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General Liability: Your Jobsites Require It
For most C-36 licensees, general liability is a contract requirement rather than a license requirement. The state doesn’t require it — your GCs, property managers, and permit offices do. And behind the paperwork sits the exposure that actually writes the checks in plumbing: water, in a building, where it was never supposed to be.
The State Doesn’t Require It. Your Contracts Do.
Two different authorities decide what a plumbing contractor carries: the CSLB decides what keeps your license active, and your contracts decide what gets you on the job. GL sits almost entirely on the contract side.
If you hold your C-36 as a sole proprietor, a partnership, or a corporation, general liability is not part of what the CSLB requires to keep your license active. You can renew without it. The state doesn’t require it — your GCs, property managers, and permit offices do.
That’s the rule that actually governs your calendar. General contractors, property management companies, service and home-warranty networks, and commercial building owners want a certificate of insurance — usually naming them as additional insured — before a plumber gets scheduled. No certificate on file, no work order. Contract rules are enforced faster than statutes, and they are enforced by whoever is holding the job you wanted.
There is one entity type where GL is the law. If your license is held by an LLC, § 7071.19 requires it, and the amount scales with headcount: $1,000,000 aggregate for a company of five or fewer persons, plus an additional $100,000 for each person beyond the fifth, capped at $5,000,000 in any one designated period. That sits on top of the $100,000 LLC employee/worker bond. The full LLC rules are on the LLC bond page.
| Sole proprietor | Not a CSLB requirement. Required by contract on most GC, property-manager, and commercial work before the first fitting goes in. |
|---|---|
| Partnership | Not a CSLB requirement. Same jobsite reality — the certificate is what gets you on the schedule. |
| Corporation | Not a CSLB requirement. GCs, property managers, and commercial owners still want a current certificate on file. |
| LLC | Required by statute: $1,000,000 aggregate, plus $100,000 for each person beyond the fifth, to a $5,000,000 cap — in addition to the $100,000 LLC employee/worker bond. |
So the practical question isn’t “does the state make me carry GL?” It’s “can I take the work I want without a certificate?” For homeowner-direct service calls, sometimes. For GC, property-management, and commercial work, almost never.
Water Doesn’t Stay Where You Left It
Plumbing liability is not mostly about someone tripping over your toolbag. It’s about what a small failure does to the building around it — sometimes long after you drove away.
The Claim Is the Building, Not the Part
A supply line behind a finished wall is a fitting worth a few dollars. When it lets go, the claim is drywall, flooring, cabinetry, and everything the water reached on the way down. Plumbing losses are almost never sized like the job that caused them.
Completed Operations Is the Long Tail
The premises side of a liability policy speaks to the day you were on site. Completed operations speaks to the work after you left — and a fitting picks its own moment to fail. Ask what your completed-operations coverage looks like, not just the per-occurrence limit.
Slab and Underground Change the Math
Work under a slab or in the ground carries its own question on every application, and for a plain reason: reaching the failure means opening a floor or a yard. The repair to the structure can dwarf the repair to the pipe.
The Limit Is Set by Whoever Hired You
Your GC’s contract, not your judgment, usually sets the limit and the additional-insured wording you need. Send us the insurance requirements page and we work backwards from what it actually demands, instead of guessing at a round number.
What a Plumbing Submission Turns On
Four things shape how a plumbing GL submission gets read. Clear answers on each make you a better risk on paper — which is the only version of you an underwriter ever meets.
- Work mix — service, repipe, new construction. A drain-and-service operation and a repipe or tract-plumbing operation are different risks with different claim patterns. Know your split in real percentages, not “mostly houses,” before the application asks.
- Slab, underground, and trench work. Whether you go under slabs or into the ground, and how much of your year that is. It is one of the first questions on a plumbing application, and a vague answer has never helped anyone.
- Hot work. Soldering, brazing, and anything with an open flame in a wall cavity is a fire question sitting inside a water trade. Be precise about what you torch, where, and your fire-watch practice.
- Subcontractors — and their certificates. Whether you sub work out, how much, and whether every sub hands you a current certificate of insurance of their own. It moves the risk directly, so it moves the submission.
The classic trap: uninsured subs. When a subcontractor without their own coverage causes a loss, the claim can land on your policy — and on your claims record, where it follows you for years. Collect a current certificate from every sub before they open a wall. It’s the same discipline your GC applies to you, for exactly the same reason.
Aster places general liability for California plumbing contractors — we’re an independent brokerage, so the carrier bears the risk and we do the placing. Bring the contract that’s asking for the certificate and we’ll start there.
Your Jobsites Want a Certificate. Start With the Honest Number.
The Rate Check computes a market benchmark for a plumbing company your size in the page, before any form asks who you are. If you’re at or under market, we’ll tell you to stay put.
This is a market benchmark, not a quote or offer of insurance — actual premiums are determined by carriers upon application. Aster National Insurance Group · CA Lic #0N10039.