Single-family house (2 floors + residential basement + developed attic) approximately 200 sqm - changes

Here are the setback distances for the 3 possibilities

[*]("only" the height of the ground floor and first floor * 0.4) + (the height of the gable wall (without ground floor and first floor) * 0.33 * 0.4) = 2.89
[*]("only" the height of the ground floor and first floor * 0.4) + (the height of the gable wall (without ground floor and first floor) * 0.33) = 3.99
[*]complete gable wall height * 0.4 (because it is the gable side - but I didn't find anything about this) = 4.36

About Sweet Home: you can forget the given measurements, not only for the stairs. They are mostly too small. Why do you want underfloor heating in the basement if it is supposed to be just a utility basement?

Regarding Sweet Home: you can forget the specified measurements, not only for the stairs. They are usually too small.
Why do you want underfloor heating in the basement if it is only supposed to be a utility basement?

That’s why I adjusted the measurements to the ones given here in the forum. Although we have special shapes, and I tried to take the running lengths and widths into account.
Underfloor heating: Both have said that the basement needs/should have heating because of the bricks. She estimated what omitting the underfloor heating would bring. Given the amounts we are talking about here, it was negligible. Especially since radiators would be needed then. You could have dimensioned the heating smaller (but the large one also costs "only" 7k – what would you save with the next smaller size?) and would have had to drill less deep. That way, except for the lack of daylight, we still have a livable basement – which is out of the question. But even as a fitness room, the heating can pay off sometimes.

Too much text. Sorry. But something is just not right with your situation. An architect who makes a floor plan for free and then the other does, and then without a contract or anything similar but immediately puts a general contractor on the table. Sounds strange.

As an example. We have a contract with our architect according to HOAI. The commission was in May. Now we are at the final floor plan design and exterior view and probably by mid-November ready to submit the building application. That doesn’t happen overnight...

Urgently inquire about the contract or how he envisions this.

To be honest, I’m also surprised that he hasn’t asked for a signature for the planning services yet, but maybe it’s because: It’s a house construction company. The mother handles the planning/offers, etc., and the son is the architect. And with all the prefabricated house providers we’ve dealt with so far, we had several meetings with the representatives and they clarified the offer. At the same time, changes to the floor plan were discussed here and there (even though the guy was neither an architect nor a structural engineer—more like an insurance agent). And here it’s apparently similar. The planning is then simply included in the house offer. The offer definitely stated that it included VAT and the planning and application costs (or something like that). This is my first time doing this, so I have no idea how it usually works. What I do know is that if I had to give someone money without knowing whether something usable would come out of it, I wouldn’t give them money. So if it didn’t work like that, we’d probably still be looking at prefabricated houses.

Asking about the contract? Hm. That’s been bothering me a bit, but what is that supposed to look like? And regarding the duration: We have been working on the new build since last October. We’ve seen enough floor plans of prefabricated houses (which are similar and also flexible for small adjustments, especially regarding the basement, knee wall, roof shape, etc.). We had contact with the architect at a fair and for a consultation already. Always very pleasant. Then also a house visit. Well, and when we found out that he could definitely keep up with the prefabricated houses, we decided to try it with him. But I’m honest: I wouldn’t have liked to pay in advance for that. In the end, am I paying for 10 drafts that I don’t like or can’t afford? Is that really common practice?

Your staircase ideas do not fit. If you went around the corner in the basement downstairs, the height there is probably no longer sufficient to walk through, since you are already 2 or 3 steps up, but the ceiling is still there on the ground floor, as the ground floor staircase starts further to the left. A sectional drawing would show this.