The Hidden Cost of Every Failed Quote (And It’s More Than You Think)

Every time a quote doesn’t convert, you lose money. That much is obvious. But most plumbing and heating engineers massively underestimate how much each lost quote actually costs them. When you see the real numbers, it changes how you think about every single enquiry.

Let’s explore the true cost of a failed quote — and why fixing your conversion rate is one of the fastest ways to grow your bottom line.

The Real Cost Per Quote (It’s Probably Over £160)

Most engineers have never sat down and worked out what it actually costs them to produce a quote. They think of it as “free” because they’re not paying out of pocket. But that thinking is dangerously wrong.

Let’s break it down. A typical boiler quote involves:

• Travel time — 30 to 60 minutes each way, depending on your area
• Survey time — 45 minutes to an hour on site
• Quote preparation — 30 minutes to an hour writing it up, pricing materials, creating the document
• Follow-up time — Calls, messages, chasing (if you bother at all)
• Fuel costs — The miles add up quickly

Add it all together and you’re looking at two to three hours of your time per quote. Now, what’s your time worth? If you’re charging customers £50 to £70 an hour for paid work, that’s £100 to £210 of your time per quote — time you could have spent on billable work.

Factor in fuel, vehicle wear, and the opportunity cost of not being on a paying job, and the true cost of each quote sits comfortably above £160. Some engineers, particularly those covering larger areas, are spending well over £200 per quote.

The Sunk Cost Problem

Here’s what makes this painful. Every one of those costs is sunk whether you win the job or not. You’ve spent the fuel. You’ve spent the time. You’ve done the survey. If the quote doesn’t convert, that money is gone.

Consider this: if you’re quoting ten boiler installs a month and winning four of them, those six failed quotes are costing you nearly £1,000 a month in wasted time and resources. That’s £12,000 a year — gone. Not on tools, not on materials, not on anything productive. Just gone.

And that’s a conservative estimate. If your conversion rate is lower than 40%, the numbers get even uglier.

The Busy Fool Trap

This is where things get really interesting. Some of the busiest engineers I’ve met are also the least profitable. They’re quoting constantly, running from survey to survey, feeling like they’re flat out — but their bank balance doesn’t reflect the effort.

We’ve written about this before in our piece on being busy but not profitable, and the quoting problem sits right at the heart of it.

If you’re doing fifteen surveys a month but only winning five jobs, you’re spending roughly ten days a month on work that generates zero revenue. That’s half your working month wasted on quotes that go nowhere.

The busy fool trap works like this:

• You feel busy, so you assume business is good
• You’re actually spending most of your time quoting, not earning
• Because you’re so busy quoting, you rush your quotes
• Rushed quotes convert poorly
• Poor conversion means you need to quote even more to win enough work
• The cycle accelerates

The answer isn’t to do more quotes. It’s to make each quote count.

Why Boiler Installs Deserve Your Best Effort

Not all work is created equal. A boiler installation is typically the highest-value job a heating engineer does. A single install might be worth £2,500 to £4,500 in revenue, with healthy margins if you price it right.

Compare that to service work at £80 to £120 per visit, or small repairs that might net you £150. Winning one extra boiler install per month could add £30,000 or more to your annual turnover.

And yet, most engineers put the same amount of effort into a boiler quote as they do into texting a price for a tap change. That makes no sense when you look at the numbers. Your highest-value work deserves your highest-quality quoting process.

If you want to understand your overall financial picture better, our guide to profit and loss statements for plumbing businesses is worth a read alongside this.

Conversion Rate Economics: The Numbers That Matter

Let’s put some real numbers to this so you can see the impact of even a small improvement in your conversion rate.

Scenario: 10 boiler quotes per month at an average job value of £3,500

At a 30% conversion rate (3 wins):

• Revenue: £10,500/month
• Quoting cost (10 quotes x £160): £1,600
• Cost per won job: £533

At a 50% conversion rate (5 wins):

• Revenue: £17,500/month
• Quoting cost (10 quotes x £160): £1,600
• Cost per won job: £320

At a 70% conversion rate (7 wins):

• Revenue: £24,500/month
• Quoting cost (10 quotes x £160): £1,600
• Cost per won job: £229

Same number of quotes. Same quoting cost. But the difference between 30% and 70% conversion is an extra £14,000 per month — £168,000 per year. Even moving from 30% to 50% adds £84,000 annually.

This is why conversion rate is arguably the single most important number in your business. Not turnover. Not the number of enquiries. Your conversion rate.

The Flip Side: What Better Quoting Buys You

When your conversion rate improves, everything changes. You need fewer leads to hit the same revenue target. You spend less time quoting and more time earning. Your cost per won job drops, which means your actual profit on each install increases.

But there’s a less obvious benefit too. When you’re winning more work from fewer quotes, you can afford to be more selective about which enquiries you pursue. You can say no to the tyre-kickers and the price-shoppers. You can focus on the jobs you actually want to do, in the areas you want to work, at the prices you want to charge.

That’s a fundamentally different business from one that chases every enquiry because it can’t afford not to. If you’re thinking about growing beyond where you are now, our article on scaling from one van to a fleet covers how profitability needs to come before growth.

What You Can Do Right Now

Start tracking. You can’t improve what you don’t measure. Here are the numbers to record from today:

• Track every quote — Record the date, customer name, job type, quote value, and outcome (won, lost, no response)
• Calculate your conversion rate — Divide jobs won by total quotes issued. Do this monthly
• Work out your cost per quote — Be honest about the time and fuel you’re spending
• Calculate your cost per won job — This is your total quoting cost divided by the number of jobs won
• Set a target — Even a 10% improvement in conversion rate will make a noticeable difference to your bank balance

Once you can see the numbers clearly, the motivation to improve your quoting process becomes obvious. Good job management software can help you track all of this automatically.

Go Deeper With The Quote Handbook

This article gives you the what — the maths, the economics, the wake-up call. But the exact method for slashing your cost per quote and dramatically improving your conversion rate is what The Quote Handbook was built for.

It breaks down the full cost-per-quote calculation for your specific business, shows you where the biggest leaks are, and gives you a proven system to convert more of the quotes you’re already doing. No more quoting into thin air. No more busy fool syndrome.

Grab your copy on Amazon and start turning your quoting time into actual revenue.