Floor plan planning shortly before submitting the building application

I will not get an expert for now but will pass the ball to the craftsman. If he does not consider the requirements of the Q2 level to be met, he should please justify this in writing and provide evidence if necessary. Otherwise, he should deliver as ordered or I am happy to allow him to withdraw from the order confirmation.

When this never-ending story here is over, I would plaster the name of the GU in screen size under the thread.

The GU is (not personally) known to me and does not make a bad impression on me at all. As a mistake (on both sides), I see more the risk taken to combine two things: the OP wanted a proper "architect’s house," i.e. with a lot of individuality even in the details; the GU "can" do something else: run-of-the-mill, run-of-the-mill superior, and run-of-the-mill exquisite — each gladly also with floor plans with their own inspirations, but still within reach of the standard. The OP broke out of this framework — a pilot project that probably neither will repeat. I am not quite an hour’s drive from the GU’s headquarters, without knowing any angry customers. What they normally do is a bit more basic fare — just in all price categories. So I can well imagine that they have never had a construction site with so many critical details and have to think on their side, "usually customers are satisfied, here probably the builder or their expert is acting up." I suspect that even something like the (caused by me) pre-installation for a passage door they have never seen before. And a builder who questions the shower water pressure, certainly not. From my point of view, two have come together here, at least one of whom should better have said "no" (which both probably could not have foreseen).

When this never-ending story here is over, I would put the name of the GU in screen size under the thread.

I find that neither funny, nor appropriate, nor is it allowed; but it fits your overall conduct here. The robber signed the contract under completely false pretenses, as the GU, conversely, also accepted it under the same conditions. I have occasionally expressed my opinion on the many inquiries, questions, actions, reactions, expert opinions, etc. from the robber and still do not see him as the "poor" client, as Josephine and others believe. I am almost certain that the robber has learned nothing from what has happened so far on the construction site and that the virtual hug from Josephine and others is therefore for him a confirmation of what he has always known. Quote: All scammers. So the best conditions to bring the BV to a reasonable conclusion.

The robber signed the contract under completely false premises, as did the general contractor in reverse, who also accepted it as such.

That's the crucial point. Anyway: It is no longer correctable. So what is the alternative approach that leads to an acceptable result? Do you have an idea? The expert is a must here and irreplaceable in this constellation of the general contractor, who tries to handle something that is not part of his portfolio, and the client, who wants something that he cannot get from this general contractor as is. However, some mistakes have also been made by the workers (or resulted from changes in the plan), which should not occur on a professional construction site, period. Well, it may happen almost everywhere. But it needs to be corrected.

The fact that many side battles are additionally being played out is due to the constellation identified above as the crux. Now, I think nothing more can be done there, it will run out toward the end like that.

I also make three signs of the cross when I'm done. As a layman, you are hopelessly at the mercy of the whole thing and you can't arrange enough expert accompaniment appointments. Now I have to call him again tomorrow to see if he can approve the plaster and how things look with these stair transitions. The other matter has to be handled by a specialized installer expert. Simply annoying.

Above all, we are falling further and further behind schedule. My interior finishers can't come in because they don't want to paint as long as the drywall ceiling isn't in. The drywall ceiling keeps getting delayed because not even a Blower Door test has been done. That is supposed to take place in at least two weeks, and after that the drywall ceiling will go in. Before that, no tiles can be laid because of the screed drying. This is all just stupid.

Above all, they just want to take the easy way out to meet the nine-month construction period. However, they only manage this because the owner trades are separated. But the nine months would have had to be met even if everything was included there. It will be a case for the lawyer to precisely quantify the exact days of delay that can finally be claimed there.

Has the blower door test happened yet?

...but both probably could not have foreseen that).

I see that somewhat differently. As a professional, I have to know my limits and correctly assess such a project. If it is foreseeable that too many unknowns will arise, one must also be able to decline. Otherwise, complaints and criticism will pour in. Accusing the layperson of having chosen the wrong professional, on the other hand, I consider nonsense. How should they know that the professional is overestimating themselves?