Your invoice does not prove you did the work

It lands at 6.40pm, nearly always on a Friday. One line from the client, and it says the visit on the 12th never happened. You open the folder, you have the invoice, you have a job sheet signed by your engineer, you even have the van’s GPS history because the tracker keeps it. Feels like plenty. Then your solicitor asks the one question you were not ready for, which is who signed that job sheet, and the moment you answer that your own lad signed it, the folder gets a lot thinner.

Nobody explains this on the day you register the company, and it should be pinned above the desk. In a dispute the burden sits with whoever asserts the claim, so if you are the one chasing payment, you are the one who has to show what was done and what it was worth. An invoice you raised yourself is not evidence of that. It is a document you wrote about your own work, and the other side knows it. What decides these things is what existed on site while the work was happening, not what you assembled afterwards to defend it.

British construction makes that harsher than most, because of adjudication. Under the Housing Grants, Construction and Regeneration Act 1996 either party can refer a dispute to an adjudicator, and the decision comes back inside twenty eight days. There is no long trial, no parade of witnesses, no chance to reconstruct the story properly. An adjudicator decides on the documents in front of him, in under a month, and the party with contemporaneous records wins almost by default. Whoever turns up with a folder built after the argument started is already behind.

Where this bites hardest

Not every trade carries the same exposure, and the difference has nothing to do with how well the work is done. It is about where the work happens. Make something in a workshop and the thing exists, it can be looked at. When the job consists of having been somewhere that belongs to somebody else, at an hour nobody can reconstruct later, the work evaporates the second your engineer pulls the door shut behind him.

Construction sits at the top, and the numbers have started saying so plainly. TrueScreen, a platform that certifies digital evidence with legal standing, has recorded a 75 per cent rise in requests coming from the construction sector in recent months, and it is not a fashion. The Association of Certified Fraud Examiners puts the growth in fraud cases in the sector at 60 per cent over recent years, while software adoption in construction lags behind the wider economy. Disputes are climbing and the tools to defend against them are arriving late, precisely where they matter most.

Right behind it comes maintenance and building services, for a structural reason. The engineer works inside the client’s premises, often with nobody supervising on behalf of anyone, on call-outs that open and close within the same morning. He writes the job sheet himself, in a hurry, on the bonnet. Then there are service contracts, cleaning in hospitals and schools, manned guarding, logistics, where the client is almost always bigger than you and the specification sets out shift patterns and attendance that somebody will eventually ask you to evidence. And there are the small firms working for landlords and management companies, the most exposed of the lot, because there the contract is often a WhatsApp thread and the proof of having worked lives in a phone.

Practical completion is the real battleground

Something here does run in your favour, and it is worth knowing. Once the work has been taken over and accepted, the position shifts. The party holding the finished work is the party who has to make the case that something is wrong with it, and a client who commissions a survey and itemises defects has, without saying so, conceded that the work was carried out. You cannot credibly argue that nothing was done and in the same breath ask an expert to inspect it.

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Put the two halves together and a rule of conduct falls out. Until acceptance exists, the weight is on you to show what happened and what it was worth. From the moment acceptance exists, the weight moves across. Which means the whole thing is won or lost in that half hour on site, not two years later in front of an adjudicator, and the most important document on the job is not the invoice, it is the confirmation from the person who received the work.

What actually counts as evidence

Evidence that holds has three properties, and none of them is about how tidy the paperwork looks. It comes into existence at the moment the thing happens, not that evening from memory. It cannot be altered by whoever produced it, otherwise it stays a one sided document like the invoice. And the other party can check it independently, without having to take your word. A sheet filled in at the end of the day by your own employee fails all three, and not because the employee is dishonest. The document is structurally weak, that is all.

Part of that infrastructure you are already required to have, for a different reason. The Working Time Regulations 1998 oblige you to keep adequate records showing whether the limits on working time are being complied with, and across Europe the Court of Justice went further in May 2019, ruling in case C-55/18 that member states must require employers to set up an objective, reliable and accessible system for measuring daily working time. Those are the same three words that win a payment dispute. Objective means it does not depend on who fills it in, reliable means it cannot be edited afterwards, accessible means somebody else can read it. If you already run that system for your workforce, you are halfway to having it for your clients, and most firms have not noticed.

In the end the difference is a change of habit rather than a purchase. Hours and photographs are not gathered at month end by reconstruction, they are sealed while the engineer is still standing in front of the distribution board, with verified location attached and a timestamp that is the real one rather than the phone’s. The job sheet closes on site and from that moment nobody can touch it, you included, which is exactly what makes it credible in front of somebody who has to decide. And the client opens a link, checks it, and confirms it himself, with no account and no need to ring you back. That is the job GeoTapp was built to do, and it is not a clocking app with extra features bolted on, it is proof of what your people did, in a shape that survives being challenged.

How many of the disputes you have had in the past three years would have closed in two minutes, if instead of the invoice you could have forwarded the client the confirmation he gave you himself on the day? Tell us in the comments, because these stories all rhyme and every one of them has a different detail in it.

If your work happens on site, start where the problem costs the most, and that is the page on construction.