Most plumbing companies are started by a plumber who got tired of making money for someone else. The skills transfer. The rest doesn't, at least not automatically: pricing for overhead, answering the phone at 11 p.m., carrying insurance, chasing payments and deciding whether to buy a jetter or a second truck.
This guide walks through starting a plumbing business in a practical order: licensing, choosing your niche, forming the business, insurance and bonds, startup costs, pricing, systems, marketing and your first hires. It's written for a licensed or soon-to-be-licensed plumber starting a residential service company, with notes for other niches.
Is plumbing a good business to start?
Demand is steady and hard to postpone. When a pipe bursts or a drain backs up, the customer needs someone today. The Bureau of Labor Statistics counts about 510,600 plumber, pipefitter and steamfitter jobs in 2025, projects 7% growth through 2035, and reports a median wage of $30.67 an hour in May 2025 (BLS).
Residential service plumbing has less seasonality than HVAC, but more emergencies, more hidden problems and a wide spread of ticket sizes, from a faucet cartridge to a sewer replacement. That shapes everything from how you price to how you staff the phone. Our plumbing industry hub covers how the work pays once you're running.
Step 1: Qualify for your license
Plumbing licensing is set by states and, in many places, cities or counties. The BLS notes that most states and some localities require plumbers to be licensed, typically after two to five years of experience and an exam (BLS).
Depending on where you work, starting a company may involve:
- A journeyman license to do the work, and a master plumber license to supervise or run a company.
- A plumbing contractor license or registration, sometimes requiring a licensed master as the qualifying party.
- A business and law exam in addition to the trade exam.
- A surety bond and proof of insurance.
- A city or county registration to pull permits there.
- Separate certifications for specialty work, such as backflow prevention testing, medical gas or gas piping, where your jurisdiction requires them.
Start with the SBA's licenses and permits guide, then your state plumbing or contractor licensing board, then the building departments where you'll work. Ask each one: what license do I need to contract plumbing work and pull permits in my company's name? We don't list state rules here because they vary and change.
Keep your experience records organized now: employers, supervisors, dates and hours. Applications often ask for them.
Step 2: Choose your niche
"Plumbing" covers several different businesses. Pick a starting focus:
- Residential service and repair: leaks, fixtures, toilets, disposals, shutoff valves. High volume, smaller tickets, lots of phone calls.
- Drains and sewer: drain clearing, camera inspections, sewer repair. A reliable earner and a door-opener, with more equipment.
- Water heaters: repair and replacement, tank and tankless. Predictable big tickets.
- Remodel and repipe: larger projects with longer sales cycles.
- New construction: bids, schedules set by builders, progress payments and thinner margins.
- Commercial service: contracts, purchase orders, net terms.
Most one-truck shops start with residential service plus water heaters and basic drain work, then add a jetter and camera once drain volume justifies them.
Step 3: Form the business
- Choose a structure. Sole proprietorship, LLC, partnership or corporation. The SBA compares them. Many trade businesses choose an LLC; ask an accountant or attorney in your state, especially if your license must be tied to the entity.
- Register with your state and register a trade name if needed.
- Get an EIN from the IRS, free (IRS).
- Open a business bank account and keep personal money separate.
- Set up bookkeeping and ask your accountant about sales tax on parts and fixtures in your state.
Step 4: Get insured and bonded
The SBA's business insurance guide covers the main types. For plumbing:
- General liability. Water damage claims can be expensive. Review your limits with an agent who insures plumbers.
- Commercial auto for your service vehicle.
- Tools and equipment coverage for cable machines, jetters and cameras.
- Workers' compensation once you have employees; rates for plumbing reflect the physical risk.
- Surety bond if your license or customers require one.
Property managers and commercial customers often require specific limits and to be named as additional insured.
Step 5: Budget your startup costs
National "cost to start a plumbing business" figures aren't much use, because your costs depend on what you already own, the niche you choose and your state's license and bond rules. Build your own budget with real quotes, using the SBA's startup cost categories.
One-time costs
- Licensing, exams, bonds and business formation.
- Service vehicle (purchase, lease down payment or upfitting), shelving, bins, ladder racks and lettering.
- Hand and power tools, pipe cutters, press tools, soldering and brazing equipment, test equipment.
- Drain equipment: hand cables and a drum machine to start; a jetter and sewer camera when volume justifies them.
- Initial truck stock: cartridges, wax rings, supply lines, valves, fittings, flappers, fill valves, common water heater parts.
