How to Price Your Plumbing & Heating Jobs for Profit (Not Just Survival)

There is a question I hear more often than any other from plumbing and heating engineers: “Am I charging enough?” The answer, almost every time, is no. Not even close.

Pricing is the single biggest lever in your business. Get it wrong and you will work fifty-hour weeks, drive a van that is falling apart, and still wonder where all the money went. Get it right and the same number of jobs puts real profit in your pocket.

This is not about ripping customers off. It is about understanding what your work actually costs, what it is genuinely worth, and quoting with confidence instead of crossing your fingers and hoping for the best.

Why Most Plumbers Undercharge (And the Mindset Shift You Need)

Let’s be honest. Most engineers set their prices the same way: they look at what the bloke down the road charges and match it. Or worse, undercut it.

That is a race to the bottom. And there is only one winner in a race to the bottom — the customer who gets cheap work from someone who cannot afford to stay in business long enough to honour their guarantee.

The Three Reasons You Are Probably Too Cheap

1. Fear of losing the job. You think if you quote higher, the customer will go elsewhere. Sometimes they will. But the customers who only buy on price are the ones who haggle, complain, and leave you a bad review anyway. They are not your people.

2. You do not know your true costs. Most engineers know what a boiler costs from the merchant. Very few know what it actually costs them to turn up, fit it, and drive away. Once you add the van, fuel, insurance, tools, Gas Safe renewal, training, software, phone, accountant fees, and your own wage — the number is eye-opening.

3. You confuse turnover with profit. Bringing in £80,000 a year sounds great until you realise £65,000 of it went on costs. That leaves £15,000 — less than minimum wage for all those hours. If this sounds familiar, your pricing needs surgery, not a plaster. For more on understanding what is actually left at the end of each month, have a look at our guide on profit margins for trades businesses.

The mindset shift is this: you are not selling hours, you are selling outcomes. A customer does not pay you for six hours of your time. They pay you for a warm house, a working bathroom, or the peace of mind that comes from knowing a Gas Safe registered engineer has done the job properly.

Cost-Plus Pricing vs Value Pricing: What Is the Difference?

There are two main approaches to pricing your work. Most plumbers use the first. The profitable ones use the second.

Cost-Plus Pricing

This is the simple method. You add up the cost of materials, add your labour time at a set hourly rate, and maybe stick a percentage on top for profit.

Example: A bathroom tap replacement might look like this — £45 for the taps, 1.5 hours at £40/hour = £60, plus 10% margin = £11.50. Total quote: £116.50.

The problem? Your £40/hour rate probably does not cover your real overheads. And a flat percentage margin does not account for the value you are delivering.

Value Pricing

Value pricing starts from the customer’s perspective. What is the outcome worth to them?

Same example, different thinking: The customer has a dripping tap that is keeping them awake, damaging their cabinet, and wasting water. A quick, professional fix with quality parts and a 12-month guarantee? That is worth £160-£180 to most homeowners. You have not changed the work — you have changed the framing.

Consider this: a locksmith who opens your front door at 11pm does not charge you for the thirty seconds it takes to pick the lock. They charge you for knowing how to do it, being available when you need them, and the relief of getting back into your own home. Your trade works the same way.

How to Calculate Your True Hourly Rate

Before you can price anything properly, you need to know what it actually costs you to operate. Not roughly. Precisely.

Here is a realistic breakdown for a sole trader plumbing and heating engineer. Adjust the figures to match your own situation, but do not kid yourself that your costs are lower than they are.

Now let’s work out what that means per hour. If you work 46 weeks a year (allowing for holidays, sickness, and the odd quiet spell) and bill for 6 productive hours a day, 5 days a week, that gives you 1,380 billable hours.

£17,450 ÷ 1,380 hours = £12.64 per hour just to cover your overheads — before you have paid yourself a penny or bought a single fitting.

If you want to take home £40,000 a year, you need to add another £28.99 per hour (£40,000 ÷ 1,380). That puts your minimum hourly rate at £41.63 before any materials or profit margin.

Still think £35 an hour covers it? It does not. If you are unsure whether your business structure is costing you more than it should, our article on sole trader vs limited company is worth a read.

Worked Example: Pricing a Boiler Installation Properly

Let’s put this into practice with a job every heating engineer knows well — a straightforward combi boiler swap.

The Numbers

That £2,345 is your minimum. Not your ceiling. If the job involves extra complexity — repositioning the boiler, running a longer flue, working in a tight loft space — your quote goes up accordingly.

Too many engineers would quote this job at £1,800-£2,000 because that is “what everyone charges.” But at £1,800, with £1,525 in materials and £429 in labour and costs, you are making a loss. You would literally be paying the customer for the privilege of fitting their boiler.

Your Quote Should Never Just Be About the Boiler

Here is where the real profit lives. A boiler installation is not just a box on a wall. It is the start of a relationship with that customer.

Think about what happens after you fit the boiler. The manufacturer warranty needs registering. The system needs a service every year. Things go wrong — a pressure drop, a fault code, a thermostat that stops talking to the boiler.

If you walk away after the install, you leave money on the table. Worse, you leave the door open for another engineer to pick up that customer and all the future revenue that comes with them.

