TL;DR: Most plumbers undercharge because they price to win work, not to make money. To price for profit, you need to know your actual costs — labour, materials, overheads, and your own time — then build a margin on top. A healthy plumbing business should be clearing 30–40% net profit on every job.
Most plumbers are busy and broke. Not because there’s no work, but because they’re pricing jobs to beat the competition rather than pricing to actually make money. The fix isn’t complicated — but it does require a shift in how you think about what a job is worth.
Why Most Plumbers Price Themselves Into Trouble
This is the thing we hear from plumbers across the UK more than almost anything else: “I’m fully booked but I can’t get ahead.” The work is there. The problem is the margin.
The typical mistake is pricing based on what you think the customer will accept, or what a competitor might charge. That’s competing on price — and it’s a race you can’t win. There’s always someone willing to do it cheaper. Usually someone who isn’t making any money either.
Industry data from Q4 2025 shows that 47% of UK plumbing and heating businesses reported falling profit margins — even those with stable or growing workloads. Rising costs for materials, fuel, insurance and van finance are eating into revenue faster than most plumbers realise.
Pricing for profit means starting with what the job needs to cost, not what you hope the customer will accept.
What Does It Actually Cost You to Run a Plumbing Job?
Before you can price correctly, you need to know your real costs. Most sole traders guess at this — and they almost always guess low.
Every job needs to account for:
- Your labour time — including travel, parking, and any time spent quoting or chasing the customer
- Materials and parts — at the price you paid, including any replacements or returns
- Your overheads — van lease or finance, fuel, public liability insurance, tools cover, Gas Safe registration, accountant fees, your mobile phone bill
- Contingency — jobs run over; build in at least 15% on your time estimate
Here’s a simple way to calculate your overhead rate: if your annual business costs — everything except labour and materials — add up to £20,000, and you work around 200 billable days a year, that’s £100 per day in overhead before you’ve picked up a single tool. That amount needs to be in the price of every job you quote, whether you’re spending two hours or two days on site.
Most plumbers who sit down and do this exercise for the first time are surprised by how high the number is.
How to Set a Rate That Actually Makes You Money
The UK average for an experienced plumber in 2026 is £50–£70 per hour, with day rates typically between £325 and £400. London and the South East command a significant premium — £70–£100+ per hour is standard in central London and the surrounding commuter belt.
But the hourly rate alone doesn’t tell the whole story. Here’s how a properly priced job works in practice:
Bathroom tap replacement in Manchester (example):
- Labour: 2 hours at £60/hour = £120
- Materials: £45 (tap and fittings at trade price, supplied by you)
- Materials markup (30%): £13.50
- Total before VAT: £178.50
If you quoted £90 for the same job because you thought that’s what the customer expected, you’ve just worked for well below minimum wage once overheads are factored in.
The target to aim for: 30–40% net profit on every completed job. If a job costs you £120 in real terms — your time and materials at cost — you should be invoicing at least £170–£200.
Hourly Rate vs Fixed Price: Which Works Better for Plumbers?
This comes up constantly on UK plumbing forums and Reddit threads — and the honest answer is that both have a place, depending on the job.
Charge an hourly rate when:
- The scope is unclear or could change significantly once you open things up
- It’s investigative or diagnostic work — tracing a hidden leak, fault-finding on a heating system
- You genuinely can’t estimate the time accurately without doing some of the job first
Quote a fixed price when:
- The job is clearly defined — fit a like-for-like boiler, install a specified shower unit
- You’ve completed similar work many times and can estimate accurately
- The customer needs a firm total before making a decision
Most experienced UK plumbers use a mixture of both depending on the situation. The one thing forum discussions consistently agree on: always charge a minimum call-out fee. In 2026, that’s typically £65–£100 for the first hour, regardless of what you find on arrival. Your time has value from the moment you start the van.
Marking Up Materials: The Profit Most Plumbers Are Missing
If you’re buying parts at trade price and charging the customer that same price, you’re leaving a significant income stream on the table.
The standard markup on plumbing materials in the UK is 20–40% above your trade cost. A fitting that costs you £15 at Toolstation or Screwfix should be invoiced at £18–£21. A bathroom suite that cost you £350 wholesale should be quoted at £455–£490.
This isn’t overcharging — it covers the time you spent sourcing and collecting the parts, the risk of faulty items, and the cost of carrying and transporting materials. Every other trade business does it. The ones that don’t often wonder why their numbers never add up at the end of the month.
Two real examples from UK plumbing businesses:
- A sole trader in Leeds turning over around £85,000 a year switched to a consistent 30% markup on all materials. Without adding a single extra job to his schedule, he added roughly £8,500 to his annual revenue.
- A two-van business in Birmingham moved to fixed-price quoting and introduced a minimum call-out charge across all jobs. Revenue stayed roughly the same. Net profit increased from 12% to 31% within 12 months.
Worried customers will look up part prices online? A clear line in your quote — “all materials sourced, supplied and guaranteed by us” — shifts the framing. You’re not just selling a part; you’re warranting that it works and standing behind it if it doesn’t.
What to Say When a Customer Tells You You’re Too Expensive
It will happen. You quote £375 for a job and the customer comes back to say someone else quoted £210.
The wrong move: drop your price to match.
If someone else can genuinely do that job for £210 and stay in business, either their cost base is very different from yours, or they won’t be trading much longer. Either way, it’s not a comparison worth chasing.
A response that works: “That’s a fair question. My quote covers the materials with a two-year workmanship guarantee, Gas Safe registration, and fully insured work. I’m not able to do the job properly for less — but I’m happy to walk through exactly what’s included.”
Some customers will still go with the cheaper option. That’s fine. The ones who stay are the ones worth having. They’re less likely to haggle on future jobs, more likely to leave a five-star review on Google, and more likely to call you back next time.
If you’re losing more than 20–30% of your quotes on price, the issue is usually how the quote is being presented, not the number itself. A professional quote that includes your Gas Safe number, a clear breakdown of labour and materials, and photos from previous jobs does a lot of the selling before the customer even looks at the total.
For building trust before you get to the quote stage, platforms like Checkatrade and Rated People are useful for verified reviews and credentials — but long-term, your own website and Google presence is what gets you away from competing on price altogether. If you want to understand how that works, this guide to whether Google Ads are worth it for small trades businesses is a useful place to start.
And if you’re serious about growing beyond where you are right now, the same principles apply to how you run the whole business — not just how you price. This piece on getting off the tools and working on the business covers the bigger picture.
Need Help Growing Your Trades Business?
We Are SMC works exclusively with trades and construction businesses across the UK. We handle your Google Ads, SEO, social media and content so you can focus on the work. Get a free 30-minute strategy call at wearesmc.co.uk/get-started — no hard sell, just honest advice.
