Hello everyone,
thank you very much for all the responses.
The contract does not specify exactly whether it is according to the Building Code or VOB. I assume that it is then the Building Code.
In our individual calculation, there is always a distinction between material and assembly. However, in the payment schedule, there is no longer any distinction; it simply lists amounts and topics (e.g. windows, shell components, shell acceptance, etc.)
The provider told me that companies sometimes only start working when the money is in the account (which seems even stranger to me). After delivery and service, he could also do it then, but he would get worse prices; however, since I have a fixed price, that is actually not my problem.
Since I am strongly dependent on the provider and I do not want to jeopardize the further relationship as the construction progress might possibly be at risk, I am in a kind of dilemma...
Nevertheless, I certainly will not simply pay any amount greater than 20k in advance.
Best regards