What is the value of a fixed price that is not guaranteed?

In our contract for work, an extension of construction time due to Corona is expressly excluded. The BU stated very clearly that the industry was one of the few that continued to work normally even during the Corona crisis.

Which BU is that? It would be very interesting.

Layman’s opinion: if the contract is signed BEFORE the C-crisis, then the BU can apply force majeure. New contracts with fixed prices should work normally again with common general terms and conditions. I’ll put it this way: no one is forced to sign contracts. If you don’t like certain points, you just don’t sign and go to another general contractor. But if someone signs it for whatever reason (e.g. time), they have to live with what they signed. Because you can also ask in reverse: what does a customer-signed contract mean for the general contractor if they don’t want to abide by it because they doubt it?

Lay opinion: if the contract was signed BEFORE the C-crisis, then the BU can invoke force majeure.
New contracts with fixed prices should again work normally with common GTCs.
I'll put it this way: you are not forced to sign contracts. If you don't like some points, you just don't do it and go to another GU.
But whoever does so for whatever reasons (e.g. time), must live with what he signs.
Because one can also ask in the reverse sense: what does a contract signed by the customer mean for the GU if he does not want to comply with it because he doubts it?

You mean it will be different with others?:mad:
So it is not the rule that such things are done?

And what do you mean by the "reverse sense"?
Something like "Poor contractor, who has such a criminal customer who actually has questions, no, even doubts before signing the contract – and thus announces that he does not want to abide by the contract"?o_O

Poor entrepreneur who has such a criminal customer, who actually has questions, no, even doubts before signing the contract - and thus announces that he does not want to adhere to the contract"?o_O

You didn’t say anything about questions. Stay factual: you either sign a contract or you don’t. If one clause or several points cause doubts, then you negotiate them away or you don’t sign and try somewhere else, or you sign but do not complain. You choose the entrepreneur after all. He will or should build your house - so he won’t be your enemy or executioner. He will be your partner! And yes: I am convinced that there are housebuilding companies that do not include these points, but instead have clearly raised the house price so that they can be sure that only those who are willing to spend €2400/sqm come to them and are not dependent on bargain prices. I personally would probably accept about a 1% price increase rather than have the general contractor go bankrupt during my house construction, because he bore the risk.

... make sure that only those come who are also willing to spend €2400/sqm and are not dependent on bargain prices.

€2400 per sqm is, based on our situation, a bargain price. Well, but we probably did almost everything wrong.

2,400 per sqm are, based on our situation, a bargain price. Well, but we probably did almost everything wrong.

Oh come on. Your windows and some other things are more expensive, I think. The OP is orienting himself on the large cheap house providers. They do it with volume. Therefore many sub-teams with different nationalities, where vaccination or compliance with the AHA rules is not necessarily addressed, the latter being less observed. Thus, the contractor may have to take more expensive teams from the surrounding area at short notice or pay a surcharge themselves because they need the team on short notice. He does not want to be stuck with that. The higher-priced ones may have their own teams or fixed few craftsmen, do not build the volume, and can better assess their craftsmen.