The Silent Margin Killer: Why Engineers Do Unpaid Work

Commusoft

Xero

QuickBooks

Stripe

The job does not end when you pack the van

The second shift: the admin that starts after the van is packed.

Ask any engineer when their working day finishes and they will tell you the time they left the last job. Ask their partner and you will get a different answer. The real day ends later, at the kitchen table, with a laptop and a cold cup of tea, writing up the quote for tomorrow and filling in the certificate from today.

I have spent twenty years building software for field service businesses. In that time I have looked at the numbers behind thousands of trade companies. The pattern is always the same. The revenue is generated on site, by the person holding the tools. Everything else is cost. And a huge slice of that cost is work your team does for nothing, in their own time, on every job you run.

Nobody decided to run the business this way. It crept in. One free bit of advice here, one quote written on a Sunday there, one invoice chased twice before it got paid. On its own each one is trivial. Stacked up across a year, across a team, it is the difference between a healthy margin and wondering where the money went.

That is why I call it the silent margin killer. It is silent because it never appears on a job sheet. You cannot see it in your accounts. But it is there on every job, and it is coming straight out of your profit.

What "unpaid work" actually means on a job

When people hear "unpaid work" they think of the customer who never paid. That happens, and it hurts, but it is not the main problem. The main problem is the work that was never going to be paid for because nobody ever priced it in.

Walk through a normal job and count the unbilled minutes. The enquiry call. The drive to site to take a look before you can even quote. The quote itself. The follow-up chase when the customer goes quiet. Ordering the materials. The second trip to the merchant because one fitting was missing. Writing up the certificate. Raising the invoice. Chasing the invoice. Answering the "quick question" three weeks later. None of it is on the clock.

Here is roughly where the hours go on a typical domestic job. Your split will differ, but the shape rarely does.

Add the "no" and "rarely" rows together and you are often looking at two hours of unpaid work wrapped around a job that billed for three. That is not a rounding error. That is your margin.

The maths nobody runs

The numbers are not hard. Most businesses just never run them.

The surveys back up what the job sheets hide. The UK Admin Drain Report 2026 found the average small trades business loses around eight hours every week to repetitive admin, which works out at 384 hours a year. Another study put the paperwork burden at seven hours a week, or up to 48 working days a year gone.

Simply Business surveyed 408 UK tradespeople in 2026 and found that 92 per cent had been asked to take on extra work beyond the original booking, and 34 per cent were paid nothing at all for it. The out-of-scope favours alone added up to around £2,600 a year per person. That is a fortnight's wages you are giving away one "while you are here, mate" at a time.

Now put a rate on it. Take a modest £30 an hour and eight hours a week of admin. That is £240 a week, or roughly £12,000 a year, per person, spent on work that generates no invoice. For a five-van outfit you are into serious money. The goal is simple: you want that time either paid for or given back to the tools.

I wrote recently about how most field service businesses know their revenue but not which jobs actually make money. This is the same problem seen from the other end. If you do not know what your admin costs, you do not know what your jobs cost, and if you do not know what your jobs cost, your margin is a guess.

Why the back office stays invisible

In most trades businesses the technician on site is the revenue generator and the back office is the cost centre. That is not a criticism of the office. It is just the shape of the thing. The problem is that the cost centre is where most of the unpaid work lives, and cost centres are easy to ignore until they are out of control.

The office does not send an invoice for the two hours it spent chasing three late payers. The engineer does not log the evening they spent writing quotes. So the cost never gets measured, and what does not get measured does not get managed. You end up with a business that is busy, turning over decent money, and somehow not as profitable as it should be. Nine times out of ten, this is where the money went.

None of this means hiring more office staff. Adding people to a cost centre is how you make a cost centre bigger. The answer is to get the admin off human hands wherever you can, so the people you do employ are spending their time on work that actually moves the needle.

The quote that never converts

Every quote costs you time. Only some of them ever pay you back.

