How to Read a Plumbing Business P&L (And What the Numbers Are Actually Telling You)

You're running a plumbing business and you've got a P&L sitting in QuickBooks or on your accountant's desk.

You look at it once a month — maybe — and the only number you actually care about is the bottom line.

If it's positive, you feel okay. If it's negative, you panic.

That's not running a business. That's gambling with a spreadsheet.

I've coached over 200 plumbing company owners across North America, and the single biggest financial mistake I see isn't overspending or underpricing — it's not understanding what the P&L is actually telling you until it's too late to do anything about it.

This guide is going to change that. By the end, you'll know exactly how to read every line of your profit and loss statement, what benchmarks to measure yourself against, and which numbers to watch weekly — not monthly — if you want to build a business that actually makes money.

Why Most Plumbing Owners Don't Actually Understand Their P&L

Here's the uncomfortable truth: most plumbing business owners are world-class plumbers who became business owners by accident.

You were great at the trade, you started your own company, and suddenly you're responsible for reading financial statements that nobody ever taught you how to interpret.

Your accountant hands you a P&L once a quarter, you nod along, and you go back to running jobs.

The problem is that by the time you're looking at last quarter's numbers, the damage is already done. You can't fix March's labor costs in June.

Understanding your P&L in real time — and knowing what each line item should look like — is the difference between a business that grows intentionally and one that survives by accident.

The Anatomy of a Plumbing Business P&L

A profit and loss statement has three major sections: Revenue, Cost of Goods Sold (COGS), and Operating Expenses. Let's break each one down in terms that actually make sense for a plumbing company.

1. Revenue: The Top Line

Revenue is every dollar that comes in the door from selling plumbing services and parts.

For a service plumbing company, you'll typically see revenue broken into categories like service calls, drain cleaning, water heater installs, repipes, and new construction if you do that work.

The key metric here isn't just total revenue — it's revenue per technician per day. A well-run plumbing company should be generating $1,200–$1,800 in revenue per tech per day. If you're below $1,000, you have a pricing problem, a booking rate problem, or an average ticket problem — and your P&L will show you which one.

According to data from the Plumbing-Heating-Cooling Contractors Association (PHCC), the top-performing residential service plumbing companies consistently run revenue per tech per day above $1,400.

2. Cost of Goods Sold (COGS): What It Costs to Do the Work

COGS for a plumbing company includes two things: direct labor (your field technicians' wages and payroll taxes) and materials (parts, supplies, and equipment used on jobs).

This is where most owners get confused. They lump everything together — office staff, managers, techs — and can't figure out why their gross margin looks wrong.

For a healthy service plumbing company:

• Direct labor (techs only): 28–32% of revenue
• Materials/parts: 12–18% of revenue
• Total COGS: 40–48% of revenue

That means your gross profit margin should be 52–60%. If it's lower, you're either paying too much for labor, underpricing your jobs, or giving away parts at cost instead of marking them up.

3. Gross Profit: The Number That Actually Matters

Gross profit is Revenue minus COGS. It's the money you have left over after paying for the work itself — before you pay for anything to run the business.

This is the number your entire business runs on. Every dollar of overhead — your office, your trucks, your marketing, your management team — has to come out of gross profit.

If your gross profit margin is below 50%, you are almost certainly not making real money at the bottom line, no matter what your revenue looks like.

I've seen plumbing companies doing $3M in revenue with a 42% gross margin and barely breaking even. And I've seen companies doing $1.2M with a 62% gross margin printing money. Revenue is vanity. Gross margin is sanity.

4. Operating Expenses: Where Profit Goes to Die

Operating expenses — also called overhead — are everything it costs to run your business that isn't directly tied to doing the work.

This includes:

• Owner and management salaries
• CSR and dispatcher wages
• Office rent and utilities
• Vehicle expenses (fuel, maintenance, payments)
• Marketing and advertising
• Software subscriptions (ServiceTitan, Housecall Pro, etc.)
• Professional fees (accountant, attorney)
• Training and development

For a profitable plumbing company, total operating expenses should run 40–48% of revenue.

If your overhead is above 50% of revenue, you have a structural problem that no amount of sales growth will fix. You'll just be running faster on a treadmill that's pointed downhill.

The most common overhead killers I see in plumbing companies are: owner salary that's too high relative to revenue, too many management layers before the company can support them, vehicle payments on trucks that sit idle, and marketing spend with no attribution or ROI tracking.

5. Net Profit: The Bottom Line

Net profit is what's left after you subtract operating expenses from gross profit. This is the number everyone fixates on, but it's actually the last thing you should look at — because by the time you get to net profit, every decision that determined it has already been made.

Benchmark targets for a well-run plumbing company:

• Good: 8–10% net profit margin
• Great: 12–15% net profit margin
• Elite: 18%+ net profit margin

If you're below 8%, you're working hard to stay broke. If you're above 15%, you're running a machine.

