Floor plan of a two-family house (side by side) on a south slope

How should the procedure be to reduce costs? Reducing square meters and/or enclosed space is the obvious first step, isn't it?!

But definitely in service phase 2, otherwise the problem will persist.

But definitely in performance phase 2, otherwise the problem will persist.

Oh, I see, yes, I misspoke with "draft," we are still in the preliminary planning stage.

Oh, yes, I used the term "draft" incorrectly, we are still in the preliminary planning phase.

You can politely say that this is not evident from the illustrations in post #28. Where did the architect study?

That is not at all apparent from the illustrations in post #28, to put it mildly. Where did the architect study?

I can't follow anymore. Are there major mistakes in here?

I can no longer follow. Are there major errors here?

The drawings do not look like the design phase 2, which in my opinion clearly is a "yes" by itself a major error, even without the need for the details drawn in to themselves contain further errors.

The drawings do not look like Leistungsphase 2, which in my opinion is clearly a "yes" in itself a gross mistake, even without considering that there must be errors contained in the drawn details themselves.

I, as a layperson, really cannot assess this and it is also not very relevant to me whether it is a Leistungsphase 1 or Leistungsphase 2 drawing, right? However, my contribution was aimed at an assessment of the drawn floor plan and my intended modifications. Here I would like to hear opinions.