What You Should Be Selling Alongside Every Installation

• Annual service plans — guaranteed recurring income for you, peace of mind for the customer
• Extended warranties — beyond the manufacturer’s standard cover
• Priority callout agreements — customers pay a small premium to jump the queue when something breaks in January
• Smart thermostat setup and support — an easy upsell that customers genuinely appreciate

Each of these adds value for the customer and profit for you. A £12/month service plan does not sound like much, but across 100 customers that is £14,400 a year in recurring revenue before you have picked up a spanner. That kind of consistent income transforms your cash flow.

How Tiered Pricing Works: Good, Better, Best

If you have ever bought a phone contract, you have seen tiered pricing in action. Three options. The cheap one that feels like it is missing something. The expensive one that is more than you need. And the middle one that feels just right.

You can do exactly the same with your quotes. In my eyes, this is one of the most effective pricing strategies a trades business can adopt. Let’s explore how it works for that boiler installation.

Example: Three-Tier Boiler Installation Quote

Package 1 — Standard (The “Good” Option): £2,345

• New combi boiler installed
• Magnetic filter fitted
• System flush
• Manufacturer warranty registered
• Building regulations notification

Package 2 — Complete (The “Better” Option): £2,795

• Everything in Standard, plus:
• Smart thermostat supplied and installed
• 12-month service plan included
• Priority callout for the first year

Package 3 — Premium (The “Best” Option): £3,295

• Everything in Complete, plus:
• Extended 5-year parts and labour warranty
• Annual service for 3 years included
• 24-hour emergency callout cover
• Free annual boiler health check

Here is why this works. Most customers will pick the middle option. It feels like the best balance of value and price. But notice something — your “Standard” package is the price you should have been charging all along. The middle and top tiers are pure additional profit.

Even if only half your customers upgrade from Standard to Complete, that is an extra £450 per job. Do 100 installations a year and you have just added £22,500 to your annual revenue — for work you were going to do anyway.

The Compound Effect of Better Pricing

Small pricing improvements create enormous results over a year. This is not theory. It is basic arithmetic.

Let’s say you do 200 jobs a year (a mix of installations, repairs, and servicing). If you increase your average price by just £200 per job — whether through better base pricing, service plan add-ons, or tiered quotes — that is:

£200 × 200 jobs = £40,000 extra per year.

Not extra turnover. Extra profit. Because most of that £200 is margin, not cost.

What does £40,000 look like in real terms? It is the difference between a clapped-out van and a new one. Between working Saturdays and spending them with your family. Between surviving and actually building something.

And here is the thing — you do not need a single extra customer to make it happen. Same jobs. Same hours. Better pricing.

How to Put This Into Practice

Knowing you need to charge more is one thing. Actually doing it is another. Here are five steps to start this week.

1. Work out your real numbers. Use the overhead table above as a starting point. Be honest. Include everything. If you are not sure what you are spending, your accounting records will tell you — and if they will not, that is a separate problem to fix.

2. Set a minimum hourly rate that actually works. Below that number, you do not take the job. Full stop. Walking away from work that loses you money is not turning down business — it is protecting your business.

3. Build tiered quotes for your most common jobs. Start with boiler installs and bathroom refits. Create three clear packages and present them on a professional-looking quote document.

4. Add at least one recurring revenue element to every job. A service plan, a maintenance agreement, a check-up schedule. Something that brings the customer back and keeps the money flowing. For more on why consistent income matters, read our piece on managing cash flow in a trades business.

5. Review your pricing every quarter. Costs go up. Fuel goes up. Materials go up. If your prices stay the same, your profit shrinks. Treat your price list like a living document, not something carved in stone.

If you want to go deeper on this, I wrote The Quote Handbook specifically for trades businesses that want to stop guessing and start pricing with confidence. It walks you through the whole process — from understanding your costs to presenting quotes that win work at the right price. It is available on Amazon and it is the resource I wish I could hand to every plumber and heating engineer who tells me they are “too busy to be broke.”

The Link Between Pricing and Your Accountant

Here is something most engineers do not think about: your accountant should not just be someone who files your tax return once a year. They should be someone who understands your pricing, your margins, and where your money actually goes.

When your books are accurate and up to date, you can see exactly what each type of job earns you. You can spot which work is profitable and which is quietly bleeding you dry. You can make decisions based on facts instead of gut feeling.

Proper pricing starts with proper numbers. If your accountant is not talking to you about your margins, your overheads, and your pricing strategy — you have got a tax preparer, not a business partner.

At Together We Count, this is exactly what we do. We work with plumbing and heating businesses across Sheffield and beyond, helping them understand their numbers so they can make better decisions about pricing, growth, and profitability. It is not about spreadsheets for the sake of spreadsheets. It is about giving you the clarity to charge what your work is worth and keep more of what you earn.

The Bottom Line

You did not get into plumbing and heating to work for free. But if you are not pricing your jobs properly — accounting for every overhead, building in real profit, and offering tiered options that increase your average job value — that is effectively what you are doing.

The good news is that fixing it does not require more customers, more hours, or more stress. It requires better numbers, clearer thinking, and the confidence to charge what you are worth.

Start with your overheads. Calculate your true hourly rate. Build three-tier quotes for your biggest jobs. And get an accountant who actually helps you understand what is going on in your business.

Want to understand your numbers better? Let’s talk about how the right financial setup supports profitable pricing.