Building with GU - Offer from GU including design

No, the question from the OP is answered in a shortened way by telling him that as the builder he has the control function with his signature. That's it, end of story. Further answers become unnecessary. I don't discuss the location of the windows in a floor plan discussion either, if the staircase is already wrong!

I see EXACTLY that completely differently. Someone receives the planning documents that they commissioned and discovers an error, the correction of which would cost several thousand euros, if they initially concealed this error. ....

If one were now to support the discussion and legally address the described situation, we would essentially be providing instructions on how the original poster might possibly enrich themselves at the expense of the general contractor. ....

I see absolutely no chance there! One can and will expect a client to constantly check the documents before the building application.

Me again, unfortunately pumped full of a ton of anesthetics (medically prescribed, mind you), I am now rereading the initial thread: many building contractors make offers based on their nicely finished documents of already fully calculated houses. If you then sign these, of course you have to expect additional costs as the builder. For every adjustment. But I don't understand the question either, because an offer is always variable when it comes to adjustments and upgrades. Of course, this also includes the KfW or the roof pitch, altered knee wall, etc.

The offer is a custom-made offer. The general contractor (GU) has been given the development plan and all necessary information. The design had an impermissible roof pitch, and in my opinion, the knee wall is also not possible, provided that the foundation slab has to be set at the height of the sidewalk surface edge. I noticed this and clarified it with the GU and will receive a corrected design in the next few days.
What troubled me was the question of what would have happened if (as a layperson) I had not noticed this and had "in good faith" signed the contract including an impermissible design.

Mistakes happen; the question is always who takes responsibility for them. And I wanted to know that in advance. This has absolutely nothing to do with trying to deceive the GU or gaining an unfair advantage. On the contrary, I want to avoid that, because discrepancies cost time and money. And we all know how often that happens in construction, and then it’s about finding the responsible party... and the stress begins. Therefore, I prefer to check things beforehand as far as possible for me. This is also the reason why I have not been building for half a year already, because I am preparing as well as possible for the upcoming project and not just blindly plunging into it. I don’t care how others do it or if others see that as wasted time. I want to build with a good feeling and be convinced that I have a competent partner by my side whom I can trust not to exploit my ignorance and to take responsibility for their own mistakes, as I do.

If I had signed the first offer six months ago with the knowledge I have now, I would be living today in a house with poorer technology, special requests that were "pushed on me," less living space, higher costs that were not yet known to me at that time, and a fixed price that would certainly have risen by 20%. I am sure that today I am getting more house for my money and have less reason to be annoyed about why I did not inform myself better in advance (as you also require).

Get well soon!

Get well soon!

Thank you

... Therefore, I’ll save myself from quoting, I tolerate your question because trouble is predictable. But your question could have been asked a bit more neutrally!

Be that as it may: women, wives, and housewives also belong to the legally competent group.
If this wife or housewife also wants to be involved in this new building, even if only through signature and/or moving in, then she should also memorize (have to memorize) a few measurements, numbers, and sentences from the development plan or the terms and conditions.

Asking the builder costs nothing, and if he blocks or brushes off, then you should go to another one.
Confusions can always happen.

Off Topic: why do I often have the feeling here in the forum that the wives of male members only deal with trivial matters (can/may)?