How to Start a Plumbing Business
Nobody negotiates over a burst pipe at two in the morning, and the license that lets you answer that call is the same thing keeping competitors out. Here is what a plumbing business costs, what it pays after you replace yourself, and why the license rather than the truck is the asset.
Chris Scott — former CDFI director and SBA management
As the director of a Community Development Financial Institution (CDFI), and as management at the U.S. Small Business Administration (SBA), I saw thousands of business plans and loan applications cross my desk. That work is where I learned what a durable business looks like on paper, and what a business that only looks durable looks like on paper.
It is not, however, where the list of fifty came from. That came from years of research, running category after category through the same four questions: Is it profitable? Does it have recurring revenue? Is it recession resistant? Is it AI resistant? Those four questions are the framework behind the book, The Microbusiness Millionaire, and they are what separated the categories that built real wealth from the ones that quietly built a job with a P&L attached. Fifty survived the screen. Far more never made it through.
Plumbing is one of the fifty, and one of only nine that carry no structural condition at all. What follows is the market, the four questions, the three ways in and what each costs, how people fund it, and the one calculation that decides whether you own a business or a very demanding job.
The industry: enormous and stubbornly fragmented
The U.S. plumbing industry is about $191.4 billion in 2026, growing at a 3.1% compound rate over the past five years, spread across roughly 129,000 businesses. [S1] No one dominates it.
That fragmentation is half the opportunity. The retirement wave inside it is the other half: a large share of those companies are owned by tradespeople in their sixties with no succession plan, which is exactly the seller you want across the table.
Plumbing employment is projected to grow 4% from 2024 to 2034, with about 44,000 openings a year. Most of those come from people retiring out of the trade rather than the trade expanding. [S2] What you would have to pay a licensed plumber, and above that a first-line supervisor of construction trades, is the price of replacing yourself. Both rates move by market, and licensing rules move them further from one state to the next. Look up your own; the Resource Directory in the free tools shows where. Every profit number later in this article has to survive it, and the real cost runs higher once payroll taxes and insurance go on top.
That last detail matters more than the growth rate. The constraint in this industry is licensed people, and it is tightening rather than easing.
Why plumbing made the list
Every category in the research had to clear four tests. Clear three and you usually have a self-employed job in disguise.
Does it pay after you replace yourself? It does, and the reason is structural rather than lucky: the license restricts who can compete, and emergency work is priced by urgency rather than by negotiation. That is measured after paying the crew and a supervisor to do the job you have been doing for free.
Does the revenue recur? Not through contracts the way cleaning does, but through something nearly as durable: an installed base. Every water heater you fit is a customer for the next one. Service agreements, commercial accounts and repeat residential work compound into a customer list that produces without new marketing.
Does it survive a recession? A burst pipe is not a discretionary purchase. New-construction plumbing is cyclical and does get hit — but service and repair work is need-based and holds through downturns. The mix is the thing, and I will come back to that.
Will it still need humans in ten years? Someone has to be under the sink, in the crawlspace, with hands on the fitting. Software can dispatch the truck. It cannot solder a joint. Very low AI exposure.
Four for four, in a trade where the barrier to entry protects you for as long as you hold it.
The research on this category kept returning to a deal shape that looks fine until one question is asked. Good company, good numbers, a capable buyer — and the seller is the only master plumber on the payroll while the buyer holds no license, planning to sort that out after closing. Ask what happens to the business the day the seller's license walks out the door and the room usually goes quiet, because the answer is obvious once it is said aloud. From the lending side of the desk this is the single most important thing to establish in a plumbing file, ahead of the revenue and well ahead of the equipment. In this trade the license is not paperwork. It is the asset, and deals live or die on who holds it and whether there is a second one on the bench.
What it takes to make this one work
A note on the tags. Every category in the fifty cleared the same four tests; far more never made it through. The tags do not grade a business — they tell you what has to line up for it to work in your hands. Plumbing carries the Works anywhere tag: one of only nine categories with no structural condition, no season to cover and no geography that decides it. Every building in every market has pipes in it.
