Short answer: on its own, almost never. A photograph proves something existed at a moment. A daywork claim has to prove something else entirely: that the work was instructed, that it fell outside the contract price, and that it took the hours, plant and materials you say it did. A photo speaks to none of those directly.
That does not make photographs worthless. It makes them corroboration rather than proof, and understanding the difference is what separates a daywork account that gets paid from one that gets argued down to nothing.
What actually decides a daywork claim?
Three things, in this order.
First, was it instructed? Daywork is a method of valuing work, not a category of work. Something has to have taken the work outside the original scope: a variation, an instruction, a change in circumstance the contract puts at the employer’s risk. If the work was always in your price, no amount of record keeping turns it into daywork.
Second, was daywork the right basis? Most standard forms treat daywork as a last resort, used where work cannot be properly valued by measurement against rates. If the work could have been measured and priced from the bill, the answer is usually that it should have been.
Third, are the resources evidenced? This is where most claims are won or lost, and it is the only one a photograph helps with at all. You need the hours by trade, the plant on the task, the materials consumed, and a record made at the time rather than reconstructed from an invoice three months later.
Why the signed sheet still matters more than anything
The daywork sheet, submitted at the time and signed by the contract administrator or their representative, remains the strongest evidence in this area. Not because a signature makes the claim valid: a signature usually verifies the resources expended, not the entitlement to be paid on that basis. But it removes the argument that most often kills a claim, which is a dispute about how many people were there and for how long.
Most contracts require sheets to be submitted within a defined period, often at the end of the week following the work. Miss that window repeatedly and you invite the response that the records are unverifiable. Submit on time and the burden shifts.
The refusal to sign is also evidence, and people forget this. If you submit a sheet and it comes back unsigned, or does not come back at all, that fact is worth recording explicitly. A pattern of contemporaneous submissions met with silence looks very different in an adjudication than a pile of unsigned sheets produced at the end of the job.
So what is a photograph actually good for?
A photograph does three useful jobs in a daywork claim, none of which is proving the claim.
It establishes the condition that triggered the work: the obstruction that was not on the drawing, the state of the substrate, the unrecorded service. This is often the single most valuable thing you can capture, because that condition disappears the moment you deal with it and cannot be recreated later.
It corroborates the resource count. A picture of the gang working the task supports a sheet saying four operatives, and undermines the suggestion there were two.
It fixes the date. A photograph carrying its original metadata, in a record that has not been edited, ties the work to a day. That matters more than people expect, because timing is frequently the first thing challenged.
What a photograph cannot do is show instruction, show duration, or show what happened between shots. Two photos an hour apart do not prove an hour of work.
What a defensible daywork record looks like
For each daywork item, aim to hold all of this, created on the day:
- The instruction or the event that took the work out of scope, with who gave it and when. A verbal instruction recorded in writing on the day beats a written one produced afterwards.
- The daywork sheet, submitted within the contractual window, with labour by trade and hours, plant with standing and working time separated, and materials.
- Photographs of the condition before the work, the work in progress, and the finished state.
- The site diary entry for that day, showing the resources on site and what else they were doing, because a daywork claim that cannot be reconciled with the diary invites the argument that the same hours were counted twice.
- The response, or the absence of one.
The reconciliation point is the one most often missed. If your daywork sheet says six operatives on the task all day and your diary shows nine operatives on site in total across four work areas, someone will ask how both can be true. Records that contradict each other are worse than thin records, because they undermine everything else you produce.
The practical problem, and where it actually goes wrong
Almost nobody disputes any of the above. The failure is not one of knowledge, it is that the evidence is created in five places by four people and reassembled by nobody.
The photograph of the unexpected obstruction is on a supervisor’s phone. The instruction was a voice note in the group at 07:40. The sheet is a paper pad in the cabin. The diary, if it exists, was written on Friday for the whole week. Each item might be perfectly good; the claim still fails because nobody can put them in the same place, in date order, eight months later.
That is the reason to treat the group chat as an evidence stream rather than as chatter. It already contains the instruction, the photograph and the timestamp. What it lacks is structure and durability, which is a solvable problem and, notably, not a problem you solve by asking site teams to fill in more forms.
The honest summary
A WhatsApp photo is not enough for a daywork claim, and anyone telling you otherwise is selling something. But a photograph that sits inside a complete daily record, alongside the instruction that triggered the work, the sheet that priced it and the diary that corroborates it, is part of a package that gets paid without an argument.
The photo is not the evidence. It is one line of it. The record is the evidence.
Construction Metric builds that record automatically from the group your site already runs, keeping the original message and photo alongside the structured diary entry: see a sample diary or how it works.