How to start a plumbing business: licenses, insurance and bonds

Why the order matters when starting a plumbing business

Most guides on how to start a plumbing business spend pages on logos and marketing. The part that stalls new shops is the paperwork order. In many states, the license board wants your legal name, proof of insurance and a bond on file first. Only then does it issue the license.

Get the order wrong and you buy a policy twice or wait weeks for a license. This guide walks through the license, insurance and bond steps in the order a board sees them, with what each one usually costs.

What to line up before you start

• A license holder. Most contractor licenses rest on one person with a master-level license, not a journeyman card. In Minnesota, that person must hold an active master plumber license and be an owner, officer or W-2 employee working in the company.
• Your legal business name. Pick it, confirm with your secretary of state that it's available, and stick with it.
• Clean credit. Surety companies often price license bonds on the owner's credit.
• A rough plan for payroll and vans. Insurers usually price comp on payroll and auto on your vehicles and drivers.

Step 1: Form the business entity first

Form your LLC or corporation before you buy a single policy. Insurance certificates and bonds are issued to a named business. If that name doesn't match your license application, the board can send it back.

Minnesota spells this out. Its rules say the name on your insurance certificate must match your Secretary of State filing exactly.

Florida's rule says the same thing: the insured name on the certificate must match the exact name of the business being licensed.

An LLC or corporation can help keep business debts apart from your house and savings. A sole proprietorship usually doesn't. Which business structure fits is a question for your CPA or attorney, not your insurance agent. Still, the choice can change your insurance bill.

California is the clearest case. An LLC license there needs liability insurance with at least a $1 million limit when five or fewer people are on the license. It also files a $100,000 worker bond on top of the standard $25,000 contractor bond. Those two items apply only to LLC licenses.

Next, get your Employer Identification Number (EIN) from the IRS. The IRS doesn't charge for an EIN, so skip any site that does.

You can apply for an EIN on the IRS website. You'll use it for payroll, your business bank account and most insurance applications.

Step 2: Get the plumbing contractor license

Your plumbing business license comes from one of two places: a state board, or your city or county. Look up the right office before you buy anything. Its rules set your minimum insurance limits and your bond amount.

Four state examples

• Texas. Each shop names a master plumber as its Responsible Master Plumber (RMP). The state plumbing board (TSBPE) says the RMP must carry at least $300,000 of liability coverage. More on Texas plumber insurance.
• Minnesota. The contractor license calls for a $25,000 bond, proof of liability and comp coverage, and a $188 fee. You need it for contracted plumbing work in towns over 5,000 people. See Minnesota plumber insurance.
• California. Plumbing contractors hold the C-36 license from the Contractors State License Board (CSLB). Every licensee files a $25,000 contractor bond, the amount in force since January 1, 2023. See California plumber insurance.
• Florida. Plumbing contractors must sign a statement that they carry at least $100,000 of public liability and $25,000 of property damage coverage. Some online guides quote $300,000 for plumbers. That figure is for general and building contractors. See Florida plumber insurance.

Step 3: Buy general liability before the license is issued

General liability (GL) may pay when your work hurts someone or damages their property, depending on your policy wording. For many plumbing boards, it's a license condition, not an add-on.

That's why GL comes before the license is final. Texas law says a master plumber must give the board a certificate of insurance before working as an RMP.

Minnesota won't approve a license until it has your liability details, and it wants its Department of Labor and Industry named as certificate holder. Read the Minnesota DLI licensing basics for the full list.

Minnesota asks for one more thing: the policy must include completed operations. That covers damage that shows up after you've finished the job, like a supply line that lets go behind a vanity three weeks after trim-out.

State minimums are floors. Most GCs and property managers ask for more. The published median plumbing GL policy has a $1 million limit per occurrence and $2 million per year.

Our general liability guide for plumbers covers limits and common exclusions.

Example scenario: A new owner buys GL in his own name while the LLC filing is still pending. The board rejects the certificate because the insured name doesn't match the license application. The agent reissues the policy in the LLC's name, and the license sits for two more weeks.

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Step 4: File the license bond

A contractor license bond is a promise to the state, backed by a surety company, that you'll follow licensing law. It protects the public, not you.

In California, the bond covers customers hurt by bad work or license-law violations. It also covers workers owed back pay.

If the surety pays a claim, you're expected to pay it back. That's the big gap between a bond and insurance.

You don't pay the full bond amount. You pay a yearly premium, figured as a percentage of the bond. SuretyBonds.com reports that many contractors pay 1.5% to 3%, and owners with strong credit can pay as little as 1%.

On a $25,000 bond, 1% to 3% works out to $250 to $750 a year. The published median plumbing surety bond costs about $100 a year.

Bond amounts vary by state and city. See plumbing contractor license bonds for how underwriting works.

Step 5: Insure the van with commercial auto

The Insurance Information Institute puts it plainly. A van owned by the business has no coverage under a personal auto policy. A car used mostly for work likely doesn't either.

So once you title the van to the LLC, you'll need a business auto policy. If you or a tech drive a personal car to the supply house or a bid walk, ask about hired and non-owned auto (HNOA). It's built for vehicles the business uses but doesn't own.

Read more on commercial auto insurance for plumbers.

Step 6: Add workers' comp at your first hire

Workers' comp usually pays medical bills and lost wages when an employee is hurt on the job. Whether you need it on day one depends on your state and how your business is set up.

• California: every employer with even one employee must carry it.
• Florida: construction employers with one or more employees must carry it. Owners who are corporate officers or LLC members count toward that total, though owners who qualify can opt out with an exemption.
• Texas: most private employers can choose not to carry it. Those without it must report that to the state.
• Minnesota: proof of comp compliance is part of the plumbing contractor license file.

Set up the policy before your first helper starts, not after. If you plan to pay helpers as 1099 subs, ask a CPA or attorney about worker classification first. Our workers' comp page for plumbers explains how payroll drives the premium.

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Step 7: Cover your tools

A press tool, a sewer camera and a jetter can add up to more than the van is worth. Tools coverage is often sold as an inland marine policy. It's typically built to cover gear you carry to jobs and gear in transit.

An auto policy usually covers the vehicle, not the tools inside it.

Ask how your policy handles theft from a parked van, since the wording varies by carrier. See tools and equipment insurance for what to check.

Step 8: Get COIs ready for your first GC

Your first general contractor job will come with a request for a certificate of insurance (COI). A COI is a one-page summary of your policies, usually on the ACORD 25 form. It's proof, not coverage. The form itself says it gives the holder no rights.

GCs often ask to be named as an additional insured, which can extend parts of your GL to them for your work. That takes an endorsement on the policy, not just a line on the certificate.

Many GCs also ask for a waiver of subrogation. Ask your agent for both before the job starts, so paperwork doesn't hold up your first draw. Our guide to COIs, additional insured and waivers walks through each request.

What insurance costs when starting a plumbing business

One large online insurance marketplace publishes median costs for plumbing contractors who buy through it. Your price depends on payroll, revenue, claims history, the work you do and the limits you choose.

Build these into your startup costs from day one. A one-truck residential service shop and a 10-tech new-construction crew can land far apart. For more detail, see how much plumber insurance costs.

Your first-month checklist

If you're working out how to start a plumbing business, follow the order the license board uses. Form the entity and get your EIN. Apply for the state or local license with GL and the bond ready, since many boards want both first.

Then add commercial auto, workers' comp at your first hire, tools coverage and COIs with real endorsements behind them. Do it in that order and your first GC job won't wait on paperwork. When you're ready, tell us about your shop and we'll shop 12+ A-rated carriers for you.

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