Most “business plan” advice is written for people raising money from investors. You’re a plumber starting a service company. You don’t need a 40-page document with market analysis charts. You need a tight plan that answers a few questions clearly so you don’t go broke in your first year.

A good plumbing business plan does two jobs: it forces you to do the math before you spend your savings, and it gives you something to hand a bank if you ever want a loan or a line of credit. That’s it.

Here’s exactly what to put in it, section by section, in plain English.

Why You Actually Need One

Skipping the plan is how plumbers end up six months in, working 60-hour weeks, and somehow making less than they did as an employee. The plan catches that before it happens. It makes you confront your real costs and your real pricing on paper, where mistakes are free, instead of in real life, where they’re expensive.

If you only write one number down, make it your monthly break-even. More on that below.

Section 1: The One-Paragraph Summary

Write a single paragraph that says who you are, what you do, where, and for whom. Example:

“[Your Name] Plumbing is a licensed residential service plumbing company serving the greater [City] area. We focus on repair, water heater replacement, and re-pipes for homeowners, with same-day service and upfront flat-rate pricing.”

That’s your whole business in three sentences. If you can’t write it clearly, you haven’t decided what your business is yet. Decide now.

Section 2: Services and Focus

List what you’ll actually do, and just as important, what you won’t. New owners try to be everything to everyone and end up unfocused.

Pick your lane:

• Residential service & repair — leaks, clogs, water heaters, fixtures. High volume, fast cash, lots of small jobs. Great for solo starts.
• Repipes and remodels — bigger tickets, fewer jobs, needs more coordination.
• New construction — steady work through builders, but slow pay and thin margins.
• Commercial — bigger contracts, more red tape, longer payment terms.

Most solo plumbers should start with residential service. The jobs are small, you get paid same-day, and you don’t need a crew. You can expand later.

Section 3: Your Market and Customer

You don’t need a fancy market study. Answer three questions:

1. Who’s your customer? Homeowners 35-65 in your service radius is the typical answer for residential service.
2. How big is your service area? Define the radius you’ll drive. Too wide and you waste hours in the truck. Usually 20-30 minutes from home base.
3. Who else is out there? Search “plumber near me” in your town. Look at the top results, their review counts, their pricing if you can find it. That’s your competition. Note where they’re weak (slow response, bad reviews, no upfront pricing) and that becomes your angle.

Section 4: Pricing Model

This is the section that makes or breaks you. Decide how you’ll charge:

• Flat-rate — a set price per job. Customers love it, rewards efficiency, standard for residential service.
• Time and materials — hourly plus parts. Simpler but punishes you for being fast.

Then set your actual shop rate. Here’s the reality most new owners miss: your billable rate has to cover way more than your old hourly wage. It covers insurance, the van, fuel, taxes, your phone, slow days, AND profit.

Rule of thumb: you can realistically bill maybe 25-30 hours a week, not 40, once you account for drive time, estimates, and paperwork. So if you need to gross $6,000/month and you bill 110 hours a month, your minimum rate is about $55/hour just to break even, before profit. That’s why real shop rates are $120-$200+/hour. We go deeper on this in our guide to starting a plumbing business.

Section 5: Startup Costs

List every dollar you need to open the doors. Don’t guess, itemize:

• License and exam fees
• LLC formation
• Insurance (first payment) and bond premium
• Van (if you need one)
• Van shelving and wrap
• Tools and starting inventory
• Phone, software, payment processing setup
• Website and Google Business Profile setup
• A cash cushion for slow first months

For most solo plumbers this lands between $8,000 and $25,000. We break out every line item in how much it costs to start a plumbing business.

Section 6: The Money Section (Do This Math)

Three numbers run your whole business. Get these right and the plan basically writes itself.

Monthly fixed costs. Everything you pay whether the phone rings or not: insurance, software, phone, loan payments, your own salary. Add it up.

Average profit per job. Your average ticket minus the parts and direct costs on it.

Break-even job count. Fixed costs divided by profit per job = how many jobs you must do each month just to keep the lights on.

Example:
– Fixed costs: $5,000/month
– Average profit per job: $250
– Break-even = 20 jobs/month, or about 5 jobs a week

Now you know your target. Anything above 20 jobs is profit. Anything below and you’re losing money. That single calculation is worth more than the entire rest of the plan.

Section 7: Marketing Plan

Keep it simple and prioritized:

1. Google Business Profile — free, your #1 lead source. Fully complete it.
2. Reviews — ask every happy customer, every time.
3. A one-page website — who, what, where, big phone number.
4. Referral relationships — other trades, realtors, property managers.

Paid ads come later, once the free channels are working.

Section 8: Goals and Milestones

Set three or four concrete targets for year one:

• “20 jobs/month by month 3”
• “30 Google reviews by month 6”
• “Hire first helper by month 9”
• “$120K revenue by end of year one”

Goals you can measure keep you honest.

A Template Beats a Blank Page

Staring at a blank document is where most plans die. That’s why the Plumbing Starter Kit includes a ready-to-use business plan template with every section above already laid out, plus a startup budget calculator and pricing calculator that do the math for you. You fill in your numbers, it tells you your break-even and your minimum rate.

You shouldn’t have to be a finance person to start a plumbing business. The kit handles the business side so you can focus on the work.

Get the Plumbing Starter Kit →

Plan it once, build it right, and never wonder if you’re actually making money.