California Plumbing Contractor Insurance: The C-36 Rules Everyone Gets Wrong
We insure plumbing contractors in California, and right now more bad information circulates about C-36 requirements than almost any other contractor topic we write. The universal workers compensation mandate did not land in 2026. SB 1455 moved the all-licensee requirement to January 1, 2028. LLC shops still face a $1 million liability floor and a $100,000 employee bond that sole props escape. The $25,000 license bond is not general liability. Below we cover the moved deadline, the LLC trap, and what to fix before 2028.
The workers comp deadline that moved
You’ve probably heard that every California contractor needs workers compensation in 2026, employees or not. That was the original plan under Senate Bill 216, which set a universal mandate for January 1, 2026. But a follow-up bill, SB 1455, pushed the all-licensee requirement to January 1, 2028. A new CSLB exemption verification process arrives in 2027. The early phase that already requires comp with zero employees never touched plumbers. It applied only to concrete, HVAC, asbestos, and tree service classes. C-36 plumbers were never on that list. So today the rule is what it’s always been: comp is required once you have an employee. But the 2028 date is real, so owner-only shops should start pricing ghost policies now instead of panicking later.
The LLC trap
Here’s the C-36 detail that actually bites people. Every California contractor posts the standard $25,000 license bond. But if your business is an LLC, the state stacks on two more requirements. You need a $100,000 employee bond, plus mandatory general liability at $1 million per occurrence. Required limits climb as you add employees. Sole proprietors and corporations face no liability insurance mandate at all. Your entity choice literally changes your legal insurance requirements. Plenty of plumbers formed LLCs on their accountant’s advice without anyone mentioning it.
What C-36 shops should do before 2028
The delay is breathing room, not a pass. When the all-licensee mandate lands, owner-only shops will satisfy it with a ghost policy, a workers comp policy written on zero payroll. Ghost policies carry minimum premiums that vary widely by carrier, and the contractors who wait until the deadline will shop in the worst market. Price one early, and if you sub for GCs, expect them to require comp long before the state does. Contracts have been ahead of the statute on this for years.
The entity question deserves a real conversation with both your CPA and your agent in the same week. An LLC brings the $1 million liability mandate and the extra bond, but plenty of plumbers should carry those limits anyway, because a flooded custom home doesn’t care what entity you formed. The mistake isn’t choosing an LLC. It’s choosing one without pricing its insurance consequences first.
The legal minimums are only the floor. Our full plumbing contractor insurance guide covers the claims that hurt plumbers most. They involve the “your work” exclusion and pollution denials on sewage claims. No state mandate addresses either one.
Quick answers for California plumbers
Do I need workers comp as a solo C-36 right now?
Not by statute, if you truly have no employees. You will need it for most GC contracts, and every licensee needs it by January 1, 2028. Price a ghost policy before the deadline crowd does.
Is the $25,000 bond the same as insurance?
No. The bond protects consumers, and the surety collects from you after paying a claim. Insurance transfers risk off your balance sheet. Contracts asking for licensed, bonded, and insured mean all three.
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