Construction progress: Duplex with WU basement and developed attic

Yes, but how much? Where does that come from?

It is stated in the contract how much is calculated for each trade.
Electricity: amount x
Sanitary: amount x
Shell construction: amount x
...
You can easily verify it there. So far, without exception, the exact amount invoiced has always been the amount stated in our contract.

Of course they deviate.

Then I don’t quite understand the fuss. Factory and execution planning are also binding for the subcontractors of the general contractor. Accordingly, defects/deviations in the execution planning must be rectified free of charge by the subcontractors / the target specified in the execution planning must be achieved.

Then I don’t quite understand the fuss. Factory and execution planning are also binding for the subcontractors of the general contractor. Accordingly, the defects/deviations in the execution planning must be corrected free of charge by the subcontractors / the target described in the execution planning must be realized.

And how would you see it if the general contractor only passed on my orders to him incompletely to his subcontractors and there is not even a written order for them? These still do not have a trade license for the work carried out here, but call themselves, among other things, construction service providers, janitorial service, etc. I think I know the answer.

The contract states how much is calculated for each trade.
Electrical: Amount x
Sanitary: Amount x
Shell construction: Amount x
...
You can then follow it well.

You seem to have an extremely strange (probably mailbox) general contractor. I am confident that a possible summer slump in this forum would be filled by your next butcher shop thread. At least the one by should be a match for your general contractor ;-(

It's a pity that "Die Bauretter" or "Zuhause im Glück" no longer exist. With the defects and story, you could make a double episode or miniseries (possibly also on Netflix). But there is supposed to be a follow-up format. If I were you, I would seriously apply there.

The contract states how much is calculated for each trade. Electrical: Amount x Plumbing: Amount x Shell construction: Amount x ... This can be easily traced. So far, without exception, exactly the amount stated in our contract has always been invoiced.

Yes, the one stated in your contract. But didn't you previously write that the amount in the contract is exactly the same as the one in the offer for the individual trades and the one that is invoiced to you?