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Plumbing insurance: the coverage a small plumbing business needs, and what it costs
Most small plumbing shops need general liability, commercial auto and tools coverage from day one, workers' comp when they hire, and often a bond for the license. Here's what each one covers, published average costs from two insurers, and three states' rules.
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This is general information, not insurance or legal advice. Policies differ in what they cover and exclude, and every state sets its own rules. Read your policy, talk to a licensed insurance agent, and check your license board's current requirements before you buy or renew.
Plumbing work happens inside people's homes, around water, gas and fire. A small mistake can soak a finished basement, and a slip on a customer's stairs can end a season. Insurance is what keeps one bad day from ending the business. In many states it's also a condition of your license.
This guide covers the policies a one- or two-truck residential shop usually carries, how bonds differ from insurance, what drives the price, and what two insurers publish as typical costs for plumbers.
The coverage at a glance
| Coverage | What it's for | When you need it |
|---|---|---|
| General liability | Injury to other people and damage to their property caused by your business | Day one; often required for the license |
| Commercial auto | Accidents in the vehicle you use for work | Day one, if you drive to jobs |
| Tools and equipment (inland marine) | Theft or damage to your tools, on the truck or on the job | Day one, for most shops |
| Workers' compensation | Medical bills and lost wages for employees hurt on the job | When you hire, and sooner in some states |
| Professional liability (errors and omissions) | Claims that your advice, design or recommendation caused a loss | If you design systems or give paid advice; some programs ask for it |
| Commercial umbrella | Extra limits on top of liability and auto | When contracts require higher limits, or as you grow |
| Surety bond | Protects customers and the state if you don't meet your obligations | Where your license or permits require one |
General liability
This is the policy customers, general contractors and license boards ask about. It covers claims that your business injured someone or damaged their property: a homeowner trips over your hose, a torch scorches a cabinet, a fitting you installed lets go and floods the floor below.
Insureon says its typical plumber policy has limits of $1 million per occurrence and $2 million aggregate. Some licenses set a minimum (see the state examples below). Questions worth asking the agent:
- How does the policy handle damage that shows up after you've left the job (completed operations)?
- Are there exclusions for water damage, mold, or particular kinds of work you do?
- Can you add customers or general contractors as additional insureds when a contract asks for it?
Some insurers bundle general liability with commercial property coverage in a business owner's policy (BOP). That makes sense if you have a shop or warehouse; a home-based shop may not need the property part.
Commercial auto
Your truck is where most of your risk sits: you drive every day, often with a full load. Many personal auto policies limit or exclude business use, so ask your agent directly whether your current policy covers the way you'll use the vehicle. Tell the insurer about every driver.
Tools and equipment
General liability covers damage to other people's property, not your own. Tools and equipment coverage (often written as inland marine) covers your tools and equipment when they're stolen or damaged, including away from your shop. Check whether it covers theft from an unattended vehicle overnight, what proof the insurer wants, and whether it pays replacement cost or depreciated value. Keep a list of your tools with photos and serial numbers.
Workers' compensation
Workers' comp pays medical care and lost wages when an employee is hurt at work. Every state has its own law, and the rules for owners and sole proprietors vary. Two examples:
- California: the CSLB says state law requires employers, including construction employers, to carry workers' comp "even if they have only one employee". A licensee with no employees can file an exemption, unless the license has a Responsible Managing Employee or is in a classification that must always carry it. That list is C-8 Concrete, C-20 HVAC, C-22 Asbestos Abatement, C-39 Roofing and C-61/D-49 Tree Service; the C-36 Plumbing license isn't on it. A 2024 law, SB 1455, moved a planned requirement for all licensees to January 1, 2028, according to CSLB board materials. Check CSLB's page before you renew, since this rule has already changed once.
- Washington: L&I says the state "does not allow private workers' compensation coverage". You buy it from L&I, or qualify as a certified self-insured employer.
Treat helpers and subcontractors carefully. Whether someone counts as your employee for workers' comp is a legal question your state answers, not the label on the paycheck.
Professional liability and umbrella
Professional liability (errors and omissions) covers claims that your advice or design caused a financial loss, which general liability may not cover. For a pure service shop it's often optional. It becomes relevant if you design systems, size equipment for others, or do paid consulting. It can also be a requirement: Google lists professional liability insurance, along with general liability, among its verification requirements for US plumbers who advertise on Local Services Ads.
A commercial umbrella policy adds limits above your liability and auto policies. Property managers, builders and commercial clients sometimes require higher limits than a basic policy carries; an umbrella is usually the cheaper way to meet them.
Surety bonds are not insurance
A license bond protects your customers and the state, not you. If a claim is paid against your bond, the surety usually expects you to pay it back. Insurance protects your business; a bond guarantees you'll follow the rules and meet your obligations.
Bond requirements come from your license board, and sometimes from the city or county where you pull permits. California requires a $25,000 contractor bond, an amount that took effect January 1, 2023. Washington requires a $6,000 plumbing contractor surety bond.
