Independent building expert - Necessary or alternatives?

In general, the warning is issued that currently it is a seller's or craftsman's market.... what good is it if you complain and the craftsman says he does this 150 times a year. The art will be to weigh when the expert is "exaggerating" and when you really should stand your ground....

Windows are great for us, everything we complained about was fixed.

Same with the shell builder.

The plasterer will still be difficult to get, some things are out of tolerance, he simply has so much to do.

And the carpenter really didn't care at all about our complaint. Even an expert can't change that.

And what did this fun cost you?

Yes, but that's no reason not to do anything and just accept it.

Yes, and what would that be that you would then undertake?

Would be 10,000€ at the TÜV.