What does matter is entirely inside your control, and it is the subject of the rest of this article: who holds the license, whether a second one sits on the bench, and how the work splits between service and new construction.
What it costs to get in — the three paths
| Path | Typical cost range | Best for |
|---|---|---|
| Startup | $25,000 – $60,000 | Master plumber license + truck + tools |
| Acquisition (lower-quartile) | ~$293,000 | Established customer list + licensed crew |
| Franchise | $122,000 – $287,000 | Branded marketing + lead flow. Examples: Mr. Rooter, Benjamin Franklin Plumbing. |
Franchise brands are named as examples, not endorsements. Franchise investment figures reflect a franchisor's most recent Franchise Disclosure Document (FDD) and change annually — verify each brand's current FDD (Item 7 for the initial-investment range; Item 19 for any financial-performance representation) before pursuing one. [S3]
Notice the startup number is low and the acquisition number is high. That spread exists because the license is the gate. If you already hold a master plumber license, you can start for the price of a truck and tools.
If you do not, you are either spending years earning one or buying a company that already has licensed people on the payroll — which is precisely why acquisitions in this trade command around $293,000.
That larger number is where the book's trades path spends three years saving on a single income before buying anything, funded through an SBA microloan first and a larger acquisition loan afterwards.
How people actually fund it
A ~$293,000 acquisition is beyond most first-time buyers' savings and beneath most big banks' interest. That gap is where I spent a decade, and it is where this category lives.
That range sits in CDFI direct lending and SBA Community Advantage territory, and Community Advantage carries up to $350,000 — so a deal at around $293,000 fits inside the framework's lane with room to spare.
One pattern I watched from the lending chair, across every industry that came through: a qualified buyer walks into a national bank, gets declined, and concludes they cannot be funded. They never learn that a CDFI across town, or a Community Advantage lender, exists precisely for deals this size. Two free national directories will show you the ones near you — the Opportunity Finance Network CDFI locator and SBA Lender Match. [S4]
A $25,000 to $60,000 startup is a different tier altogether — often an SBA Microloan, sometimes savings, sometimes a deliberately small loan taken to build a credit history and a lender relationship you will want later.
Finding the lender is the easy half. A plumbing company also has two specific tells an underwriter looks for: the service-versus-construction revenue mix, and who holds the license and whether a second one sits on the bench. The first says whether the revenue survives a downturn; the second says whether the business survives a departure. Start recording both before anyone asks.
The profit reality: owner-replacement cash flow
Here is the calculation that decides more of these files than anything else in them.
A plumbing company looks profitable because the owner is running calls, quoting jobs, managing the crew, and doing the books — none of it priced. The honest test: after you pay the crew, and after you pay a field supervisor a market wage to run the day-to-day the way you run it, is there enough left for you to own the thing?
Real numbers. Two wages decide this one: what a plumber costs you, and what a first-line supervisor of construction trades and extraction workers costs you. [S2] [S5] Neither is a national constant. The second is the one that sets the bar, because it is the job you are actually doing.
Those are two different statistics, and it is worth saying so rather than quietly averaging them together. The supervisor figure is a mean, which sits above the median for this occupation, so it is the conservative end of the range — which is exactly where you want to be when the question is whether a deal survives. Whatever the company reports as profit has to survive paying both.
Say the books show $324,000 on $1.2 million in revenue. That is real money — until you notice the supervisor's wage is not inside it, because you were going to be the supervisor. Subtract it and you are looking at a different business. If the profit only exists because you work for free, it was never profit. It was a job paying the supervisor's wage plus whatever is left, and you find that out the day you try to buy a second truck.
The category-level math is easy — you just did it. Running it on a specific company, where the seller's "profit" includes his own unpaid labor and the service-versus-construction mix is buried in the job history, is where people freeze. That is the job of the course, Microbusiness Millionaire: Operating System — the four tests turned into a repeatable screen you run on a real deal.
