — both trade and law-and-business exams required before licensure.
- Ongoing fees — biennial renewal, continuing education for certain classes.
What a homeowner should know:
- Never hire a contractor for work over $500 in California without verifying the license. Contracting without a license is a misdemeanor under B&P Code §7028.
- The license class must match the scope. A C-10 electrician alone cannot remodel a kitchen, because kitchens require structural, plumbing, and electrical — that's a B or B-2.
- The QI must be "actively engaged" in the licensed entity. Some contractors improperly "rent" a QI (pay a licensed person to list their name) — that's rampant abuse CSLB actively investigates.
AskBaily's California scoping verifies license class match + active status before any match.
Sources
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