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Plumber Insurance · C-36

Plumber insurance built around water damage.

General liability, workers' compensation, tools, commercial auto and license bonds for California plumbing contractors, from service calls to new construction.

By Sam Alishahi · CA Insurance License #4348151 · Reviewed November 2026 · En español · How this page is researched

Get a Quote Call (877) 711-4545

How it works

One leak can become a large claim

A failed fitting behind a wall can soak floors, cabinets and the unit below before anyone notices. Water damage is the claim plumbers see most, and carriers price and restrict coverage around it.

I match your plumbing business to carriers that fit the work you do, whether residential service, repiping, new construction or commercial, and set up workers' comp for your crew now and for the January 1, 2028 requirement.

General liabilityWater damage and injuries caused by your work, including completed jobs.
Workers' compRequired for employees now, and for all licensed contractors from January 1, 2028.
Tools and equipmentTools, cameras, jetters and parts on the truck.
Commercial autoService trucks and vans.

What I help with

Plumbing situations I'm called for

Water damage exclusions

Checking that your policy doesn't exclude the claims you're most likely to have.

Property manager needs a COI

Certificates with additional insured wording. See details

Hiring a helper

Workers' comp with the right class code. See details

Expensive equipment

Coverage for cameras, jetters and tools. See details

Fleet of service trucks

Commercial auto for vans and drivers. See details

License bond

CSLB contractor license bonds. See details

Before you call

What underwriters will ask

Having these ready means I can go to market on the first call. The quote form asks for the same things, and anything you don’t know yet can wait.

Start the Quote Form

License: CSLB number and classifications.
Work: service and repair, repipes, new construction or commercial.
Payroll: employees, payroll and subcontractor costs.
Revenue: annual gross receipts.
Vehicles and equipment: trucks and equipment value.
History: current policies and loss runs.

What CSLB asks of a C-36 plumber

CSLB requires two things on file with your license: a contractor bond, and either a workers' comp certificate or an exemption. Both belong in the insurance conversation, because a gap in either one reaches the license.

Contractor bond: $25,000 since January 1, 2023, under Senate Bill 607. If the license is qualified by a responsible managing employee, a $25,000 bond of qualifying individual is also required. See contractor license bonds.
Workers' comp on file: CSLB accepts a certificate of workers' comp insurance, a Department of Industrial Relations certification of self-insurance, or a signed exemption. C-36 is not one of the classes barred from the exemption (C-8, C-20, C-22, C-39 and C-61/D-49), but no exemption is allowed if the license is qualified by a responsible managing employee.
Hiring ends the exemption: once you hire, the exemption on file is no longer valid, and CSLB must receive proof of coverage within 90 days of the hire. Failing to maintain coverage results in suspension, and work done while suspended is considered unlicensed. See workers' comp with no employees.
January 1, 2028: SB 1455 (Chapter 485, Statutes of 2024) set that date for the requirement that all licensees hold workers' comp, and directed CSLB to set up a process for verifying who is eligible for an exemption. Check where your license lands with the 2028 check.

Other states set their own bond, workers' comp and plumbing license rules, and they vary by state, so tell me where you work before we build anything.

How a liability policy reads a leak claim

When a joint you made fails, the standard ISO general liability form splits the loss between your work and everything around it. IRMI's analysis of faulty-work claims walks through the exclusions that do the splitting:

Exclusion j.(5): damage to that particular part of real property on which you or your subcontractors are working, if the damage arises out of those operations.
Exclusion j.(6): that particular part of any property that must be restored, repaired or replaced because your work was incorrectly performed on it.
Exclusion l., damage to your work: applies to completed work, except when the damaged work or the work causing the damage was performed for you by a subcontractor. IRMI notes that endorsements CG 22 94 and CG 22 95 can remove that exception, which matters if you sub out any part of the job.

IRMI's example is a contractor who snaps a sprinkler pipe with the wrong tool: damage to the snapped pipe is excluded, while IRMI concludes property damage coverage would apply to the portions of the building damaged by the water. Redoing your own fitting is on you; the damage around it is what the policy is designed to look at.

Once the job is done, claims move into the products-completed operations hazard. Work counts as completed at the earliest of three points: all work your contract calls for is finished; all work at one job site is finished, when the contract covers more than one site; or that part of the work is put to its intended use by someone other than another contractor or subcontractor. Those claims count against the products-completed operations aggregate, one of the CGL's six limits, so read that number on your declarations, not just the per-occurrence limit.

Last, look for a fungi or bacteria exclusion on the schedule of forms. IRMI describes ISO's version as expressly excluding mold cleanup and remediation costs and injury; ISO also has a limited fungi or bacteria coverage endorsement with a separate aggregate limit. More on the base policy at general liability.

What GCs and property managers write into your contract

The insurance exhibit in a subcontract or a property manager's vendor agreement usually asks for three separate things. Each is its own endorsement, and each has to match the contract wording.

