About two years ago we had to replace some power supplies at a gaming hall in a network. A location we hadn't built. It took us half a day just to find where the supplies sat in the composite-panel façade — we worked across the boxes until we hit the right panel. The replacement itself, after that, is nothing.
Two light boxes can look identical from the street and have nothing in common behind. One fixed into masonry, the other on a metal structure hidden under the cladding.
It's rarely bad faith. The crew that installed it knew exactly where everything was, and it seemed so obvious they didn't think to write it down. Five years on, those people may no longer be with the company.
What an installation dossier has to answer
This is where the need for the dossier came from. Not photos on the crew leader's phone. The first question it must answer is where everything is: which panel you reach through, where the power supply is, how the cable runs to it, at what height, what has to be taken apart to reach it. That would have saved us that morning.
Then what was actually installed — the as-built dimensions, not the design ones — the material with code and supplier, which modules and from which batch. Without the exact code, four years later you're matching the shade by comparison and it still won't come out right. How it's fixed is what gets lost most often, because it closes up under the cladding and no one sees it again: type of anchor, into what substrate, what was found there when it was opened. A 15 cm external insulation over AAC is documented once, or rediscovered at every intervention.
And everything that changed from the design along the way. That's where the information that matters on the second visit lives, and it's the first to be forgotten.
It costs — and it doesn't solve everything
It costs. A properly documented installation means extra time on site, and the crew won't do it on their own initiative — it has to be requested and checked every time. Across a whole network it adds up.
At ten locations someone may still know every project by heart. At a hundred no one does anymore, and that person leaves at some point anyway, taking with them where the cable runs and why a power supply was moved thirty centimeters to the left.
The dossier stays at the location
The dossier stays at the location, with the unit manager, in the office. We keep a digital duplicate too, because managers change, units relocate, and office files disappear. Every later intervention is recorded in it: who, when, what they changed. After two or three years you have the complete history of the signage there, no matter who wrote it.
The consequence runs both ways. The client isn't tied to us — they can call whoever they want, and that person opens the dossier and finds everything they need, instead of losing the morning the way we lost it at the gaming hall. On the other hand, an intervention done by someone else releases us from responsibility for the execution. We can't guarantee a build another hand has entered and we don't know how. For the same reason we ask that the intervention be recorded in the file even when it wasn't us. It shows anyway, because a seal has to be broken to get inside. Without that line, at the next fault we're again looking at a job we know nothing about.
A damaged element is remanufactured without a new survey, and for an electrical fault you look at the diagram instead of dismantling to find the route.
The difference is paid in travel, not labor
Back to that half day. The job had nothing hard in it. It's just that we knew nothing about it — and the difference between the two is paid in travel, not labor. On a gambling network, with locations scattered across the country, that means long trips and missed appointments, not just a few lost hours.
We also noticed an effect we hadn't anticipated. A crew that knows every fixing is photographed before it's closed up works differently than one convinced no one will ever see again what's under the cladding.
Over time, the dossiers say things memory doesn't. Which anchor held and on what substrate. Where faults show up twice in the same place. That isn't retained as an impression.