California regulates fire protection with two parallel systems, and the split trips up building owners constantly: construction-style work runs through the Contractors State License Board (CSLB), while service specialties run through the Office of the State Fire Marshal under CAL FIRE. Which credential your vendor needs depends on the system they're touching.
Who licenses what in California
| Work | Credential | Issued by |
|---|---|---|
| Fire sprinklers & fixed fire protection systems | C-16 Fire Protection contractor license | CSLB |
| Fire alarm systems | C-10 Electrical (C-7 Low Voltage for limited scopes) | CSLB |
| Portable fire extinguisher service | Licensed extinguisher concern + certified technicians | State Fire Marshal (CAL FIRE) |
| Fixed extinguishing systems (kitchen hoods, special hazard) | Licensed fixed-system service concern + certified technicians | State Fire Marshal |
Full-service companies in California typically hold a CSLB license and State Fire Marshal service licenses. That's normal — but it means verifying them takes two lookups, not one.
The C-16: California's core fire protection license
The C-16 Fire Protection classification is what allows a company to lay out, install, modify, and service fire sprinkler systems. When you check a C-16 at the CSLB, look past the license number: confirm the status is active, the bond is in place, workers' compensation coverage is current (a common lapse), and the license entity matches the name on your proposal. The CSLB lookup shows all of this free, along with any disciplinary history.
The State Fire Marshal side
Extinguisher service and fixed-system service (your restaurant hood suppression, clean-agent systems, and the like) run on State Fire Marshal licenses — companies are licensed as service concerns and the technicians who actually tag your equipment carry individual certificates. The certificate number belongs on the service tag. If a hood-service tag in a California kitchen has no license number on it, the fire marshal and the health inspector will both notice before you do — our kitchen hood service guide covers what a compliant visit looks like.
Why the split matters
The classic California mistake is assuming one impressive-looking license covers everything. A C-16 does not authorize extinguisher tagging; an extinguisher concern license does not authorize sprinkler work; and alarm work under the wrong classification can void the permit. California AHJs — among the strictest in the country, especially in Los Angeles, San Francisco, and San Diego — check this on plan submittals and inspection reports. Verify each line of work separately, and see our general license verification guide for the questions to ask.
Find California companies with credentials shown where verified: Los Angeles, San Francisco, San Diego, or search your city.