Plumbing business insurance is one of those startup costs nobody gets excited about, right up until a supply line you soldered lets go and floods a finished basement. Water damage claims are exactly why plumbers pay more for coverage than most trades, and why skipping it is the fastest way to lose a business you just built. Here’s what you actually need, what it costs in 2026 with real numbers, and where you can safely save.

The short answer

A solo plumber with a van typically needs three policies to start: general liability (about $75 to $125 a month), commercial auto (about $150 to $225 a month), and whatever license bond your state or city requires (usually cheap). Hire your first employee and workers comp joins the list at roughly $200 a month per plumber. All in, most one-truck shops land between $250 and $450 a month. Budget for it like a truck payment, because it is one.

The policies, one by one

General liability: the non-negotiable one

Covers damage you cause to other people’s property and injuries to non-employees. The flooded basement, the cracked tile from a dropped wrench, the customer who trips over your drain machine. Most plumbing shops pay $75 to $125 a month for a $1M per-occurrence / $2M aggregate policy, which is the standard commercial customers and GCs will ask for. Bigger crews and new-construction work push it higher.

Two reasons to buy it even where it’s not legally required: most states and many cities require proof of it for your license anyway, and you can’t bid commercial work without a certificate of insurance (COI). Landlords and property managers will ask for one before you touch their buildings.

Commercial auto: your personal policy won’t cover the van

The moment your van hauls tools for money, your personal auto policy has an excuse to deny the claim. Commercial auto runs about $150 to $225 a month per vehicle for plumbers. Yes, it stings. A denied $40,000 claim after your apprentice rear-ends someone stings more.

Workers comp: required almost everywhere once you hire

Covers medical bills and lost wages when an employee gets hurt. Plumbing rates are higher than office work for obvious reasons: figure roughly $190 to $210 a month per employee, billed as a rate per $100 of payroll. Most states require it at your first hire (a few at three or four employees). Going “1099 only” to dodge it is a classic new-shop move that ends badly in an audit; if you control their schedule and tools, they’re probably employees.

License and permit bonds: cheap, often mandatory

Many states and cities require a surety bond ($5,000 to $25,000 face value) to issue or renew a plumbing license. You don’t pay the face value, just a premium, typically under a couple hundred dollars a year. Check your state’s rules when you apply for your license, and price it into your plumbing startup budget.

Tools and equipment: the cheap add-on worth taking

An inland marine / contractor’s tools floater covers your gear in the van and on job sites, average around $19 a month. One stolen drain camera pays for a decade of it.

Worth considering as you grow

• BOP (business owner’s policy): bundles general liability with commercial property coverage, usually cheaper than buying separately once you have a shop.
• Umbrella: adds $1M+ on top of your other policies. Some commercial contracts require $2M+ total, and this is the cheap way to get there.
• Professional liability: if you do design-build or spec work where advice, not just workmanship, can cause a loss.

What a one-truck shop really pays (2026)

• General liability: $75–$125/mo
• Commercial auto (1 van): $150–$225/mo
• Tools & equipment: $15–$25/mo
• License bond: $8–$15/mo equivalent
• Workers comp (first employee): +$190–$210/mo

Solo total: roughly $250–$390/mo. With one employee: $450–$600/mo. Those figures line up with what insurers like NEXT, Insureon, and industry cost surveys report for small plumbing businesses in 2026. Your quotes will vary with location (New York and California run hot), claims history, payroll, and how much new-construction vs. service work you do.

Building your full launch budget? Our free startup cost calculator has an insurance line built in, so you can see how coverage fits next to the van, tools, and licensing.

What moves your rate up or down

• Work mix. Service and repair is cheaper to insure than new construction or fire-suppression work.
• Payroll and revenue. Both GL and workers comp scale with size. Underreporting triggers back-billing at audit, so estimate honestly.
• Claims history. One water-damage claim can follow you for three to five years. Photograph your work, use pans and pressure tests, and document everything.
• Deductible. Raising GL from $500 to $2,500 can trim the premium meaningfully if you have cash reserves.
• Location. Same shop can pay 30% more across a state line. Nothing you can do but know it.

How to buy it without overpaying

Get at least three quotes: one from an online insurer built for trades (fast, often cheapest for solo shops), one from an independent agent who writes a lot of contractors (better once you have employees), and one from wherever your auto policy lives, since bundling helps. Ask each for the same limits ($1M/$2M GL) so you’re comparing straight across. Then ask two questions that separate good policies from cheap ones: “Is water damage from my completed work covered?” (completed operations) and “What’s excluded?” Read the exclusions page. It’s one page. Read it.

Pay annually if you can, it’s usually 5 to 10% cheaper than monthly. And set a calendar reminder to re-shop every two years; loyalty is not rewarded in commercial insurance.

Proof of insurance wins you work

This is the part nobody tells new plumbers: insurance isn’t just protection, it’s marketing. “Licensed, bonded, and insured” on your website, estimates, and van converts customers who are scared of hiring the cheap guy. Property managers won’t even call you back without a COI on file. The $100 a month you’re hesitating over is the ticket into the commercial work that pays for it ten times over. It belongs in your launch plan from day one, right alongside the steps in our guide on how to start a plumbing business.

Quick FAQ

Can I start with just general liability? If you’re solo and your state doesn’t require more for licensing, yes, GL plus commercial auto is the realistic minimum. Add the tools floater the day your gear is worth more than a month of coverage.

Is “bonded” the same as insured? No. A bond protects the customer (and the state) if you fail to do the job right or follow license rules. Insurance protects you when accidents happen. Most plumbers need both.

Do I need insurance before I get my license? In many states, yes, you’ll submit a COI and bond with your license application. Check your state board’s checklist before you buy anything.

What limits do commercial clients want? $1M per occurrence is the floor. Larger property groups often ask for $2M aggregate and to be named as additional insured, which your insurer will do for free or a small fee.