How to start a plumbing business

Most plumbers who start their own business already know the work. What they have to learn is everything around it:

• Licensing to contract
• Insurance
• Pricing a call so it pays
• Stocking a van
• Finding customers
• Getting paid before the supply house bill comes due

This guide covers those steps in the order you will need them. It stays general on purpose, because plumbing licensing and insurance rules depend on your state and city, so treat each step as a set of questions to answer where you work.

The general guide to starting a contracting business covers the parts every trade shares in more depth.

Plan the work and the market

Plumbing businesses tend to grow around one kind of work. Pick yours first.

Five kinds of plumbing work

• Service and repair: leaks, clogs, fixtures, water heaters and emergency calls. Fast jobs, paid on completion, built on response time.
• Drain cleaning: its own niche, with its own equipment and a lot of repeat customers.
• Remodels: bathroom and kitchen rough-in and trim, often for remodelers and general contractors.
• New construction: underground, rough-in and finish for builders, priced per fixture or per house, paid on the builder's schedule.
• Commercial: larger systems, different codes and longer payment terms.

Set an area you can reach fast

Then set a service area you can reach quickly. In service plumbing, the drive is unbilled time, and a customer with water on the floor wants someone there soon.

Write a short plan with quoted startup costs

Write a short plan: the work, the area, the customers, the startup costs and how you will find the first jobs. List the startup costs one by one with quotes:

• Licensing and bonds
• Insurance
• The van and its shelving
• Tools
• Opening truck stock
• A phone and software
• A cash reserve for a few months of fixed costs

Licensing and permits

Plumbing is licensed in many states and localities, often in stages:

• An apprentice works under supervision.
• A journeyman does the work.
• A master or contractor license may be needed to run a business and pull permits.

The details vary widely, so do not rely on what a colleague in another state did.

Four questions to answer before you advertise

• Ask your state's licensing board what license you need to do the work and to own the business.
• Ask the building departments where you will work about local licenses, registration and permit rules.
• Check for separate certifications for specialty work, such as backflow testing or gas piping, where you plan to offer it.
• Ask whether a bond is required. Some states and cities require a license bond or a surety bond for contractors.

Build permits into your price

Know which jobs need a permit where you work, such as a water heater replacement or a new drain line. Build the permit and the inspection visit into your price.

Set up the business

• Choose a structure. A sole proprietorship is simple; an LLC can separate business debts from personal assets. An accountant can tell you which fits.
• Get an EIN from the IRS. It is free, and you give it to builders and property managers on a W-9.
• Open a business bank account and run every payment and every supply house bill through it.
• Set up bookkeeping from day one, with income and costs recorded by job.

Insurance and bonds

Five kinds of coverage to price

• General liability: covers damage and injuries your work causes. Water damage from a failed fitting can be a large claim, so ask how your policy treats it.
• Workers' compensation: most states require it once you have employees, including apprentices.
• Commercial auto: for the van. A personal policy may not cover business use.
• Tools and equipment coverage: for the van's tools and stock.
• Bonds: a license bond if your state or city requires one.

Tell the agent exactly what you do

Get quotes from an agent who insures plumbers, and describe exactly what you do. Each of these can change the coverage:

• Gas work
• Commercial work
• Drain cleaning

Equip the van

A service plumber's van is the shop. Equip it for the calls you planned to take.

What goes in a service van

• Hand tools: pipe wrenches, basin wrench, cutters, deburring tools, crimp or expansion tools for plastic pipe, and a torch kit.
• Power tools: a cordless drill and driver, a reciprocating saw, and a press tool when your work justifies one.
• Drain tools: hand augers and a drum machine; rent a camera or jetter until you use one often.
• Diagnostics: a pressure gauge, a multimeter for water heaters, and a leak locator when you need it.
• Truck stock: the fittings, valves, supply lines, wax rings, cartridges and repair parts you use most, organized so you can see what is low.
• Safety: eye and ear protection, gloves and respirators for the work you do.

Keep truck stock lean and charge every part

Truck stock is money sitting in the van. Keep it lean, restock from each job's parts, and charge every part you use.

Price your work before your first call

A plumbing price has to cover the drive, the diagnosis, the parts, the time and the callbacks, and still leave a profit.

Five pricing steps before your first call

1. Add up your overhead: the van, fuel, insurance, licenses, tools, phone, software and marketing.
2. Work out your labor rate: wages, payroll taxes, workers' comp and overhead, spread over the hours you will actually bill. The labor rate guide and the labor rate calculator walk through it.
3. Set a trip charge or a minimum, so a short call still pays for the drive.
4. Choose flat rate or time and materials for repairs, and build either from your own hours and parts costs.
5. Know your break-even: the break-even calculator shows how many calls a month cover your fixed costs.

