Guides · State ladders
Every week, California plumbers search for a license the state does not issue. Here is the system that actually exists.
California licenses plumbing businesses through the Contractors State License Board (CSLB): the C-36 plumbing contractor license. It is held for the business by a qualifying individual — an owner or a Responsible Managing Employee (RME) — who must show 4 years of journey-level experience within the last 10 years, pass the exams, and post a $25,000 contractor bond. The RME must work at least 32 hours a week for the company and can qualify only one active license.
A level of experience, not a credential. Your journey-level years are the currency the qualifier exam accepts — which makes documenting them the whole game. Plumbers moving into California convert their out-of-state license into experience credit; nothing is endorsed.
Work under $1,000 total (labor and materials), needing no permit, done solo, can fall under California's minor-work exemption (raised from $500 on January 1, 2025 — most web content still quotes the old $500). Above the line without a license is unlicensed contracting: a misdemeanor, and under California law an unlicensed contractor can be barred from suing for payment at all.
The transfer checker shows the California conversion for your state pair; the full system is on the California page.
