Most plumbing companies start the same way: a plumber who is tired of making money for someone else. You already have the hard part, which is the trade. What you are missing is a short list of paperwork, a bank account, and a way to price work that does not quietly lose money. This guide is that list, in the order it actually happens.
One honest note on scope: licensing, bonding, and insurance requirements are set state by state and sometimes city by city, and any guide that quotes you exact hours, fees, or bond amounts without knowing your state is guessing. Where the rules vary, this guide says so and tells you who to ask instead of inventing a number.
Get the license squared away first
Nearly every state licenses plumbing work, and most run some version of the same ladder: apprentice, journeyman, then master or contractor. Owning a plumbing company generally requires the top rung, or employing someone who holds it, and the sit-for-it requirements (years documented under a license, an exam, sometimes both) differ enough by state that the only source worth trusting is your state's licensing board.
- Search your state's contractor or plumbing board directly and read the license classes on the official site. It is dry reading and it is twenty minutes that saves you from planning a business you cannot yet legally run.
- Get your work history documented now. States that require proof of hours want employer records, and the boss you left on good terms answers that letter a lot faster.
- If you hold journeyman and the master exam is between you and the license, that exam is the real first step of the company. Schedule it before you buy anything with a logo on it.
Form the company before the first invoice
You want the business to be a thing that is not you before money moves. For most one-truck starts that means an LLC, an EIN from the IRS (free, online, same day), and a business checking account that no personal spending ever touches. An accountant who works with trade contractors is worth a real conversation here; the entity choice has tax consequences that depend on your state and your income, and this is exactly the kind of decision that costs a few hundred dollars to get advice on and thousands to redo.
The company also needs a name your county will register and your customers can spell after hearing it once over a bad connection. Check the name against your state's registry and the domain before you paint it on anything.
Insurance and bonding, without the mystery
Plumbing failure modes involve water, which is why nobody will let you skip this section. The standard stack for a new shop is general liability insurance, a contractor bond where your state or city requires one, commercial auto on the truck, and workers' compensation once you have an employee (in many states, from the very first one). Amounts and requirements are set locally: your licensing board states what is mandatory, and a commercial insurance agent who handles contractors will quote the rest in one call. Budget for it as a real monthly cost of being in business, because it is one.
Do the money math before you price a single job
This is the section that separates the shops that make it from the shops that work hard for three years and close. Your hourly rate is not what the shop across town charges, and it is not what feels fair. It is arithmetic: every cost of running the company for a month, divided by the hours you can actually bill, plus the profit you are in business to make.
- Run your own numbers through the method in the hourly floor, which derives what an hour must earn from your own costs instead of a planted benchmark, and the hourly rate calculator does the arithmetic.
- Know your break-even: the number of billed hours per month where the company stops losing money. Every month starts there, not at zero.
- Decide how you price: flat rate off a price book, time and materials, or both. There is a lot of religion in that argument and not much math; we wrote an honest comparison in flat rate without the religion, and the short version is that repeatable work wants a book and genuinely unknown work wants a clock.
The trade keeps a plumbing company busy. The hourly floor keeps it alive. They are different skills, and the second one is learnable in an afternoon.
The first truck and the first tools
You have run someone else's truck for years, so you already know the real list, and it is shorter than the catalog wants you to believe. The mistake first-year owners make is financing a new van and a full loadout before the revenue exists to carry the payment. A clean used van, the tools you actually reach for weekly, and a drain machine rent-versus-buy decision made honestly will do the first year's work. The company buys the nice-to-haves out of profit, not out of the startup loan.
Getting the first jobs
For a local service trade, the boring channels are the ones that work, and most of them are free at the start.
- Set up a Google Business Profile completely and correctly: real photos of real work, your service area, your license number where your state wants it displayed. Our Google Business walkthrough covers the setup that matters.
- Local Services Ads put you at the top of the search page and charge per lead; they require your license and insurance to verify, which is one more reason to finish those sections first. The Local Services guide explains the mechanics.
- Tell every GC, realtor, property manager, and supply-house counter person you know that you are open. The first six months of most new shops run substantially on referral from people who already trusted the plumber before there was a company.
Running the day so it holds at truck three
At one truck, your memory is the dispatch system and it works. The failure arrives with growth: the whiteboard, the group text, and the pile of paper that each hire multiplies. We wrote about the exact moment that system breaks in the whiteboard problem, and the one-week migration plan in that piece is vendor-neutral.
When you do reach for software, buy it with a method instead of a demo feeling; how to choose field service software is the seven-question version. For calibration on what honest pricing looks like: Thorbis is $99 a month per company with unlimited people and usage billed on top, the price is posted, and the product is pre-launch with a waitlist while the operating loop is finished in the open. That is us; hold anyone you evaluate, including us, to the checklist in what to demand from software.
Frequently asked questions
Can I start a plumbing business without a master license?
In most states, running a plumbing company requires a master or contractor license on the books, either yours or a qualifying employee's. The specifics are your state board's to state; read the license classes on the official site before making any plan that depends on the answer.
How much does it cost to start?
Honestly: it depends on the truck. The license, entity, and insurance stack usually lands in the low thousands; the vehicle decision dominates everything else. A shop that starts with a paid-off used van and rented specialty equipment needs dramatically less runway than one that finances new everything, and the revenue does not know the difference.
When should I hire the first tech?
When you are turning away work you could profitably book, not when you are merely busy. Run the numbers first: a hire only makes sense at your rates if the break-even math says the added hours cover the added cost. And unlimited-seat software pricing means the hire should raise your payroll, not your software bill.
Flat rate or time and materials?
Both, honestly applied: a price book for the repeatable jobs you can price from history, T&M for the genuinely unknown ones. The full argument is in flat rate without the religion.
The short version
License first, entity and bank account second, insurance third, the hourly floor before the first quote, a used truck before a new one, the boring marketing channels done completely, and a system for the day before the day outgrows your memory. The trade you already have. This is just the company around it.