Plumbing contractors in San Jose by the numbers
San Jose is home to 375 licensed plumbing contractors (C-36, CSLB September 2026) — #4 in California, about 8% of the 4,970 contractor licenses based here.
Nearby in Santa Clara County: Santa Clara (47), Gilroy (46), Sunnyvale (33), Campbell (27).
36% of San Jose's C-36 licensees hold more than one classification — most often B General Building Contractor (25%), C-10 Electrical Contractor (15%). Extra classifications can change how carriers rate your general liability and workers' comp, so list every license class when you quote.
Business structure: 44% sole owners, 50% corporations, 6% LLCs; median time licensed 10.1 years.
What carriers look at
For plumbers, underwriters focus first on: service vans with tools, parts and drain equipment; and water damage from failed fittings, supply lines and water heaters. See the full coverage guide for plumbing contractors for limits, endorsements and workers' comp rules.
Get a quote
Asena Capital Insurance Services compares multiple markets for San Jose 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.
Frequently asked questions
How many licensed plumbing contractors are in San Jose?
375 active C-36 licenses have a business address in San Jose (CSLB, September 2026); 52% carry workers' comp and 45% are filed exempt.
Do C-36 plumbers need workers' comp?
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.