Low ridge height results in a low knee wall

That’s not wrong, but a basement is not included yet ... Prefabricated house providers usually offer from the foundation slab upwards

Look, the questionnaire in my opinion did not contain the key question: why do I want to build at all? For 40 years my answer was always: no. Now it is a possibility, also for purely economic reasons. Before the current interest rate crisis, the calculation was different. I consider the oil-heated house I live in no longer sustainable. That is my central starting point, where economy and ecology actually meet once. Owners of "old" houses often do not yet realize that solvent tenants might drop out in favor of a self-financed new building, also called a home. Every little village is now designating building areas... What moves me here is: I wade like a stork through shallows between municipal plans, building plans, house plans, sellers, ideologists, undefined terms, all together = risks squared.... but where do I remain? Oh yes, Schwörerhaus offers basements, that basically appealed to me.........

Look, in my opinion the questionnaire did not contain the core question: why do I even want to build?

The questionnaire is also not in the introduction section, but in the floor plan section. There, other questions and a certain structure are primarily relevant; the personal matters in the introduction section may of course be shared "without formal requirements."

Oh, yes, Schwörerhaus offers basements, which basically appealed to me.........

HUF has also founded its own basement construction company (with Ideal). Furthermore, there are a handful of independent prefabricated basement companies, among which Glatthaar is probably the best known.

: A question about your section drawing in post #16:
Why does the top edge of the floor start at 55 cm height relative to the terrain?
More generally asked: Why not have the floor level with the ground level, or perhaps even slightly below?
Then I see that the roof slope was placed over the 14 m wide side. You gain more height if you rotate the roof by 90° and use the 10 m side. I hope what I mean was understandable.

Since I would like to have 2.75 m on the ground floor

Since I place great value on high ceilings (atmosphere),

I understand that you want it bright, spacious, not confining, and atmospheric, but why do you fixate it on a number? Ceiling height? It's the windows that make the difference!

and in the knee wall storey it is cramped and therefore ugly.

and in the second floor there actually wouldn’t be any comfortable living space possible?

Knee wall then starts at 1 m or so... you can forget about that.

then the settlement house with a pointed gable roof - as you can see in the picture.

What am I overlooking here?
I want to move into a new house that is energetically future-proof, but I also want to feel comfortable in it.
If what’s above is not nonsense, then it won’t work

In my opinion, you overlook that rooms are not ugly just because they have sloping ceilings or a small knee wall. It may be that you wish for more higher standing area upstairs, but that does not automatically mean "ugly" or "unusable"!
What do you expect from the community here if you disparage what others have built?
Furthermore, the settlement house you posted is rather a modern house, which has the perfect form of an energetically very efficient house. A two-storey building unfortunately has much more negative exterior surface, which incidentally applies to any knee wall height.
A settlement house is more like a red brick building with a roof pitch of > 45 degrees.

In the model house settlements, I have not had the impression in any house that they are crouching to a certain height. These are mostly stately houses, sometimes with a great sense of space. You get tempted, and once home, you realize (or not) that it just doesn’t work.

Do you now want to say that the Danhaus Engelsby is crouching or oppressive?
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Number of persons, age: 2 persons 60+

Everyone has to know for themselves what they build.
However, I criticize four-person families who struggle with a bungalow.
With you, I honestly don’t understand the idea, a) to build with a basement b) to realize a lot of living space upstairs.
Your idea to have a separate apartment upstairs came across here a bit too little or not at all. I also don’t understand the motivation.
I actually don’t see the apartment here, unless it is absolutely necessary (care staff or something), but then 60 sqm is enough.

I would say: why don’t you focus on a bungalow? A nice cozy house for you two... from what you tell about your rental apartment, I’m surprised you’re even considering self-building.
Personally, I can only give the advice: Don’t build for others. Build what you will live in, no deserted rooms, no rooms that are used two or three times per year.
And don’t fixate on any numbers.

HUF has also established its own basement construction company (with Ideal). Furthermore, there are a handful of independent finished basement builders, the most well-known of which is probably Glatthaar.

First of all: great posts! Thank you very much!

@ 11ant: You know your stuff! I was also at HUF, for me the most atmospheric house in Frechen. However, in terms of price, top tier, as I understand it.

Attempt:

Ahh, the fog is slowly clearing. Now just a generous excerpt from the development plan drawing, the textual provisions, and an extract from the cadastral map, and the building rights can be assessed.

Floor area ratio
Floor space index: 0.35

Either you did not find the floor area ratio or you confused it with the floor space index. Probably it doesn’t matter for your project unless the floor area ratio is below 0.3.

7.20 ridge height from top edge of finished floor

There you go. That’s 15cm more than in your section, 40cm more than in mine, since the

reference point according to the development plan is derived from the street surface (!)

but not the 7.20m.

Number of storeys: I ... dormers max. 3m wide

That requires a bit of attention in planning, which you can’t necessarily expect from prefabricated house manufacturers.

Overnight guests per year: 4* 3 persons

... which is why I cannot understand your high demands on the living quality of the attic.

What moves me here: I wade like a stork through shallows between municipal plans, building plans, house plans, sellers, ideologues, undefined terms, all together = risks squared.... but where do I remain?

You had such a nice conversation here with Martina five years ago. She could – even today – provide you with the appropriate answers, advice, and risk assessments for all your questions and concerns. Since that is a lot of work, which sellers due to lack of expertise and willingness are unable to accomplish, it naturally costs something. And even if it turns out in the end that building is not right for you, it is well-invested money because it frees your mind again.

Why not level the floor with the terrain height, or maybe even slightly below.

Because the 7.20m refers to the finished floor.

You gain more height

Precisely that is to be avoided. The maximum ridge height is fixed, so that the sectional geometry of the building is fixed with the minimum roof pitch of 30°.