Quoting is the purest example of unpaid work in the trade. More than a third of tradespeople spend over twenty minutes writing a single quote from scratch. Do six to ten a week and that is two to three hours gone, on documents that might never turn into paid work. Win one in three and you have paid for three quotes to get one job. The other two came straight out of your evenings.

An electrician on the MikeHolt forum described it perfectly. He put a big chunk of time into a detailed quote, did not win the job, and only realised afterwards how much he had sunk into it. "This was definitely a boiling a frog situation," he wrote. "I didn't realise how much time I was going to put into this quote until after I had already put it all in." That is the trap. No single quote feels expensive. The habit is what bleeds you.

There are two honest ways out, and they are not mutually exclusive. The first is to charge for detailed design and quoting work on complex jobs, and credit it back if the customer proceeds. Plenty of good firms already do this. The second is to make quoting so fast that its cost drops to near enough nothing. A quote you can build on your phone before you have left the driveway is a completely different animal to one you dread all week and finally force out on a Sunday night.

Chasing money you have already earned

Ask a room of trade owners which task they would automate first and the answer comes back before you have finished the question: invoicing and chasing payment. It wins every time, by a mile. It is the work everyone hates most, because you are spending unpaid time to collect money you have already earned.

Late payment is not a moral failing on the customer's part, it is just how cash behaves when nobody makes it move. The tradesperson who has to phone twice, email once and text again to get a £400 invoice settled has spent the best part of an hour recovering money that was always theirs. Do that across a month and you have a part-time debt collector on the payroll who happens to also be your best engineer.

This is where getting paid automatically changes the game. Set a customer up on direct debit once and the collection runs itself on the right day, with nothing for you to chase. Payment tools such as Stripe and open-banking direct debit, feeding straight into your accounts package in Xero or QuickBooks, take the whole chore off your hands. Businesses that automate collection and reconciliation report spending well over half less time on payment admin.

I have made this same argument to heat pump installers, who lose two to three hours per job to certification and grant paperwork on top of everything else. If you fit renewables, the admin tax is even heavier, and the case for automating it is even stronger. Getting a grip on the paperwork buried in every heat pump job is worth real money.

Stop doing it for free: a practical fix

The aim is simple: more time on the tools, less time on the paperwork that follows.

You will never get unpaid work to zero. Some of it is the cost of being in business, and a bit of goodwill is what gets you recommended. The Simply Business research found that the tradespeople who helped beyond the original job often won referrals and better reviews off the back of it. So the aim is not to become the person who charges for every phone call. The aim is to be deliberate about it instead of bleeding time by accident.

Here is the order I would work through it.

1. Measure it first. For two weeks, get everyone to jot down the admin and unbilled time they actually do. Quotes, chasing, merchant runs, write-ups, the lot. You cannot fix a number you have never seen, and the number is almost always bigger than anyone guesses.

2. Price the unavoidable bits in. If a job type always needs a pre-visit and a detailed quote, that time is a real cost of doing that work. Build it into your rate. You are not adding a fee, you are stopping yourself from working the first hour of every job for free.

3. Cut the pure waste. Second merchant runs, jobs booked with half the information, quotes written three times because the details kept changing. A lot of unpaid work is just friction, and friction is fixable with a tighter process before it ever needs software.

4. Automate the repeatable. Quoting, certificates, invoicing, payment collection, appointment reminders and rebooking are all rules-based and repetitive. This is exactly the work that job management software and payment tools are built to swallow. AI is everywhere right now, and it is overhyped, but automating the boring, repeatable admin is the part that already pays for itself today.

5. Give the time back on purpose. Time you claw back from admin should go somewhere deliberate: onto the tools earning, into better quotes that win more work, or home to your family. If you win back ten hours a week and immediately fill them with more admin, you have missed the point.

If van and travel time is your biggest unpaid drain rather than office work, that is a different lever with the same logic. I have written separately on whether fleet tracking actually saves money once you run the real numbers.

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