The benefits of owning a plumbing business
Pricing power that comes from the license. Restricted competition and urgent, non-negotiable work is an unusual combination.
The license is a moat. An obstacle to you once, and a permanent one to everyone who might otherwise compete.
Need-based demand. Nobody negotiates over a burst pipe at 2 a.m.
AI resistance. Hands on the fitting, in the crawlspace — work that needs a person under the house.
An anchor for a multi-trade platform. Plumbing plus HVAC plus electrical is the classic home-services roll-up — one brand, one dispatch, three trades.
A large retiring seller pool. Thousands of licensed owners near retirement with nobody to hand the company to — a buyer's market for anyone prepared.
What separates the strong operators from the struggling ones
License succession settled early. The defining question in this category. A second licensed name on the payroll is what lets the company run without you — and what lets it be sold at all.
The owner-replacement math done first. Put a supervisor's wage into the numbers before counting anything as profit, and the day you hire one changes nothing about your cash flow.
Service weighted alongside construction. New-construction work moves with the builders; service and repair does not. A business carrying both rides out the years when building slows.
Emergency work priced properly. After-hours calls are worth a premium because they are worth a premium. Charging it is what stops you subsidizing customers with your own sleep.
Systems before hiring. Put dispatch, quoting and callback handling on paper first, and quality survives every departure after that.
Density before trucks. A second truck earns its keep when the calls are clustered. Tighten the map before adding the vehicle.
Licenses, permits, and regulations
Plumbing is licensed in most jurisdictions, and the master plumber license is the gating credential — typically requiring years of documented apprentice and journeyman hours plus an exam.
One detail decides which of the three paths is open to you: whether the license attaches to a person or to a company. Some states let an unlicensed owner operate provided a licensed master is on staff; others require the owner to hold it. Requirements and reciprocity vary substantially, and this is the question to settle before you spend money on anything else.
Beyond the license: a registered entity, general liability and workers' compensation, bonding for many commercial jobs, and local permitting on most installs. Start with your state licensing board and the free SBA "Apply for licenses and permits" tool. [S6] (General information, not legal advice — confirm your local requirements.)
Build a portfolio, not a job
Plumbing is the anchor of the multi-trade home-services platform, and it stacks the way route businesses do — along a territory, on customers and dispatch you are already paying for.
It pairs naturally with HVAC, electrical, water treatment and drain cleaning — same customers, same dispatch system, same trucks in the same neighborhoods. The logic is simple: you already have the homeowner's trust and their address, so selling them water treatment or an HVAC service agreement costs almost nothing to win.
Water treatment deserves a word of its own here, because the two trades look like the same business and are not. The pipes really are the same, a treatment system needs a plumbing connection to install, and plumbers sell softeners all the time — so it is reasonable to ask why these are two categories rather than one.
The answer is that they are bought and paid for differently. Plumbing is paid to fix what broke. Water treatment is paid to maintain what works. Plumbing is dispatch work: the phone rings because something failed, and the revenue ends when the repair does. Water treatment is installed-base work: the revenue begins when the install ends and continues on a schedule for as long as the system is in the house.
That difference is why the pairing is worth more than it first appears. Your plumbing call is the access — it puts you in the house and earns the trust. The treatment system is what turns that one visit into a customer who pays you every year without calling. Sell the install off the service call, and you have converted a repair into a subscription.
That is the difference between owning a crew and owning a portfolio. You are not building a plumbing company. You are building the trades vendor a few hundred households call first, anchored by need-based work nobody postpones. A portfolio like that, with a documented customer list and a second licensed name on the payroll, sells to a buyer as one asset — which is how it ends up worth over a million dollars at sale, instead of a van and a license.
Frequently asked questions
Is a plumbing business profitable? It can be, and for a durable reason: the license limits competition and emergency work is not negotiated. Measure it honestly, though — after paying the crew and after paying a supervisor to replace the owner's labor. The test is the dollars left after that, not the percentage on the way there.
How much does it cost to start a plumbing business? Roughly $25,000–$60,000 to start if you hold the license, about $293,000 for a lower-quartile acquisition, or $95,000–$250,000 for a franchise.
