Construction contractor billing according to VOB - How to calculate?

No, I’m saying that I have a 30m2 difference without having deducted anything.

It sounded like you had deducted everything except for two large windows and the garage door. Just ask him.

Who wrote the specification? It’s usually unusual for the shell builder to specify the quantities; the architect usually includes them in the specification. How else do you want to compare?

The shell constructors have submitted an offer based on the drawing. I was now surprised that I have well over 2000 bricks left, despite having already ordered 1000 bricks less. I then recalculated the surfaces. There was no specification from the architect on our side.

Maybe you at least invest in creating a [LV] for the most expensive single trade. What else does the architect do? ;-)

Who says that there is even an architect on board? Many build without one.

I had an architect who does it on the side. If I had purchased an architectural service according to HOI on a large scale, I might have considered an LV. And what else he does, I unfortunately don’t know, because since the building application and drainage request, luckily there has been no reason to speak with him anymore ;)

Maybe 10% more will be ordered? With tiles, that's the case. After all, there is waste.