What Insurance Do Plumbers Need Before Bidding Commercial Jobs?
The insurance paperwork gets reviewed before the price does — a bid with the wrong limits gets rejected before anyone discusses the number.
Commercial plumbing bids need higher limits than most residential shops carry — here's the actual gap
Requirements vary by general contractor and project size — always verify before bidding.
A residential shop and a commercial general contractor are pricing two different kinds of risk. A residential leak damages one homeowner's kitchen; a failed commercial installation can flood multiple tenant units, trigger business-interruption claims from every affected business, and shut down a building. That difference in blast radius is exactly why commercial bids get screened on insurance paperwork before a general contractor even looks at the price.
Commercial requirements don't scale in gradually — a GC's minimums apply in full on the first bid you submit.
What commercial clients typically require
Typical residential vs. commercial requirements
| Coverage | Typical residential | Typical commercial minimum |
|---|---|---|
| General liability | $1M/$2M often sufficient | $1M/$2M per-occurrence/aggregate, verified via COI |
| Workers' compensation | Statutory | Statutory + employer's liability specifically named |
| Commercial auto | Covers service vehicles | Same, but often named as additional insured |
| Umbrella liability | Uncommon | Increasingly required, $1M+ above other limits |
Why the minimums keep climbing
As plumbing companies take on larger commercial and multi-unit residential jobs, the potential damage from a failed job scales with the building, not the job — water intrusion across multiple units, business interruption for every tenant affected. A real umbrella claim example shows the mechanism directly: a multi-vehicle accident produced a judgment above the underlying $1M auto policy limit, and the umbrella policy covered the remaining roughly $650,000. Commercial GCs price their insurance requirements around exactly that kind of tail risk, which is why they ask for higher limits than a residential job ever would.
Getting the paperwork right
Before you submit a commercial bid, confirm
- Your certificate of insurance (COI) lists the exact GL per-occurrence and aggregate limits the RFP specifies — not just "adequate coverage"
- The general contractor or property manager is named as an additional insured, if the contract requires it
- Your workers' comp policy explicitly includes employer's liability at the limit requested
- Umbrella coverage is in place if the job's scale (multi-unit, high-value building) makes a large water-damage judgment plausible
- Your broker can turn around an updated COI within the bid deadline — a slow COI request has cost real bids before
A bid with the right price but the wrong coverage limits gets rejected in the paperwork stage — the general contractor's insurance requirement is usually a hard gate, not a negotiable line item.
Getting the coverage limits right before you bid — not after a GC flags the gap — is what actually gets a plumbing company's foot in the door for commercial work.
Run our free audit to see the essential and recommended policies for a plumbing business your size, plus what each one typically costs.