What late material actually costs

Ask a site manager what it cost when the roof covering arrived two weeks late. Usually the answer is “nothing, the supplier delivered in the end”. The invoice matches, the price is the same as the quote, there is nothing to claim.

And yet the money went somewhere. It just never got added up into a single line.

Where the loss hides

A crew standing idle. The roofers were due on Monday. The material did not arrive, so they came two weeks later — except by then they had taken another job, and turned up after three. If they are subcontractors you do not pay for their downtime. You pay for it elsewhere: in the completion date.

Phases that jam up behind each other. The roof blocks the electrics, the electrics block the plastering, the plastering blocks the floors. Two weeks at the start of the chain are not two weeks at the end. They are usually three or four, because every following trade has its own calendar and will not show up exactly when it suits you.

A half-built house costs money even when nothing happens on it. The loan runs, the fencing is rented, the crane is rented. Material that arrived but cannot be installed sits in storage, and somebody is liable for it.

Handover pushed into winter. This is the expensive one. A project due in October gets finished in January — except render and screed cannot be laid below five degrees, so you wait for spring. Two weeks in spring turned into four months.

Why you cannot work it out afterwards

Try establishing, six months on, exactly when you requested a quote for that roof covering. The answer sits in one person’s inbox. When did the supplier reply? Somewhere in the thread. When did you order? Possibly by phone, so nowhere at all.

Without those four dates — requested, ordered, in stock, installed — a delay cannot even be described, let alone prevented. So the company stops looking for the cause and starts looking for someone to blame. And since it never finds them, the same thing happens next time.

What can actually be done

This does not need a complicated system. It needs those four dates filled in for every item on every project — and filled in as work happens, not reconstructed later while hunting for a culprit.

Once that data exists, two things happen by themselves:

Delays become visible while you can still act on them. An item that should be ordered and is not can be ordered today. An item discovered during a December audit cannot.

The chain can be read forwards. When the roof starts in nine days and the covering has no quote request, nobody needs to hold that in their head. It surfaces on its own.

And one uncomfortable point

None of this is solved by buying software. It is solved by people filling the data in — and they will only do that if filling it in is faster than digging through email.

That is why in Materia an item’s status is derived from the dates rather than the other way round. Nobody records a status on top of their work. They enter a date they needed anyway, and the status moves itself.