C-36 Plumbing Contractors in California must carry specific insurance to maintain their CSLB license and win commercial and residential jobs. Here are the 2026 requirements.
## Required Insurance for C-36 Plumbers
**General Liability:** $1M per occurrence minimum. Most GCs and property managers require a certificate of insurance (COI) before you start work.
**Workers' Compensation:** Generally relevant when employees are present; applicability depends on current California rules, ownership, classification, and business facts. Under SB 1455 Phase 2 (January 1, 2028), all C-36 contractors will be required to carry WC even as sole proprietors.
**Commercial Auto:** Required if using work vehicles. A plumber's van needs commercial auto, not personal auto.
**Contractor Bond:** $25,000 CSLB bond required for all active licensees.
## C-36 Insurance Rates in California
Typical monthly cost: pricing varies by classification, payroll, operations, claims history, limits, and underwriting/month for a full bundle. WCIRB class code 5183 applies to plumbing work.
Call (858) 925-9555 for a timely C-36 plumbing contractor insurance quote.