Start a trade business

How to start a plumbing business

In most states the license is the gate: you need the right plumbing license before you can pull permits under your own company. After that, it is entity, insurance, a stocked van, a price book, and a way to track every call.

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To start a plumbing business, first confirm you hold (or can hire someone who holds) the license your state requires to run a plumbing company and pull permits. Then form an entity, get an EIN, buy liability, auto, and workers' compensation coverage, post any license bond your state or city requires, stock a van, build a flat-rate price book, and set up dispatch, invoicing, and job tracking. Licensing comes first in plumbing because most states and many cities will not let an unlicensed company contract for the work at all.

Step by step

  1. Check the license path. The Bureau of Labor Statistics notes that most states and some localities require plumbers to be licensed, often with 2 to 5 years of experience and an exam before working independently. Some states license gas line work separately. Many states also distinguish a journeyman license from the master or contractor license needed to run a company. Start with your state at the contractor license hub.
  2. Write a plumbing business plan. The U.S. Small Business Administration describes a traditional plan (market analysis, services, marketing, funding, financial projections) or a one-page lean plan. Decide on service and repair, remodel, new residential, or commercial work, because each needs different equipment, staff, and cash.
  3. Form the entity. An LLC or corporation separates business and personal risk. Register the name and any DBA with the state.
  4. Get an EIN. The IRS issues it free online. Do not pay a third-party site.
  5. Insure the business. General liability, commercial auto, and workers' compensation once you have employees. Water damage claims are the plumber's nightmare, so read the policy for exclusions.
  6. Bonds. Many cities and states require a license or permit bond. Commercial and public work adds bid, performance, and payment bonds.
  7. Open supplier accounts. Supply-house credit terms carry you between buying parts and getting paid.
  8. Equip the van. Then build the price book and start selling.

Startup cost categories

Plumbing startup costs depend heavily on whether you buy drain and sewer equipment on day one. Price each category with real quotes rather than relying on a total someone else posted. Keep receipts by category from day one so your accountant can sort them.

Plumbing startup cost categories
CategoryExamplesNotes
Licensing and registrationContractor license, exam fees, city registration, entity filingSet by state and local rules
Insurance and bondsLiability, auto, workers' comp, license bondGet quotes before pricing work
Van and upfitPurchase or lease, shelving, ladder rack, letteringUsually the biggest item
Hand and power toolsPress tool, PEX tools, cutters, threaders, torchesPress tools cost more but save labor
Drain and sewer equipmentDrum machines, jetter, inspection camera, locatorRent or sub out until demand justifies buying
Truck stockFittings, valves, supply lines, wax rings, cartridgesStock fast movers only
Software and phonesDispatch, price book, invoicing, call handlingSee plumbing software
Working capitalPayroll, water heaters, fixtures before paymentConstruction work needs more because of retainage

Pricing your work

Most service plumbers price from a flat-rate book built on cost per billable hour, not on the plumber's wage. For reference, the Bureau of Labor Statistics reported a median wage of $30.67 per hour for plumbers, pipefitters, and steamfitters in May 2025. Your burdened cost (taxes, workers' comp, benefits) plus van and overhead will be much higher per billed hour. Work it through in how to price plumbing jobs and quote from a plumbing estimate template.

Know your products, too. Federal rules require pipe, fittings, and fixtures for drinking water to meet the lead-free definition of a 0.25 percent weighted average lead content on wetted surfaces, and EPA says manufacturers and importers must certify compliance as of September 1, 2023. Buy from suppliers who stand behind that certification.

Choosing your first niche

New plumbing companies grow faster when they pick a lane. A one-van service shop that answers the phone, shows up on time, and quotes from a clear price book can fill a schedule within months. A shop that chases new-construction bids needs crews, a bigger cash cushion, and an estimator's time. Drain cleaning needs equipment and a strong back. Commercial service needs relationships with facility managers and a tolerance for slow-paying accounts. Pick the work that matches your license, your equipment, and your bank balance, then add lines as cash and people allow. Write the choice into your business plan so marketing, pricing, and hiring all point the same direction.

Getting the first customers

  • Remodelers and general contractors. Kitchen and bath remodelers need a plumber who shows up for rough-in on the day promised. Reliability wins repeat work.
  • Property managers. Turnovers and repairs on multifamily buildings are steady, paid on terms.
  • Water heater replacements. A clear, fixed-price offer brings in new customers who call back later.
  • Backflow testing. Where your area requires periodic testing and you hold the certification, recurring tests bring customers back every year.
  • Local search listings. Keep your service area, hours, and license number current; many customers check the license.

Systems to put in place

Set up a price book, a dispatch board, on-site payment, photo records for every job, and a customer list with equipment and past repairs. For remodel and construction work, track each job with a budget by phase and bill progress payments. Smart Business Automator handles project tracking, invoicing, change orders, and job costing for that side of the business; the plumbing software guide covers service tools. Do it before the first busy week. Setting up software while the phone rings nonstop means half the jobs never get entered, and you lose the job history you need to price the next ones.

Mistakes to avoid

  1. Contracting work before the company license is in place.
  2. Pricing service calls from your hourly wage.
  3. Buying a jetter and camera before you have the drain volume to keep them busy.
  4. Skipping written approval before opening walls or slabs.
  5. Not photographing existing conditions before work starts.
  6. Taking a big new-construction job without the cash to carry payroll through retainage and slow pay. See how to manage construction working capital.
  7. Letting price book prices go stale while material costs climb.

Frequently asked questions

Do I need a master plumber license to start a plumbing business?

Many states require a master or contractor-level license, held by the owner or a qualifying employee, to run a plumbing company and pull permits. Requirements vary, so check with your state's licensing board.

How long does it take to qualify for a plumbing license?

The Bureau of Labor Statistics says most plumbers learn through an apprenticeship of 4 to 5 years, and licensing often requires 2 to 5 years of experience plus an exam. Your state sets the exact rules.

Should a new plumbing company do service or new construction?

Service needs less working capital and pays at the door. New construction brings volume but ties up cash in progress billing and retainage. Many owners start with service and remodel work.

What goes in a plumbing business plan?

Your service area, the type of work you will do, your license status, pricing method, staffing, van and equipment budget, marketing plan, and a monthly cash flow forecast for at least the first year.

Sources

  1. Bureau of Labor Statistics: Plumbers, pipefitters, and steamfitters
  2. EPA: Use of lead free pipes, fittings, fixtures, solder, and flux for drinking water
  3. U.S. Small Business Administration: Write your business plan
  4. U.S. Small Business Administration: Get business insurance
  5. IRS: Get an employer identification number
Written and edited by

Maurice Francois writes and edits construction operations guides for Smart Business Automator. More from Maurice on the Scaling Legends podcast.

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