House construction on a slope (Central Hesse)

-Electrical installation work (e.g. brand Merten Atelier) [...]
-Noble, free-standing solid wood staircase in beech [...]
-Security package: smoke detectors, 3-point locking front door, windows with mushroom head locking

The design of the switch frame says very little about the quality of the electrical planning. Currently, we have a case here where "telephone connections" are included in every room:
"Solid wood" may sound valuable, but secondly relies on laypeople's ignorance equating solid wood with full wood and, firstly, does not seem an advantage here either. With "beech," a veneer will be meant here, and another wood-based material in between would not necessarily be worse. Here someone wants to corrupt reason with romance.
The number of locks alone says little about the burglary resistance of a front door, namely e.g. nothing about its filling. Only fivefold would be above standard. Mushroom heads are simply state of the art, but only make sense on the ground floor or in accessible areas of the upper floor. See above

Ytong is not the best building material...

What I read about it was that Ytong, like sand-lime brick etc., each has its advantages and disadvantages

The latter is correct.

Interior walls as drywall are inexpensive.

Constructing mostly non-load-bearing interior walls in drywall is not fundamentally negative and is time-saving in the pitched attic as well as provides more freedom in the statics in connection with a truss roof.

I would also recommend split-level.

I agree, has already mentioned the examples from Laux.

We are currently tending to raise our plot slightly.

I do not, especially not with a garden-side slope.

Just on the subject of stairs: I have one made of beech, real wood. But since I didn’t want the color tone either, I ordered it stained white. And because that somehow didn’t work out, it was finally waxed white. It looks good, very bright, no one knows anymore that it’s beech. And the steps are not so smooth, so you don’t slip. Absolutely affordable in terms of price.

Thank you very much for your answers!

We will probably have to deal with the split level after all, even though I am initially a bit skeptical because of the many stairs. But I am happy to be proven wrong .

I don’t, especially not with a garden-side slope.

Could you please explain that a bit more precisely? What exactly speaks against it?

Thanks!

even though I am a bit skeptical at first because of the many stairs.

Four half staircases are also two whole ones – although they do not necessarily have to be evenly divided – and this makes the house compatible with the fact that the property is on a slope.

Could you explain that a bit more precisely? What exactly speaks against it?

Because rainwater depends on gravity. Think it through to the end how much landscaping of the terrain that means up to the end of the terrace if you don’t want to be sitting in a hole there.

Four half stairs are also two whole ones – although they don't necessarily have to be equally divided – and it makes the house compatible with the fact that the plot is on a slope. That rainwater flows by gravity. Think that through to the end, how much terrain modeling that means up to the end of the terrace if you don't want to sit in a hole there.

Yes, with the four half stairs you are of course right again.^^ However, I still don't quite understand the second part, sorry! The modeling from the end of the terrace to the end of the property (i.e. the garden) would be independent of the decision "split-level or not," since the height of the terrace would be the same in both cases. With split-level, only the front part would be lower each time. Towards the back, we can't go any higher either, as it is limited by the eave height. Maybe I'm just missing something here...

It may be that I am missing something here...

Where exactly is the property described with heights and quotes from the text section of the development plan (or where can it be found - please provide the name, not a link)?