Plot 14 was finished. The plasterer had been through, the ceilings were up, the first fix was buried behind two coats and a skim, and the thing looked like a house. Then the energy assessor asked for the photographs.
There were photographs. Hundreds of them, in a camera roll on a site manager’s phone, somewhere between a delivery note and a picture of his dog. Some were of plot 14. Nobody could say which ones with any confidence, and the wall the assessor needed to see had been closed up in March.
You cannot photograph insulation through plaster.
Why anyone wants a picture of a wall
Part L is the energy section of the Building Regulations — the rules on how much heat a building may lose and how efficiently it heats itself. For years there has been a well-known and slightly embarrassing gap between what a new home is calculated to achieve on paper and what it does once someone moves in. The industry calls it the performance gap. Part of the cause is build quality: insulation specified as full fill that went in as partial, a board that didn’t quite meet the one above it, a service hole nobody sealed.
None of it can be inspected later, because by the time anyone looks it is behind a wall. So the 2021 edition of Part L in England did the obvious thing. It told builders to photograph the work while it was still visible.
The requirement is more specific than people expect. Photographs are needed plot by plot, not site by site — every dwelling needs its own full set. Six things have to be covered: the foundations and ground floor, each main type of external wall, each main type of roof, each type of opening, the airtightness details, and the building services. The pictures must be digital with location enabled, so the file itself carries where and when it was taken, and the file name is meant to say which plot and which detail it shows.
The regulations don’t say who has to hold the camera. In practice that means you. Your site team, on your plots, in the twenty minutes before the boarder covers it up.
What those photographs are quietly holding up
Here is the part that turns a photograph into a cash-flow problem.
Every new home gets an energy calculation, done under a government method called SAP. It runs twice: once at design stage on what you intend to build, and once as-built on what you actually built. The person who does it is an On Construction Domestic Energy Assessor, or OCDEA — an independent assessor qualified to do new-build energy calculations. At the end he signs a compliance report for that plot, called the BREL report: Building Regulations England Part L, with the words knocked into an acronym.
His job is to check that what got built matches what was calculated. Is the insulation the type in the model, or did someone swap it when the merchant let you down? The photographs are how he checks. Without them he is being asked to certify something he cannot see.
The BREL report and the photographs then go to the building control body and to the building owner, and building control needs them before issuing the completion certificate for that plot. The same as-built assessment produces the EPC that goes to the buyer. So the chain runs: no photograph, no signed report, no completion certificate. And a buyer’s solicitor will want that certificate before anybody exchanges.
A missing picture of a cavity you built perfectly well is now sitting between you and the money.
This is a filing problem wearing a compliance costume
Nobody fails this because they don’t care. They fail it because a camera roll is not a filing system.
The photograph usually gets taken. That is the strange part. A site manager told to photograph the insulation will photograph the insulation. Then it sits in his phone with four thousand others, or it goes to the office on WhatsApp, which compresses the image and strips out the location and time data that made it evidence. Months later someone is asked whether a picture of some mineral wool is plot 14 or plot 41, and the honest answer is that it could be either.
The deeper problem is that nobody sees the hole while it is still fillable. The moment to notice that plot 14 has no photograph of its wall insulation is the week the wall is open. Instead you find out in October, from an assessor, about a plot finished in June, on a phone belonging to a site manager who left in August.
What actually fixes it
Something very small. A list of plots. Against each plot, the set of shots it needs. The camera lives inside the tool, so a photograph is filed against a plot and a detail the moment it is taken and cannot end up anywhere else. And one screen showing which plots are missing which pictures — so the gap is visible in the week it can be closed, not the month it can’t.
That is the whole thing. Notice what it isn’t. It isn’t a document management system, and it certainly isn’t one of those site platforms with a snagging module and a dashboard for a board meeting you don’t hold. One tool, one job: making sure the evidence exists while creating it is still physically possible.
It is also about to get heavier. The Future Homes Standard was published on 24 March 2026 and comes into force on 24 March 2027, with a twelve-month transitional period after that for work already under way. In plain terms, new homes with a heat pump and solar panels instead of a gas boiler. More equipment, in the category that already has the most kit in it, on every plot you build.
Where this doesn’t apply
If you don’t build new dwellings, none of this is yours. Commercial fit-out, refurbishment, groundworks, civils — different paperwork, different headaches, ignore the lot of it.
And if you put up six houses a year, one person handles the photographs with a naming convention and a shared folder, and your assessor has never had to chase you, leave it well alone. A diligent person beats software at that scale every time. This only earns its keep once enough plots are running at once that nobody can hold the state of them in their head.
But if you have ever had a plot sit finished and sold and unable to complete over a photograph of a wall you built correctly in the first place — that is not a discipline problem. It is a missing tool. Get in touch.