How to Start a Plumbing Business: Licensing, Pricing and Getting Calls

Plumbing is a strong trade to build a business on. People can't wait long when a pipe bursts or the water heater fails, licensing keeps unqualified competition down, and service work leads to bigger jobs like repipes, water heaters and sewer lines. The challenge is that being a licensed plumber isn't the same as running a profitable plumbing company: pricing, cash flow, marketing and hiring decide whether you grow or stay a one-person shop that works every weekend.

1. Licensing comes first

The Bureau of Labor Statistics notes that most states and some localities require plumbers to be licensed. The typical path:

• Apprenticeship: several years of paid training on the job plus classroom hours.
• Journey-level license: after the apprenticeship and a licensing exam, journey-level plumbers can work independently. The BLS says states and localities often require 2 to 5 years of experience plus an exam.
• Master plumber: plumbers with several years of experience who pass another exam earn master status. Some states require master status before you can get a plumbing contractor license, or require the business to have a licensed master who qualifies it.
• Gas lines: some states require a separate license for gas work.

Contractor licenses usually also require proof of insurance and often a bond. Some cities and counties have their own licenses and registrations, and you'll pull permits for water heaters, repipes and sewer work in many places. Check your state plumbing board and local building department; don't advertise services your license doesn't cover.

If you'll disturb painted surfaces in homes built before 1978, for example cutting into painted walls to reach pipes, the EPA's Renovation, Repair and Painting (RRP) rule may apply, and the EPA names plumbers among the trades covered. Firms must be EPA- or state-certified and use certified renovators trained by an EPA-accredited provider. Jobs disturbing 6 square feet of paint or less per room inside (20 square feet outside) are exempt as minor repair, but window replacement and demolition of painted surfaces are always covered.

2. Decide on your focus

• Residential service and repair: leaks, fixtures, clogs, water heaters. The most common start, with fast payment and lots of repeat customers.
• Drain and sewer: drain cleaning, camera inspection, hydro jetting and sewer line repair. Strong demand and margins, but specialized equipment.
• Water heaters and water treatment: replacements, tankless conversions, softeners and filtration.
• Remodeling and new construction: larger jobs through general contractors and builders, with slower payment and tighter margins.
• Commercial service: restaurants, offices and property managers. Recurring work, after-hours calls and higher insurance limits.

Many plumbers start with residential service, then add drain and sewer equipment once cash flow allows.

3. Register the business

1. Form an entity. An LLC or corporation protects personal assets from business liabilities; ask an accountant which fits.
2. Register with your state and file a DBA if you'll operate under a different name.
3. Get a free EIN from the IRS. It's issued immediately online if approved; you'll need it to hire and to open a business bank account.
4. Get your plumbing contractor license for the business where required, and local business licenses.
5. Open a business bank account and keep every business payment there.

4. Insurance and bonds

• General liability: covers property damage and injuries to others. Water damage claims can be expensive, so ask your agent how the policy handles them.
• Workers' compensation: required by state law in most states once you have employees (rules and exemptions vary by state). You'll also pay state unemployment insurance tax, and a few states require short-term disability coverage.
• Commercial auto for service vans.
• Tools and inventory coverage for what you carry in the vans.
• License or surety bonds where your state or city requires them.

5. Van, tools and inventory

• A service van with shelving organized so technicians find parts fast. It's also your best billboard: put your name, phone number and license number on it.
• Core tools: pipe wrenches, cutters, PEX and press tools, a soldering and brazing kit, a drain snake, a moisture meter and a water pressure gauge.
• Drain and sewer equipment if you offer it: drum machines, a sewer camera and locator, and later a jetter.
• Fast-moving parts: fill valves, flappers, supply lines, cartridges, P-traps, fittings, shutoff valves and water heater parts. The more you fix on the first visit, the more money each call makes.

Buy specialized equipment when the work justifies it, and track inventory so the vans don't become a pile of unused parts.

6. Flat rate pricing for plumbers

Many plumbing businesses move from hourly billing to flat rate pricing: each task has a fixed price in a price book, and the customer approves it before you start. Homeowners prefer knowing the price up front, speed isn't penalized, and arguments over hours disappear.

To build a flat rate price book:

1. Calculate your true hourly cost. Add your yearly overhead (vans, insurance, software, office, marketing, your own salary) and divide by the hours you actually bill, not the hours you work. Drive time, estimates and callbacks aren't billable.
2. Time each task. Use the average time for a typical job, including setup and cleanup.
3. Add materials with markup.
4. Add profit.
5. Offer options for larger repairs and replacements: good, better and best (for example a standard tank water heater, a higher efficiency model, or tankless).

Present the price before work starts and get approval in writing, on paper or in your software. Our free contractor estimate template and invoice template work until you move to software with a built-in price book.

7. Software for scheduling, estimates and invoices

Plumbing software handles call booking, dispatching, price books, estimates with options, invoices, card payments and service agreements. It helps a small shop look like a bigger company and frees your evenings from paperwork. Compare options in our guide to the best plumbing software, and see what the popular tools cost in Housecall Pro pricing and ServiceTitan pricing.

8. Get your first calls

• Google Business Profile: most emergency calls start with a Google Maps search. Set yours up as a service-area business with accurate categories and hours. See our Google Business Profile guide for contractors.
• Reviews after every job. See how to get more Google reviews.
• A fast website with your services, areas, license number and a click-to-call button. See plumbing website design.
• Local SEO: service and area pages that match what people search. Our local SEO guide for plumbers covers it step by step.
• Paid search: Google Ads for plumbers and Google Local Services Ads can bring calls in the first weeks while organic rankings build.
• Referral partners: real estate agents, home inspectors, property managers, remodelers and other trades.

9. Hire your first plumber or apprentice

Hire when you're turning away calls or your own wrench time leaves no room to run the business. Check that every hire holds the license your state requires for the work they'll do, and that apprentices are supervised as your state requires. Classify workers correctly: under the IRS's tests, and stricter tests in some states, workers whose schedules you set and whom you equip with vans and tools are usually employees, not independent contractors. The BLS reports median pay for plumbers, pipefitters and steamfitters of $63,800 a year in May 2025, and projects employment to grow 7 percent from 2025 to 2035, so plan to compete for good people on pay, training and scheduling.

Plumbing business startup checklist