Wait with the windows until the roofer is finished?

The question is whether he actually has to wait for the roofer before anything else can be done.

Tight would be good, because otherwise moisture gets where it shouldn’t, but many craftsmen also expect that, simply because they don’t feel like working in the rain. However, the roof does not have to be covered. It is already tight because of the foil.

I would rather assume that windows with standard sizes are used and thus are stock items. Custom-made individual production is simply too expensive nowadays.

Thank you!, finally someone here is making a joke specifically for me as a former window manufacturer :)

That is the standard statement for GU/GÜ and probably also for developers, although I am not yet convinced that this is one in this case.
Do you buy the finished work including the land or is it your land, your plans, and a construction company builds it for you (then GU would be the correct term. If you also commissioned the same contractor with the planning, it would be a GÜ, and only if you also buy the land from him is it a developer)?
It was similar for me, except that we installed the windows ourselves and since they had already been delivered, they wanted to get rid of them quickly.
My GÜ denied any possible damage claims if we installed the windows after the underlay membrane. The roofer said nothing would break because they always cut the tiles away from the house – it would just get dusty.
De facto, nothing happened, and I had a hip roof with four ridges (a lot of cutting).

By the way, the claim that windows are not custom-made is nonsense. If you plan your house with DIY store goods, maybe (then you should especially watch the bricklayers closely). Otherwise, the profiles are always custom-made; it’s no problem, the machines can do all that.
Normally, a measurement is taken again even during the shell construction. We didn’t do that because of the delivery time (eight weeks). We could have done it afterward, which would have been good for one window. So we had to chisel bricks nicely at one opening.

So if it’s a developer, you have no chance; he will do his thing however he wants.
If GU/GÜ, release him from window damage caused by roof tiles. Then he might install the windows (if already finished) after the underlay membrane, and then the interior finishing trades could already start.

Thank you. According to your statement, it is a GÜ. The property belongs to me, he does the rest including turnkey planning.

By the way, his reason is that he doesn’t want the windows to break if something falls during the roofer’s work.

He is right about that too!

and thus are stock items.

It has been ages since windows were available as stock items…

Custom-made one-offs are simply too expensive nowadays.

… everything is tailor-made and not more expensive either.

What can you do simultaneously with roofing?

Sampling, relaxing, annoying the forum, hobby. Finally doing something other than thinking about the house ;)