Plumbing Contractor Insurance: What It Actually Costs and Covers

General liability insurance for a plumbing contractor typically costs $400 to $4,000 a year, scaling directly with revenue and crew size rather than a flat per-plumber rate.

How much does general liability insurance cost for a plumbing contractor?

• Solo plumber, basic policy: roughly $400 to $1,200 a year
• Industry average: around $1,378 a year ($115/month)
• Mid-size residential plumber: median around $2,200 a year
• At $1.5M+ in revenue: general liability alone can run $4,000+ for comparable limits

$1 million per occurrence / $2 million aggregate is the baseline most GCs, municipalities, and property managers require before work begins, and commercial or multi-family jobs frequently push that requirement to $2 million per occurrence.

How common are water damage claims in this trade?

Very. 40% of all water damage claims are caused by pipe bursts specifically, with plumbing leaks, clogged drains, overflowing toilets, adding another 25%. About 1 in 67 insured U.S. homes files a water damage or freezing claim every year, and the average payout exceeds $15,000 per claim. Total water damage claims cost the industry an estimated $13 billion annually, making it the single most expensive, highest-frequency liability category a plumber's work touches.

Does insurance cover sewage backup claims differently than regular water damage?

Yes, and the difference matters. Category 3 "black water" sewage backup is heavily contaminated with pathogens and fecal matter, and restoration costs run $7 to $7.50+ per square foot, well above standard water damage. Standard homeowners coverage often doesn't apply cleanly to sewage backup either, which shifts more of the liability exposure directly onto the plumber's own work and insurance.

What's the risk with gas line connection work?

A single catastrophic gas leak or explosion can exhaust a plumbing contractor's entire general liability limit and expose personal assets beyond it. Carriers increasingly apply XCU (explosion/collapse/underground) exclusions specifically targeting gas piping work, meaning it may not be covered at all unless you've bought back that exclusion through a specific endorsement, worth confirming directly rather than assuming it's included.

What bonding or licensing is typical for plumbers?

State requirements vary widely: California, Ohio, and Minnesota require $25,000 bonds; Illinois $10,000-$25,000; Iowa and Oklahoma $5,000; New Jersey just $3,000. Texas is a notable outlier, it requires no state bond at all, but mandates a certificate showing at least $300,000 in commercial general liability for its Responsible Master Plumber designation, an insurance-based requirement instead of a bond-based one.

See full coverage details for Plumbing Contractor Insurance, or start a free quote to compare your own numbers.