How to start a plumbing business

In this article

Plumbing is the most heavily regulated trade in these guides, and that is the good news. Every hour of licensing is an hour a keen amateur with a van cannot compete with you. It is also why the mistakes here are expensive: unlicensed work is not a fine, it is your livelihood.

The licence ladder

Level	What it takes	What it lets you do
Apprentice	Register with your state so your hours count. Most apprenticeships run 4–5 years.	Work under direct supervision. Register early — hours worked before you register often do not count, and people lose years to that.
Journeyman	Commonly 4,000–10,000 supervised hours plus classroom time, then an exam on the IPC or UPC.	Work independently on site without constant supervision. Not, usually, run a company.
Master	More hours on top of journeyman, plus a further exam.	Pull permits, supervise journeymen and apprentices, and act as the qualifying agent for a business. This is the level a plumbing company is built on.
Contractor licence	In many states a separate licence, testing business law, project management and safety.	Contract with customers as a business. Technical skill and the right to trade are two different permissions.
Surety bond	Usually required with the contractor licence. You pay an annual premium, not the face value.	A few hundred dollars a year for most people. Amounts vary widely by state — from a couple of thousand to $25,000 of coverage.

Every one of those varies by state, and some vary by city on top. Check your own authority rather than any article, including this one. If you are not yet a master, the honest options are: get there, partner with one, or employ one as your qualifying agent — and the third is a real cost you should price in from day one.

What it costs to open

Line	Typical	Notes
Vehicle and fit‑out	most of the budget	A van with proper racking is not a luxury. Time spent looking for a fitting in a pile is time nobody pays for.
Tools	the other big slice	Press tools, drain machines and cameras are the expensive ones. Hire them until a specific job pays for them.
Licence and bond	varies by state	Exam fees, licence fees, and a bond premium of a few hundred a year.
Insurance	liability, plus comp from your first employee	Water damage claims are large. This is not the line to shop cheapest on.
Van stock	a real, recurring cost	The single biggest lever on your billable hours. See below.
Working float	parts before payment	You buy the water heater before anybody pays you for it.

Stock the van properly, because it buys back your day

The plumbing pricing guide makes the point that billable efficiency across this industry sits near 30% — for every eight hours you pay someone, fewer than three reach an invoice. Nothing improves that number more cheaply than the van.

• Stock the parts for the ten jobs you actually do most, not the hundred you might. Every return trip to the merchant is an unbilled hour.
• Rack it so one glance finds it. Searching is unbilled too, and it is invisible because it feels like working.
• Restock at the end of the day, every day. The morning you discover an empty bin is the morning you lose a job slot.
• Carry the consumables that turn a callback into a completion — washers, valves, connectors, flex. Finishing today is worth more than the part cost.
• Track what you fit. After three months your own job records tell you what to stock better than any list.

Permits and backflow: the two that bite

These are the ones that catch new businesses, because both feel like paperwork until they are not.

• Permits. Ordinary repair and maintenance of an existing installation generally does not need one. Water heater replacement usually does, and so does installing, relocating or replacing a backflow preventer. Quoting a water heater without the permit in the price is quoting it wrong.
• Backflow. Devices typically need annual testing by a certified tester, with the certificate filed with the water provider. That certification is a separate qualification, it is recurring work, and it is a good reason to hold it — annual testing is a book of business that renews itself.
• Put permit fees and lead times on the quote as their own line. A customer who did not know about a permit thinks you invented it.

Get legal before you get customers

• Confirm exactly which licence your state and city require for the work you intend to do, and at what threshold.
• If you are not a master, decide now how you will satisfy the qualifying‑agent requirement.
• Pick a structure and get an EIN. Open a business bank account and stop buying fittings on a personal card.
• Get the surety bond your contractor licence requires, before you advertise.
• Buy general liability. Add workers’ comp the day you have an employee — it is required in most states from the first one.
• Register with your local authority for permits, and find out how their inspection scheduling actually works before you need it urgently.
• Write down what you do not do. No gas, no septic, no commercial kitchens — whatever it is, decide it in daylight.

Decide your work mix in the first month

Work	Gross margin	What it does to your life
Emergency	50–70%	The most profitable work in the trade, and the reason after‑hours cover is worth staffing rather than dreading.
Service and repair	35–55%	Your bread. Many small jobs, paid on the day, and the shape a price book is built for.
New construction	20–30%	Fills a diary on thin margins and slow terms. Useful ballast, dangerous as a foundation.

Most people who build something start on service and repair, because it pays this week and it teaches you what everything actually takes.

Price before you are busy, not after

The worst time to work out your rate is when the phone is already ringing. Do it in week one: read how to price a plumbing job, run your own numbers through the plumbing price calculator, and then build the thing that makes it stick — a flat‑rate price book.

What kills plumbing businesses in year one

• Pricing from the hourly rate alone. It ignores the 70% of the day nobody invoices, and it is the most common fatal error in this trade.
• No minimum and no trip charge. A twenty‑minute job forty minutes away is a loss with a smile on it.
• Doing permit work without the permit because the customer did not want to wait. That is your licence, not your margin.
• Chasing new construction for the volume. Thin margins plus 30–60 day terms is how a busy business runs out of cash.
• Never raising the rate. Parts and wages moved. Yours has to.

Sources

Every figure above comes from one of these, checked in August 2026. Licensing is state law and often city law on top — treat everything here as a map, and your own authority as the territory.

• Plumber licence requirements in every state — the ladder, the hour thresholds and the state‑by‑state variation, from an insurer rather than a training provider.
• Apprentice to master: the licensing path — supervised hours, classroom requirements and the IPC/UPC exams.
• Plumbing surety bonds — what a bond is, what it costs annually, and why the face value is not what you pay.
• What requires a plumbing permit — a state authority’s own list. Yours will differ in detail; the shape will not.
• US Bureau of Labor Statistics — what a plumber earns, which is where your labour line starts.
• Start‑up cost bands and the gross‑margin ranges by work type are drawn from operator reporting across several independent sources; treat them as shapes rather than quotes.