How many window sills are there in total?
I just read a bit about it on the internet. Everywhere it said that normally an overhang of 2-5cm is done, so your 8-10cm is certainly not the usual measure. I would definitely insist that they be removed again! You also can't really use the space behind it, for example, we have a printer directly behind the windowsill, when walking you have to make a curve around the window. You can't just make any arbitrary overhang and then expect the customer to be satisfied with it. We had a small color difference on one windowsill, the site manager immediately had the windowsill replaced even though the interior plaster was already finished. It was done quickly without damaging the plaster, so it's no big deal.
Best regards
Sabine
So: It was not explicitly discussed here either. However, we had a selection appointment with BU beforehand, where he showed us the benches. There we chose a model and already saw that they are rather narrow. That was all. Karsten