“Fungible labour” is a management failure, not a fact about the work

There's a phrase you hear in procurement meetings and on labour-hire spreadsheets: the work is fungible. One operative is the same as another. Book twelve, get twelve, it doesn't matter which twelve.

It isn't true, and anyone who has run a site knows it isn't true. The day one person does the work of three is the day you discover you had no way of knowing that in advance and no way of getting them back next time. Labour looks fungible because we've chosen not to tell people apart. That's a choice, and it's a bad one.

Interchangeable because nobody wrote it down

Take two electricians on the same fit-out, same ticket, same day rate. One finishes the containment on the second floor in three days and it passes first time. The other takes five, and a third of it has to be redone. On the invoice they're identical. In the agency's database they're identical. When the next job comes round, the chance of getting the first one back is exactly the same as the chance of getting the second.

That isn't a fact about electrical work. It's a fact about record-keeping. Nothing about the trade makes those two people the same. Only the paperwork does.

Multiply that across a two-hundred-person job and the gap between the best quarter of the crew and the worst is worth more than most contractors' margin. It sits there, unmeasured, every single week.

What it costs you

If you can't tell the good from the bad, you pay them the same. So you overpay the weakest people on your site and underpay the strongest. The strongest notice first. They leave for someone who pays what they're worth, or they leave the trade. The weakest stay, because nobody else would pay them as much.

Over a few years, that's how a workforce gets steadily worse while the rates stay flat. Contractors call it a skills shortage. Some of it is. Some of it is selection running in the wrong direction, driven by a system that can't see.

There's a safety cost too. A crew of strangers, none of whom has a record, is a crew nobody can vouch for. Supervisors cope by assuming the worst of everyone, which is exhausting and not much safer.

Managing people is the job

In an office, nobody would accept a manager who couldn't say which of their team were strong. On site we accept it every day and call it the nature of the work.

Managing a physical crew means the same things it means anywhere else: noticing what people do, telling them, writing it down, and making decisions on it. It means a short review at the end of each job. It means keeping someone's tickets, passed inspections and repeat bookings somewhere that doesn't vanish when the contract ends. It means maintaining people the way you'd maintain plant: checking their cards are current, spotting what they're ready to learn next, and moving them up when they're ready.

It also means telling people when they aren't good enough, early and plainly, while there's still time to put it right. Crews respect that far more than silence followed by not being asked back.

None of this is complicated. It's just rarely done, because the incentives run the other way. Agencies are paid by the head. Main contractors are paid by the programme. Nobody is paid to remember who was good.

Pay for the difference

The fix is to make the difference visible and then pay for it. Keep a record that travels with the worker. Let the good ones build a reputation that follows them from job to job. Book people by name, not by headcount. And pay more to the person who is worth three, because you'll still be paying less than you would for three.

You don't need a new system to start. Next time a job finishes, write two honest lines about each person on it and keep them. Within a year you'll know more about your workforce than most agencies do.

Fungibility is a story employers tell themselves because it makes the spreadsheet easier. The workers have never believed it. Neither should you.