Single-family house orientation garden and terrace: south or west?

I suggest you accept it as it is, so the teenage children can still live for a while in the basement with decent ceiling height, where they have their own bathroom and access through the stairwell. If they no longer find it suitable, then they move out.

We live upstairs on one level, we only have to go to the basement to read the heating and electricity meters until we then move into the nursing home.

I really appreciate your expertise,

We appreciate yours too, but please spare the majority of readers without an 11ante-memory your endless dithering across many threads about ultimately the same construction project.

Please provide meaningful suggestions for changes and not just always "against" [...] In the other topics, garages and parking spaces were discussed, quote "cars are naked sleepers",

We are by no means "always against" and provide many meaningful suggestions. In exactly the post where you remembered the catchy quote, I also said:

Semi-detached houses would have been easier to market than flats in a two-family house. You were already "asked" to decide, because simultaneously renting out now and orienting towards owner-occupation later does not work. If suitability for the latter is a must-have, then you should also specifically plan the ground floor for yourself, and I would brutally clone the other floor in this case, unless the first occupier has other wishes.

These are several meaningful suggestions, e.g.: 1. build market-justified, market-friendly or at least market-compatible. This "neither fish nor fowl, actually I don’t even need it, and if necessary I’ll move in myself and/or wait until one of my children wants their own apartment" object nobody wants. As an investment (of the land, and possibly borrowed money on top!) it is at best worst-performing. Sell the land and plan houses only in your imagination, then you save the construction costs. 2. was the suggestion not to think too much about the "I don’t care who rents this unit" residential unit, but to simply photocopy the self-used unit for it. Also the advice on this topic

An entrance through the garage is explicitly desired, and that inevitably means that this entrance ends somewhere in a staircase, since there is no utility room on the ground floor.

Precisely not letting the tail wag the dog, prioritizing a secondary matter highly, is very sensible. A staircase is a matter of central importance and correspondingly disadvantageous when pushed into a corner where it is "ideal for the interests of a secondary purpose."

I explicitly asked that only actual questions be answered here, namely the orientation of the living room and the terrace with all its advantages and disadvantages.

That’s exactly what makes our value for a forum like this: that we answer the actual questions , not what business-blind and/or in the quirks of their own designs infatuated questioners mistakenly perceive as the "actual questions"!

Would we really be doing laypeople a favor by cuddling them in their interpretive sovereignty about what the actual questions are, letting them walk into their "ruin" [hheh], paying decades of interest on borrowed money and "contaminating" [as before] their land by building past the market of their own needs and outside demand?

I prefer the attitude that one’s own talents also oblige one to at least serve the general public with them. After all, in a free country you may be as resistant to advice as makes you happy at least in your own momentary perception. My thug squads have more important tasks than to convert your opinion.

And don’t forget: You as the visible questioner do not only ask your own questions here, but also — thankfully — dare to come out for probably about ten silent readers on average who face the same questions. My answers are meant to serve them all (otherwise I wouldn’t give them here in the open pro bono consultation). By the way, the paying customers of my chief physician visits in the single room also get targeted therapies rather than prescriptions for painkillers. Not only property obliges, but also four decades of experience in home planning do. And in the service of memorably phrased insights, I do not make fun of your naked sleeping cars, but of mine. Incidentally, there are always occasionally free single rooms, even for publicly insured patients.

I suggest you accept that the teenage children will live in the basement for a while with a proper ceiling height; there they have their own bathroom and access via the stairwell. If they don’t like it anymore, then they move out. We live upstairs on one level, we only have to go to the basement to read the heating and electricity meters until we then go to the nursing home.

Hm ... how to say this nicely ... that the basement here is a demand-oriented planned child floor suitable for secondary use, I’m probably not the only one who hasn’t read that from the beginning, and looking at the plans it doesn’t exactly stand out loudly.