Price fixtures and repairs line by line

The plumbing pricing guide works through fixture and repair pricing line by line.

Get your first customers

• Referrals: everyone you have worked with or for. Ask every happy customer to pass your name along.
• Property managers: a steady list of repairs, if you answer fast and invoice cleanly.
• Remodelers and general contractors who need a reliable plumber for rough-in and trim.
• Real estate agents and home inspectors, who find repairs before a sale.
• Local search: a complete free business profile on the map apps homeowners use, with your service area and hours, and a request for an honest review after every job.

Track where each call came from

Keep track of where each call came from. After a few months you will know whether referrals, property managers or your online profile bring the work worth having, and you can spend your marketing time there.

Emergency calls win loyal customers

Emergency calls win loyal customers. If you take them, answer the phone, give a clear after-hours rate, and show up when you said you would.

Estimating and invoicing

On a service call, the estimate and the invoice are often written in the same hour. Get the price agreed and signed before you start, so there is no argument at the end.

Have three documents ready

• An estimate that lists the repair, the parts and any permit, with exclusions such as wall or floor repair. The estimate guide covers what goes in it, and the plumbing estimate template gives you a layout.
• A change order for what you find behind the wall.
• An invoice with your payment terms, sent before you leave the driveway. The free invoice generator will do for the first jobs.

Cash flow

Service plumbing has a cash advantage: you can be paid the day you do the work. Use it.

Five ways to keep cash coming in

• Collect at completion on service calls, and make paying easy, by card, bank transfer or the methods you accept.
• Take a deposit on remodels and water heater replacements before you buy the equipment.
• Open a supply house account and pay it on time. Good credit terms are cash flow.
• Watch builder terms. New construction often pays at stages and later than homeowners do. The get paid faster guide covers terms and follow-up.
• Set aside tax money from every payment. The self-employment tax calculator shows how much to plan for.

Hiring helpers and apprentices

When the phone rings more than you can answer, you will need help.

Check supervision rules before you hire

Licensing rules usually say who may do plumbing work and under whose supervision, including how many apprentices one licensed plumber may supervise. Check them with your licensing board before you hire.

Employees and subs bring different paperwork

• Employees bring payroll taxes and workers' comp.
• Subcontractors need a W-9, a certificate of insurance and a written scope.

Whether someone is an employee or a contractor depends on how you direct the work, so ask an accountant before you pay anyone.

Warranties, callbacks and records

A plumbing repair is judged when the customer next turns on the tap.

Set your warranty before the first job

Decide your workmanship warranty before your first job:

• What it covers
• For how long
• What it excludes, such as fixtures the customer supplied

Put it on every estimate and invoice, and keep it separate from the manufacturer's warranty on a water heater or a faucet.

Keep records that explain every callback

Every callback is an unbilled trip, so your overhead has to carry them, and your records should show why each one happened.

• Photograph the work before walls and floors close up.
• Note the parts and model numbers you installed.
• Keep each customer's history together.

When the same customer calls in two years, you will know what is behind the wall.

Plumbing by the numbers

According to the Bureau of Labor Statistics' Occupational Outlook Handbook (Plumbers, Pipefitters, and Steamfitters, last modified August 27, 2026), the median annual wage for plumbers, pipefitters and steamfitters was $63,800 in May 2025, and employment in the occupation is projected to grow 7% from 2025 to 2035.

Wage figures describe workers, not owners

Those figures describe plumbers who work for wages, not business owners. They are a useful reference for what you may pay a licensed plumber and for the pay part of your labor rate.

What an owner earns is the margin between what the business charges and what the work costs.

Starting with BuildWell

BuildWell handles the estimate-to-payment paperwork from your phone. Describe the job by voice, text or photos, and it writes an itemized estimate:

• Parts priced at stores near the job, checked within the last 30 days.
• Labor starting from your metro's median wage for the trade, plus the overhead and markup you set.

Change any line, then send it

Change any line before you send it. Add your logo, license number and terms once.

The signed estimate becomes the invoice

The customer signs on their phone, and the signed estimate becomes the invoice. Customers pay by card or bank transfer through Stripe, or by the Zelle, Venmo, Cash App, PayPal or check details you list, and BuildWell reminds you when an invoice is due or overdue.

The plumbing industry page shows how it works for plumbers. BuildWell is not bookkeeping or payroll software, so you will still want a bookkeeping system and an accountant.

A plumbing startup checklist

• Work, service area and customers chosen
• Licensing confirmed with your state's licensing board and local building departments
• Business entity, EIN, bank account and bookkeeping
• General liability, workers' comp, commercial auto and any required bond
• Van, tools and lean truck stock
• Labor rate, trip charge, minimum and flat rates worked out
• Estimate, change order and invoice ready
• A supply house account and a plan to collect at completion