How to start a plumbing business when the license comes first

Plumbing is a trade customers cannot put off. When water is on the floor, they call until someone answers, and they remember who came. That gives a plumbing company emergency work, planned replacements and remodel work running at once. It is also a licensed trade in most states, with real health and safety stakes. Below: the work itself, licensing, two federal rules worth knowing, insurance, the van and drain gear, pricing, where early customers come from, and how the year moves.

Use this guide for orientation only; it is not legal, tax or insurance advice. Plumbing rules differ by state, county and city, so check each one with your local authority.

What kind of work does a plumbing company do?

Residential plumbing splits into service and project work:

• Emergency service: burst supply lines, failed water heaters, sewer backups, overflowing toilets, frozen pipes.
• Drain and sewer: clogged drains, main line stoppages, camera inspections, jetting, root cutting, sewer line repair and replacement.
• Water heaters: tank and tankless repair and replacement, a common planned job.
• Fixtures and repairs: faucets, toilets, disposals, shutoff valves, leaks.
• Repipes and remodels: whole-house repiping, bathroom and kitchen rough-ins, new construction.

Commercial service adds restaurants, grease interceptors, backflow testing and property management accounts. Gas line work may need a separate license or endorsement, depending on the state. Pick the services you are licensed and equipped to do well, list only those, and add more as you hire.

What license does a plumber need to start a business?

Expect licensing in most places, set by your state and sometimes your city or county. The SBA's licensing guide says licensing requirements and fees turn on what your business does and where, and its list of locally regulated activities includes plumbing. The Bureau of Labor Statistics adds that most states and some localities require plumbers to be licensed, often after 2 to 5 years of experience and an exam, and that starting your own business may require additional licensing. Common patterns in plumbing include:

• Individual license levels that build on documented hours and exams, often named apprentice, journeyman and master, though titles vary.
• A business or contractor license for the company, separate from your individual license, where your state or city requires one.
• Separate endorsements for gas piping, backflow testing, medical gas or other specialties.
• Permits and inspections for water heater replacements, repipes and sewer work, set by the local building or plumbing department.
• Local registration in cities that license plumbers on their own.

Licensing also affects your advertising. California, for example, requires licensed contractors to include their license number in construction contracts, subcontracts, calls for bid and all forms of advertising, and other states and cities have rules of their own. Our startup pages by state list the main agencies. From there, go to your state's plumbing board for the exact rules on licensing, advertising and who may pull permits.

Which federal rules matter for plumbers?

Most plumbing code is state and local, but two federal rules show up on everyday jobs.

Lead-free materials. Under Section 1417 of the Safe Drinking Water Act, the EPA explains that pipe, fittings, fixtures, solder and flux used in installing or repairing plumbing that provides water for human consumption must be lead free, defined as a weighted average of no more than 0.25% lead across wetted surfaces, and 0.2% for solder and flux. The law exempts some items, such as toilets, urinals, shower valves and devices used only for nonpotable services. Since September 1, 2023, manufacturers and importers must have covered products certified lead free, so look for the certification mark and keep non-compliant stock off your van.

Trench safety. Sewer and water line work means digging. OSHA's excavation standard, 29 CFR 1926.652, requires employees in an excavation to be protected from cave-ins by an adequate protective system, except in stable rock or where the trench is less than 5 feet deep and a competent person finds no sign of a potential cave-in. Shoring, shields or sloping cost money. Price them in, or subcontract excavation to a company that does it every day. Before any dig, contact 811, the free national before-you-dig service, to have the approximate location of buried utilities marked.

What insurance and bonds does a plumbing company carry?

• General liability, including completed operations. Water damage from a failed fitting can surface days later and run into a large claim.
• Workers' compensation when you hire. The SBA says employers must have it; the details come from your state.
• Vehicle coverage for vans, and equipment coverage for cameras, jetters and drain machines.
• License and permit bonds if your state or city requires one to register, plus performance bonds on some commercial bids.

Read our contractor insurance guide for the details on certificates and additional insured requests.

What equipment and vehicle does a new plumber need?

• A cargo van with shelving, bins and a parts inventory you restock daily.
• Hand tools, pipe wrenches, cutters, a torch kit, and press or crimp tools for the pipe systems you install.
• Drain machines: a drum machine for small lines and a sectional or larger machine for mains.
• A sewer camera with a locator, which lets you show the customer the problem and quote from evidence.
• A hydro jetter, often a second-year purchase once drain work justifies it.
• Water heater dolly, wet vac, leak detection tools, and a moisture meter.
• Protective gear for sewage work: gloves, eye protection, boots and cleanup supplies.

Rent excavation equipment until you dig often enough to own it. Price new gear from your local supply house, which also becomes your most important vendor relationship.

How should a plumbing company price jobs?

Customers call asking for a price over the phone. Few repairs can be priced honestly without seeing them, so plumbing shops answer the question with a process instead of a guess.

Whatever model you pick, build prices from your actual cost per billable hour, including drive time, warranty callbacks and supply house runs. Our job pricing guide lays out the method. Teach whoever answers your phone to explain the diagnostic fee and what it includes, because that explanation is what turns a price-shopping call into a booked visit.

How do you win your first plumbing customers?

Plumbing urgency is the opportunity. A homeowner with water on the floor is unlikely to wait for five quotes, and Thumbtack's own help pages urge pros to respond as fast as possible, noting that many customers end up choosing whoever is quickest and most helpful. So your first marketing investment is your phone.

• Answer every call, day and night. An AI receptionist can tell a caller where the main shutoff usually is (using guidance you approve), take the address, decide by your rules whether to page the on-call plumber or book the morning, and send you the details. Pair it with missed-call text back on your business line.
• A website with a page for each emergency (burst pipe, sewer backup, no hot water) and each town you serve, with your hours and license number where required.
• A Google Business Profile showing accurate emergency hours. If you say 24/7, answer 24/7.
• Property managers and landlords who need someone reliable for tenant calls.
• Real estate agents and inspectors who need sewer camera inspections and repair quotes during a sale.
• Other trades: remodelers, handymen and restoration companies who need a licensed plumber they can count on.

Paid lead platforms are active in plumbing. Angi's annual report says a single homeowner request can result in multiple paid leads, and Google decides which Local Services Ads leads get credited. If you use them, measure the jobs they produce. Each customer you get yourself should land in a CRM with the water heater age, fixture models and sewer video attached, so the next call is easier. Our plumbing industry page explains how we set that up, and our plumbing marketing ideas list has more.

Is plumbing a seasonal business?

Plumbing calls come in all year, but the mix changes with the seasons:

• Winter: frozen and burst pipes in the North, and surges in southern regions when a rare hard freeze hits homes with exposed lines. Water heaters work harder when the incoming water is colder.
• Spring: sump pumps, outdoor spigots, sewer backups during heavy rain, and real estate inspections.
• Summer: irrigation backflow, outdoor plumbing, and remodels.
• Fall and holidays: winterizing, and disposal and drain calls around big family meals.

Plan staffing for cold snaps and holidays, when calls can spike and customers still expect someone to answer.

If you are comparing trades, our guides to starting an HVAC business and starting a septic pumping business cover neighboring work. All of the startup guides live on the start a company hub. When you are licensed and ready to open, ask for a free launch plan for your phone, website and CRM.

Frequently asked questions