The honest answer is: more than most plumbers think, and less visible than almost any other business problem.
When you lose a job to a missed call, you don't get an invoice for it. There's no line on your P&L that says “revenue lost to unanswered phone.” The customer just disappears. You're busy. Business feels slow sometimes. You move on.
But that cost is real. Here's how to work it out for your business.
The national picture
A Fix Radio survey of over 220 UK tradespeople found that 60% struggle to answer calls while on site, and 34% know they've lost work as a direct result. One plumber tracked his missed calls for an entire month and calculated £3,920 left on the table — at an average job value of £280.
That's one plumber, one month. And that's only the calls he knew about.
“I didn't even know I was missing that many calls until I saw the data. I just thought business was slow.”
— Plumber, PlumbingZone forum
Calculate your own number
You can get a rough figure in about two minutes. Here's the working:
Example: sole trader plumber, typical week
Adjust those numbers for your situation. If your average job value is higher — say a boiler replacement at £2,000 — a single missed conversion per week is £8,000/month. If you do emergency callouts at a premium rate, the maths gets worse faster.
Why “I'll call them back” doesn't work
The instinct is to call back as soon as you're free. This feels like a reasonable solution. It is not, for three reasons.
First, most callers don't wait. Ofcom data shows 69% of callers won't leave a voicemail — they hang up and call the next number. If someone needs a plumber urgently, they're not sitting by the phone waiting for you to finish your current job.
Second, Harvard Business Review research found that you are 21 times more likely to win the job if you respond within 5 minutes versus 30 minutes. Not twice as likely. Twenty-one times. By the time you're free to call back, you're already behind.
Third, even when people do answer your callback, they may have already booked someone else and feel awkward about it. The conversation is shorter, the energy is lower, and the conversion rate drops.
The comparison site problem
This situation gets harder as comparison sites become more dominant. When a homeowner searches for a plumber in 2026, they often go to Checkatrade, MyBuilder, or Rated People. They don't send an enquiry to one plumber — they send it to three or four simultaneously.
The first tradesperson to respond wins. Not the cheapest. Not the most experienced. The fastest.
If your response to an enquiry is a missed call followed by a callback an hour later, you are at a structural disadvantage against any competitor who has an automated response system — even a basic one.
The cost of £19/month in context
Ringtap costs £19/month. It automatically WhatsApps any missed caller within seconds, qualifies the lead with AI, and sends you a summary when you're free.
Using the numbers above: if it recovers one additional job per month at £280 average value, it returns about 15x its cost. Most plumbers using it see far more than one additional job per month — because they're now competing on response time with larger operations and answering services.
At £3,300/month in lost revenue (the figure we see cited most often for UK plumbers), a £19 tool that recovers even a fraction of that is the highest-ROI line item on your outgoings.
What to do right now
Start by getting a sense of how many calls you're missing. Check your phone's missed call log for the last two weeks. Count the ones you didn't manage to call back within 10 minutes. Multiply by your job conversion rate and average job value.
Most plumbers who do this exercise are surprised by the number.
Then set up call forwarding to Ringtap. It takes 4 minutes. You dial one code on your phone — Ringtap handles everything else. If a call goes unanswered, the caller gets a WhatsApp. You get the lead. The job doesn't disappear.
Stop losing jobs to missed calls
14-day free trial. No credit card. Keep your number. Set up in 4 minutes.
Start free trial →