Do I need a master plumber license to own a plumbing company? Rules vary by state. Some allow an unlicensed owner if a licensed master plumber is on staff; others do not. This is the single most important question to answer before you buy or start, because it decides which of the three paths is open to you. Check your state licensing board. [S6]
Can I start a plumbing business part-time? If you are already a licensed plumber working for someone else, yes — evenings and weekends are the classic on-ramp. If you are not licensed, the apprentice and journeyman hours come first, and that is the real timeline in this trade.
Where to go from here
Download the free guide.50 Boring Businesses That Make Millionaires is the full result of the research: fifty categories run against the four tests, what each one costs to enter by all three paths, what has to line up for it to work, and how they pair into a portfolio. Free at microbusinessmillionaire.com.
Read the book.The Microbusiness Millionaire: How Ordinary People Build Extraordinary Wealth One Microbusiness at a Time follows four people who each reached a portfolio worth more than a million dollars by a different path. One keeps a hospital job and uses CDFI financing to acquire one stable service business, then another, then a third. One saves on a single income for three years, leaves a master plumber's wage, and stacks trade service lines starting with an SBA microloan. One uses an SBA Community Advantage loan to open a franchise, then opens three more. One starts with about $5,000 on the side and keeps a W-2 for years, building the slowest and most patient version of the same result. Four starting points, four amounts of money, four portfolios worth over a million dollars at sale. The book is coming soon — join the email list at microbusinessmillionaire.com to hear when it lands.
Join the next cohort — Microbusiness Millionaire: Operating System. The book gives you clear examples of how it's done. The course is the step-by-step system for doing it yourself: screening a real company against the four tests, running the owner-replacement cash-flow math on a seller's actual numbers, knowing when to walk, knowing which lenders fund deals this size, and installing the operator who runs the business without you. Eight weeks online, five seats a cohort, waitlist first — at microbusinessmillionaire.com.
About the author
Chris Scott has spent more than twenty-five years in the small-business arena. As the director of a Community Development Financial Institution (CDFI) and as management at the U.S. Small Business Administration (SBA), he saw thousands of business plans and loan applications cross his desk. His research into which microbusinesses build wealth — and which quietly build a job — became The Microbusiness Millionaire and the free companion guide, 50 Boring Businesses That Make Millionaires.
Sources & references
[S1] IBISWorld, Plumbers in the US — Industry Analysis, 2026 ($191.4bn; 3.1% CAGR; ~129,000 businesses). ibisworld.com
[S2] U.S. Bureau of Labor Statistics, Occupational Outlook Handbook: Plumbers, Pipefitters, and Steamfitters (4% projected growth 2024–34; ~44,000 annual openings). bls.gov/ooh
[S3] U.S. Federal Trade Commission, Franchise Rule / FDD Items 7 and 19. ftc.gov. Franchise range shown reflects published Item 7 estimated initial investment for Mr. Rooter (approximately $122,303–$263,800, 2025 FDD) and Benjamin Franklin Plumbing (approximately $143,273–$286,702). Verify the current FDD before relying on either.
[S4] Opportunity Finance Network CDFI Locator (ofn.org); SBA Lender Match (sba.gov).
[S5] U.S. Bureau of Labor Statistics, OEWS, First-Line Supervisors of Construction Trades and Extraction Workers (SOC 47-1011). bls.gov/oes
[S6] U.S. Small Business Administration, Apply for licenses and permits (sba.gov); state plumbing licensing boards.
[Internal]50 Boring Businesses That Make Millionaires — Plumbing entry (tag, three-path entry-cost table, portfolio pairings, framework note), drawn from the author's research and filtered through the underwriting criteria he applied as a CDFI lender.
This article is for general information only and is not legal, financial, tax, or investment advice. Category-level figures are reference points, not a specific-deal projection; individual businesses vary. Consult a CPA, attorney, business broker, franchise consultant, or CDFI loan officer before acting.
Last updated: 8/24/2026.