The 5 P&L Numbers You Should Review Every Week

Monthly P&L reviews are too slow. By the time you see a problem on a monthly statement, you've already lost 30 days of margin. Here are the five numbers to track weekly:

6. Weekly Revenue vs. Goal

Set a weekly revenue target based on your annual goal divided by 52 weeks. Track it every Friday. If you're consistently below target, the problem is either call volume, booking rate, or average ticket — and you need to know which one before you can fix it.

7. Gross Margin % Week Over Week

Your gross margin percentage should be relatively stable week to week. If it drops suddenly, something changed — a tech is taking too long on jobs, materials costs spiked, or you ran a discount that you shouldn't have. Catch it in week one, not month three.

8. Labor Cost as % of Revenue

This is the single most controllable cost in your business. If a tech is generating $800/day in revenue but costing you $350/day in wages and burden, your labor cost on that tech is 43% — which is a disaster. Track this by technician, not just company-wide.

9. Materials Cost as % of Revenue

If your materials cost is creeping up, it usually means one of three things: your techs are over-ordering and not returning unused parts, your markup on materials has slipped, or you're buying from the wrong suppliers. A 1% improvement in materials cost on a $2M company is $20,000 straight to the bottom line.

10. Owner's Compensation as % of Revenue

This one surprises people. If you're paying yourself $200K on $800K in revenue, your owner compensation is 25% of revenue — which is almost certainly killing your net profit. The benchmark is 8–12% of revenue for owner compensation, with the rest going to profit distributions once the business is healthy.

For a deeper dive into the operational systems that drive these numbers, read our guide on the 8 core systems every $2M+ plumbing company has in place.

How to Use Your P&L to Make Pricing Decisions

Your P&L is the single most important tool for setting and validating your pricing. Here's how to use it:

11. Work Backwards from Your Net Profit Target

Start with what you want to net. If you want $200K in net profit on $1.5M in revenue, that's a 13.3% net margin. Now add your overhead (let's say 42% of revenue = $630K). That means you need $830K in gross profit, which means you need a 55.3% gross margin. Now you know exactly what your pricing has to support.

Most owners price based on what they think the market will bear. The owners who build wealth price based on what their P&L requires.

12. Identify Your Break-Even Point

Your break-even point is the revenue level at which your gross profit exactly covers your overhead. Below that number, you lose money every day you operate. Above it, every dollar of gross profit is net profit.

Formula: Break-even revenue = Total fixed overhead ÷ Gross margin %

If your overhead is $600K and your gross margin is 55%, your break-even is $1.09M. Every dollar above $1.09M in revenue generates $0.55 in net profit. Knowing this number changes how you think about growth, marketing spend, and hiring decisions.

For more on pricing strategy, see our complete guide on plumbing business pricing strategy and flat rate pricing.

Common P&L Mistakes Plumbing Owners Make

13. Mixing Personal and Business Expenses

Running personal expenses through the business — vehicle payments for personal vehicles, meals, travel — distorts every line of your P&L and makes it impossible to know what your business actually costs to run. Clean books are the foundation of every good financial decision.

14. Not Separating Service Revenue from Install Revenue

Service calls and installations have very different labor costs, material costs, and margins. If you blend them together, you can't see which part of your business is profitable and which is dragging you down. Break your revenue into at least three categories: service/repair, installations, and maintenance agreements.

15. Ignoring Owner's Discretionary Earnings (ODE)

If you're thinking about selling your business someday — and you should be — your buyer will look at ODE, not just net profit. ODE adds back owner salary, owner benefits, and non-recurring expenses to net profit to show what the business would earn under a new owner. A business with $150K in net profit but $250K in ODE is worth significantly more than the net profit alone suggests. This matters for your exit strategy.

Building a Simple P&L Dashboard for Your Plumbing Business

You don't need a CFO to track these numbers. You need a simple dashboard — a one-page weekly report that shows you the metrics that matter.

Here's what to include:

• Weekly revenue (actual vs. goal)
• Gross margin % (actual vs. target)
• Labor cost % (actual vs. target)
• Materials cost % (actual vs. target)
• Revenue per tech per day (by technician)
• YTD net profit (actual vs. target)

Review this every Monday morning. It takes 15 minutes. It will tell you more about the health of your business than any quarterly P&L review ever will.

Tools like ServiceTitan and Housecall Pro can generate most of these metrics automatically. Pair them with QuickBooks Online and you have a real-time financial picture of your business.

For more on the KPIs that drive these numbers, read our guide on the 12 KPIs every plumbing owner must track weekly.

Frequently Asked Questions

The Bottom Line on Reading Your Plumbing Business P&L

Your profit and loss statement is not a report card. It's a navigation system.

It tells you where you've been and, if you know how to read it, where you're headed. The plumbing owners who build real wealth — the ones who sell their companies for 3–5x EBITDA and walk away with life-changing money — are the ones who treat their financials like a business tool, not a tax document.

Start with the five weekly numbers. Build your dashboard. Review it every Monday. And if your gross margin is below 55% or your net margin is below 8%, those aren't accounting problems — they're operational problems that need to be fixed at the system level.

That's exactly what we help plumbing owners do at Plumbing Profit Partners™. If you're ready to understand your numbers and build a business that actually makes money, book your complimentary assessment today.