- Website, logo and initial marketing.
Monthly costs
- Insurance, vehicle payment, fuel and maintenance.
- Phone, answering and software.
- Marketing.
- Your own pay. Budget it now.
Working capital. Keep three to six months of expenses in the bank. Supply house accounts, slow-paying customers and big water heater or repipe jobs that need materials up front all draw on cash. Our home service business plan template gives you a budget and first-year forecast to fill in.
Step 6: Set your prices
New owners often underprice because they remember their old employer's prices and assume they were too high. Then they learn what a truck, insurance, an answering service and unbilled drive time actually cost.
Do the math from your costs:
- Cost per billable hour: your pay (and later your plumbers' wages) plus payroll taxes, workers' comp and benefits, divided by the hours you'll actually bill.
- Overhead per billable hour: truck, insurance, phone, software, marketing, accounting, divided by billable hours.
- Profit, added as a margin.
Then build flat-rate prices for the 25 to 40 jobs you'll do most often:
Task price = (task hours × hourly cost + parts) ÷ (1 − target margin)
Our guide to pricing plumbing jobs walks through each step with a worked example, and the labor rate calculator does the arithmetic.
Before your first call, also decide:
- Your diagnostic or trip fee, and whether it's credited toward approved work.
- Your after-hours fee or multiplier, stated to the caller before dispatch.
- Water heater packages that include fittings, venting or code upgrades, permit and haul-away.
- A simple maintenance plan: an annual inspection with a water heater flush and fixture check, priority service and a repair discount.
Step 7: Set up your systems
When the phone starts ringing, there's no time to build a process. Set up, at minimum:
- Call handling. Plumbing emergencies go to whoever answers. Decide who answers when you're under a sink, and use missed-call text back or an answering service after hours.
- Customer and equipment records: address, contact, water heater make, model, serial and age, and service history.
- Scheduling with arrival windows and room for emergencies.
- Estimates and invoices from your price book, sent from your phone.
- Payments: card at the door and text-to-pay links.
- Bookkeeping sync with your accounting software.
A one-truck shop can manage with simple tools. Once you add a truck or office help, field service software that puts it in one place pays off. TradesWork has an AI receptionist and missed-call text back that handle flooding and gas-smell calls safety-first, a flat-rate price book with good-better-best options, and water heater records that work out the unit's age from a photo of the data plate. Our buyer's guide covers how to compare options.
Step 8: Start marketing
- Google Business Profile. Complete every field, set your service area, add real photos and ask every customer for a review. Emergency searches happen on phones, and the map results get the calls.
- Answer every call. A missed call from a new customer with water on the floor is a lost job.
- Referral partners. Realtors, property managers, home inspectors and general contractors.
- Your own customers. Water heater age and last drain cleaning make for useful, specific reminders.
- Lead services and ads. Useful to fill gaps early, as long as you track the cost per booked job.
Our plumbing marketing guide goes deeper on Local Services Ads, SEO, paid search and tracking.
Step 9: Make your first hires
Two signals it's time: you're turning down or delaying calls, or office work is eating your billable hours. Many owners hire part-time office help first: someone who answers the phone, books calls and sends invoices frees up more billable time than you'd expect.
When you add plumbers or apprentices:
- Set up payroll, state payroll taxes, unemployment insurance and workers' comp.
- Check your state's apprentice registration and supervision rules.
- Write down how you want calls run: diagnosis, showing the customer what you found, presenting options, collecting payment.
- Rework your labor rate with real wages and burden.
Common mistakes to avoid
- Contracting work before you hold the right license for your business to do so.
- No diagnostic fee, so small calls lose money.
- Unpriced after-hours calls.
- Quoting hidden problems before diagnosing them. Use a camera on recurring drain issues.
- No cash cushion for big jobs and slow-paying customers.
- Doing all the admin yourself for too long.
Your startup checklist
- License to do the work and license or registration to contract it, confirmed with your state and city.
- Niche chosen, with drain equipment planned to match.
- Entity registered, EIN obtained, business bank account open.
- General liability, commercial auto, tools coverage, bond and (with employees) workers' comp in place.
- Startup budget by category, with three to six months of working capital.
- Labor rate, diagnostic fee, after-hours fee and top 25 flat-rate prices set.
- Water heater packages and a maintenance plan defined.
- Call handling, scheduling, invoicing, payments and records set up.
- Google Business Profile live and review requests running.