Please provide meaningful suggestions for changes and not just always say "against it"

We or I am not "against it." What nonsense. The problem is that you want to help, but you filter what you want to read and hear.
From memory, you were pointed out the slope several times, this and that... and you always say "against it," because you think you know better.
A rather tangible example from life: You don't know what type of partner you have in mind, but you think of a woman. Blonde always works well, you choose her but realize she can't be blonder. Then you take a brunette. She is rather slim, which you don't like, so you tell yourself then I'll take someone more busty, but then a redhead because blonde was out of the question. But she also has disadvantages, so your wish is to go back to the brunette, but then the male alternative. That also has a catch. What I mean to say: You have been coming here for over half a year with a new dream house every time, without really knowing or stating your needs. If you always think one-sidedly in boxes, nothing will come of it. But we are supposed to assess a character trait here without knowing the whole picture. What good is it if we advise the busty woman, but you can't do anything with breasts?!

I therefore ask for appropriate answers,

In this respect, with a complex topic like house building, one cannot advise anything if you come here with _one_ floor, without the second even being known or existing. One depends on the other after all.

The north slope is just the way it is, and we have to accept that.

That fact is nothing new.

and that means this entrance ends somewhere in a stairwell

No. Wrong. That is your box. Nowhere does it say that you have a stairwell where there is access to the garage. And even further away is the fact that you have a stairwell in a single-family house. The very few single-family homes that have a stairwell are certainly not the coziest or best designed. Quite the opposite rather.

The classic single-family house looks different, I am aware of that too.

What does a classic single-family house even look like? Where does it say? In East Frisia or in southern Bavaria? Does it have a slope, one or two levels, is it a townhouse, or does it have a southern orientation?
Those who speak here can think beyond these boxes. For that, you need the plot, the development plan, the financial means, and the needs as well as wishes of the builder. If that is not clear, then you can also approach things flexibly. But still, some factors must be named. Which you, however, change according to your whim every time.

I therefore ask for appropriate answers,

And now to the most important point: the design of this one floor is a disaster both times. Easter does not change that, and it is also no April Fool’s joke.
And here is why: in the basement there will be supporting walls that should preferably be carried over upstairs, because financially it is not abundant. Your strange ant corridor divides the living area in the basement very unfavorably, so that the north side is not really well used. The windowless underground area is much bigger than it needs to be.
Then this stairwell: it shows that you currently have no idea how houses, especially family houses, are designed to be livable. I assume that you also do not collect information for yourself?! There is, for example, not just one thread in the forum that deals exactly with such hillside plots. Some are already built. But almost every house plan discussed here either has good zoning with a central entrance area as well as a more or less well-integrated staircase in the living space. And if not, then usually a good learning curve is evident, either accepting example plans or taking the advice not to overestimate oneself in terms of planning.
Now you are standing here with half the information if you just take this one thread from today. What advice can one give with so little information? Especially since this long corridor, these unsuccessful zonings with the entrance crammed into a corner already affect the viewer.
The occasional person immediately recognizes the handwriting of the incorrigible Ralf.
I believe no one even knows yet whether you have a family or children – they are first mentioned here in #7. And if they were mentioned earlier, it was rather secondary – it was always “a floor for me,” “one for renting out,” or “a house for a big family or one for two little ones”… so: how should one advise how the house is positioned if the need is not clear?

By the way: start with the basement, make sure most rooms get some daylight including the hallway, and then continue with the ground floor.
And if you consult an architect for advice, then tell who is going to live in it. Don’t make the same mistake again and again.

I repeat my question here again. What reference level has the building authority set for you?

I would plan both a south terrace and a west terrace.

A washing machine and dryer in the bathroom of a single-family house is an absolute no-go for me.
Separated staircases feel like something from 1980.
I don’t understand why there has to be a door to the garage next to the front door.
The dark hallways are more for vampires.
Somehow the open and bright layout is missing.

Do you know how the floor is? Have you talked to a structural engineer yet?
Start by planning the basement. You have rooms there that need light and rooms that should stay dark. You can’t have restrictions like a staircase coming from above.
What exactly is the building site like?
The reference point has also been asked about.