Additional insured, ongoing operations: ISO's CG 20 10 has been limited to your ongoing operations since its 1993 revision, and since 2004 it applies to injury or damage caused in whole or in part by your acts or omissions or those of people acting on your behalf. See additional insured on a contractor policy.
Additional insured, completed operations: CG 20 37, introduced with ISO's 2001 revisions, is the separate form for claims arising from your work after it is finished, which matters for a leak that shows up after you leave.
Waiver of subrogation: CG 24 04 waives your insurer's right to recover from the party named in its schedule; you keep your own rights. IRMI notes it does not make your coverage primary and noncontributory, which is a separate request. Contracts pair it with AI status because CG 20 10 excludes completed operations, so without the waiver your insurer could pursue the GC on a post-completion claim. See waiver of subrogation.

Two more details to check. ISO's 2013 AI endorsements give the additional insured no broader coverage than the contract requires, and the limit is the lesser of the contract amount and the limits on your declarations. IRMI also names California among the states that prohibit additional insureds from receiving greater coverage than they could obtain by indemnification. Send me the exhibit before you sign and I will check it against what your policy can actually issue. The difference between a name on a certificate and real AI status is covered in certificate holder vs. additional insured.

The van, the tools, and the auto gap

Your general liability policy is not built for the service van. The NAIC's small business guide says standard commercial general liability does not cover claims related to operating a vehicle, and that you need separate commercial vehicle coverage for accident claims. Three points from the same guide matter for plumbing shops:

Whose name is on it: if the business owns or leases the van, its name should be on the policy as the principal insured.
Personal policy on a work vehicle: when you rely on personal coverage for business driving, business-related liability may be excluded.
Helpers in their own cars: commercial policies may extend to rented and other non-owned vehicles, including employees' cars driven for company business. That is the one to ask about if a helper drives to the supply house.

The NAIC guide also suggests more coverage for permanently attached items such as a generator or storage unit. For an upfitted van with shelving, a mounted jetter and a parts inventory, list what is bolted to the vehicle separately from the tools that come out of it, so each item is placed on the right policy. See commercial auto and tools and equipment for California contractors.

Questions

Plumber insurance, answered

Does general liability cover water damage caused by a plumber?

It can cover damage to a customer's property caused by your work, but some policies limit or exclude certain water damage. The policy wording matters, so it's worth checking before a claim.

Do plumbers need workers' comp in California?

Yes if you have employees. Starting January 1, 2028, all CSLB-licensed contractors must carry workers' compensation, with limited exceptions.

Are my tools covered by general liability?

No. Tools and equipment need their own coverage, usually an inland marine or contractor's equipment policy.

What do property managers require from plumbers?

Usually proof of general liability, often $1 million per occurrence, with the property owner and manager named as additional insureds, plus workers' comp if you have employees.

Can a handyman do small plumbing jobs without a license in California?

Since January 1, 2025, AB 2622 has set the minor work exemption at $1,000, but only if the work needs no permit of any kind and the unlicensed person employs no one on the project. CSLB says an unlicensed person who bids over $1,000, performs work requiring a permit, or employs any workers is subject to legal action.

Do you offer plumber insurance outside California?

Yes. Clients across the country send the same quote form. Sam Alishahi is licensed in all 50 states and Washington, DC and places policies there directly. The shopping across carriers works the same way. Rules, minimums and markets differ by state — see insurance requirements by state.

Official sources

Often placed alongside this

Coverage

Contractor insurance

Workers’ comp and liability that clear the contract.

See coverage Coverage

HVAC contractor insurance

Workers' comp, liability and bonds for C-20 HVAC contractors.

See coverage Coverage

Pollution liability insurance

Contractors pollution and site pollution coverage, including mold and asbestos.

See coverage Tool

2028 contractor workers’ comp check

Six questions and the rule that applies to your license.

Use the tool

Questions people ask: What is additional insured on a contractor policy? Do subcontractors need their own insurance in California? What is a certificate of insurance? Tools and equipment insurance for contractors

Also covered with this: Fire sprinkler contractor insurance Irrigation contractor insurance Septic contractor insurance Underground utility contractor insurance Water treatment dealer insurance

By state: Insurance requirements by state

CSLB’s license file lists 18,244 active California licenses with the C-36 Plumbing classification. 9,313 of them (51%) list a workers’ comp exemption, and the requirement extends to all contractors on January 1, 2028. Workers’ comp by trade and county.

Plumber insurance

Send your license number. I'll shop it.

Your CSLB number, the work you do and your revenue are enough to start.

Get a Quote Call (877) 711-4545

Alishahi Insurance · Saman Alishahi, independent insurance broker, California License #4348151. General information, not a quote or a promise of coverage; coverage depends on underwriting and the terms, conditions and exclusions of the policy actually issued.

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