Procedure for constructing a new single-family house on an existing plot

I don't understand that now, but maybe it's more about terminology right now?

By the way, you can find something like that on Google: Storeys are above-ground storeys, if their ceiling top edges protrude on average more than 1.40 m above the ground surface, otherwise they are basement storeys.

I don’t understand this now, but maybe it’s rather a matter of terminology? I believe that usually with a slope, a basement in the sense of a "whole floor completely underground" is not meant, but rather that on one side a floor is more or less buried in the slope (=> on that side it is a basement), while on the other side at the same floor there is a ground-level exit.

A "basement" in the sense of my basement rule means actually using a full floor height amplitude of the terrain elevations within the house footprint with a floor, instead of wasting the correspondingly necessary financial expenditure meaninglessly on earthworks and slope stabilization measures. In short: if you trace the outline of the house anyway with man-high L-shaped stones, you can also create usable space inside (preferably in a residential form).

That means possibly (if it roughly fits the slope, possibly with a few steps) you have the entrance at the "ground floor" on the street side and on the garden side at the "basement floor" (or vice versa depending on the slope). Whether this remains a basement as a special floor in administrative terms or simply counts as a full floor depends, among other things, on how deep you have to dig on average...

Floors are above-ground floors if their ceiling upper edges protrude on average more than 1.40 m above the ground surface, otherwise they are basement floors. The ideally residential basement floor in this sense protrudes so far out of the terrain that on the valley side its window sills are snow-high above the grass surface and on the uphill street side the ceiling upper edge of the entrance floor is positioned so that the bottom plate remains dry even during heavy rain. For entrances or floor-to-ceiling windows, "light wells" are then required.

Thank you for your continued interesting and insightful comments!

I am curious to see what will hopefully be available by next week.

Basically, everything seems feasible on our property:
- Basement (possibly with a livable part / daylight)
- "Mixed solution" (see post #58 by Katja)
- no basement at all (I consider that rather unlikely)

For me personally, the only real drawback of a genuine basement might be the accessibility from the living area / kitchen to the garden. We have also communicated this wish to the architect; if this cannot be implemented well, a "mixed solution" could become interesting. Or not every wish gets fulfilled ;)

Good idea – and otherwise I also see parallels with the peaceful hillside location of @JayneCobb’s property – by the way, there I advocated living with a distant view and sleeping by the garden exit

I find the solution with the basement under the garage and using the lower level for living space an interesting approach; we’ll keep it in mind.

many greetings

In paragraph 2 section 4 sentence 1 of the Niedersächsische Bauordnung, a full story is only considered as such if the clear height is 2.20m or more over 2/3 of the area. This allows for some quite amusing constructions in our development area (less so for the neighbors), as no eave height is specified. Thus, in the countryside a 9m high building is erected that looks like it has three floors, although only one story is permitted (full story, recessed story with <2/3 of the full story's area, non-full story under 2.2m on top). Or the latest highlight at the entrance of the development is a 4-story apartment building in an area with 2 full stories (story <2.2m for garages and building services and bicycles, full story, full story, recessed story). With a height just at the allowed 12m. And it looks like a block with 4 floors. What I mean to say is that German building law is quite generous when there is no eave height but only a roof ridge height as a limit.

Is the road already constructed? Or is there a plan? Preferably with elevations?

and the UG for living space

Exactly! Forget the term basement, call it underground floor but omit any upper floor.