State requirement examples
| State | Insurance | Bond and other |
|---|---|---|
| Texas (TSBPE, Responsible Master Plumber) | Proof of at least $300,000 of commercial liability insurance, kept in force, with a Certificate of Insurance signed by your agent | RMP initial application fee: $225 |
| California (CSLB) | Workers' comp if you have any employees, or a filed exemption if you have none and qualify | $25,000 contractor bond |
| Washington (L&I, plumbing contractor) | $200,000 public liability and $50,000 property damage, or $250,000 combined single limit; workers' comp only through L&I or self-insurance | $6,000 plumbing contractor surety bond |
These are minimums for the license, not a recommendation for how much coverage to carry. If you work in a city with its own plumbing license, check its rules too. Our guide to starting a plumbing business covers the license steps that come before insurance.
What drives the cost
Insureon and NEXT both list similar factors. Expect your quote to depend on:
- The work you do: service and repair, new construction, gas, sewer and excavation carry different risks.
- Residential or commercial work, and where you work.
- Employees and payroll, and how each worker is classified. Payroll drives workers' comp.
- Annual revenue and business size.
- Vehicles and drivers, for commercial auto.
- The value of your tools and equipment.
- Your experience and claims history.
- Limits and deductibles you choose.
What plumbers pay: published figures
Two insurance companies publish cost figures for plumbers on their own websites. They're based on each company's own customers or applicants, measured differently, so treat them as rough reference points, not quotes.
| Policy | Insureon, median per month | NEXT, per month |
|---|---|---|
| General liability | $147 | $75 on average for 94% of its customers; range $55 to $328 |
| Business owner's policy | $213 | — |
| Workers' compensation | $179 | $209 median |
| Commercial auto | $285 | — |
| Tools and equipment | $42 | $32 on average for 35% of its customers; range $32 to $66 |
| Professional liability | $67 | — |
| Commercial umbrella | $93 | — |
| Commercial property | — | $32 to $63 for 51% of its customers |
| Surety bonds | $8 | — |
Insureon: median cost of policies for plumbing contractors who apply for quotes with Insureon, for businesses with fewer than five employees, annual revenue from about $50,000 to more than $200,000, and five years or less in business; page updated August 5, 2026. NEXT: figures from its active customers over the previous 12 months; page dated October 2026. NEXT's headline "as little as $75 per month" is, per its footnote, the general liability minimum premium for plumbing businesses in Texas.
The gap between the two general liability figures is a good reminder of why you get several quotes. Put the insurance total in your overhead before you set your rates. A one-page plumbing business plan is a good place to write it down.
Insurance is overhead, and overhead belongs in every price. Plumbo, now on the App Store and Google Play, builds each quote from your own price book, with your business name, license number and terms on it. Try the 60-second demo →
How to buy and keep it straight
- Start with what your license requires. Get the board's minimums in writing, and the exact wording it wants on the certificate.
- Get at least three quotes for the same limits and deductibles, from an independent agent, a direct insurer or an online marketplace.
- Match the names. The name on your license, insurance, bond and bank account should line up.
- Keep certificates handy. Customers, general contractors and property managers will ask for a certificate of insurance. Keep a current PDF on your phone.
- Set renewal reminders. A lapsed policy can put your license at risk where insurance is a license condition.
- Review once a year, and whenever you hire, buy a truck or add a new kind of work.
The short version
Carry general liability, commercial auto and tools coverage from day one. Add workers' comp when you hire, or sooner if your state requires it. Get the bond your license or permits call for. Add professional liability and an umbrella when your work or your contracts need them. Check your state's minimums, get several quotes, and build the cost into your prices.
Sources
- Texas State Board of Plumbing Examiners, Responsible Master Plumber ($300,000 commercial liability insurance, Certificate of Insurance, $225 initial fee), checked October 7, 2026.
- Contractors State License Board, Workers' compensation requirements (employers, exemptions, classifications that must carry it), checked October 7, 2026.
- Contractors State License Board, Bond requirements ($25,000 since January 1, 2023), checked October 7, 2026.
- Contractors State License Board, Senate Bill 1455 board packet item (PDF: all-licensee workers' comp requirement moved from 2026 to 2028), checked October 7, 2026.
- Washington State Department of Labor & Industries, Plumbing contractor licensing requirements (bond and liability insurance), checked October 7, 2026.
- Washington State Department of Labor & Industries, Do I need a workers' comp account? (no private workers' comp coverage), checked October 7, 2026.
- Insureon, Plumbing business insurance cost (median costs, method, typical limits, cost factors; updated August 5, 2026), checked October 7, 2026.
- NEXT Insurance, Plumber insurance cost (customer cost data, cost factors; dated October 2026), checked October 7, 2026.
- Google Local Services Help, Business screening and verification requirements, United States (plumber insurance requirements), checked October 7, 2026.