California Contractor Insurance
Asena Capital Insurance Services — California-licensed insurance brokerage serving contractors statewide. Phone: (858) 925-9555. Email: info@asenainsurance.com.
Oakland is home to 125 licensed plumbing contractors (C-36, CSLB September 2026) — #16 in California, about 8% of the 1,591 contractor licenses based here.
Nearby in Alameda County: Hayward (83), Livermore (60), San Leandro (55), Fremont (34).
46% of Oakland's C-36 licensees hold more than one classification — most often B General Building Contractor (29%), C-42 Sanitation System Contractor (12%). Extra classifications can change how carriers rate your general liability and workers' comp, so list every license class when you quote.
Business structure: 49% sole owners, 45% corporations, 4% LLCs; median time licensed 15.5 years.
For plumbers, underwriters focus first on: water damage from failed fittings, supply lines and water heaters; and mold claims that follow slow leaks. See the full coverage guide for plumbing contractors for limits, endorsements and workers' comp rules.
Asena Capital Insurance Services compares multiple markets for Oakland contractors and requests additional insured endorsements for you when a contract calls for them. Call (858) 925-9555 or request a quote — only your name, phone and email are required. CA License #6008596.
125 active C-36 licenses have a business address in Oakland (CSLB, September 2026); 41% carry workers' comp and 55% are filed exempt.
Yes if you have employees. With no employees you can currently file an exemption; beginning January 1, 2028, CSLB will require workers' comp for all active licenses under SB 1455, except joint ventures.