Here I already have doubts because of the floor space index. Without, however, being sure.
The floor space index as floor space index, we all know, is a factor.
The floor plan, the floor area, (for me) rarely used in development plans, is an absolute value and serves as the maximum sealing for a property, regardless of the size of the plot.
The up to 50% increase for ancillary facilities according to Par 19 of the Land Use Ordinance probably also applies here.
So all good.
170 sqm / 50% makes 85 sqm additionally for outbuildings, paths, and driveways.
exceeded by another 50%
They are already very generous. However, this does not apply to normal paving, only to grass grids, which theoretically could be used as an additional parking space, see Par 9 Abs. 1 No. 20 of the Building Code.
Storage rooms and garages are generally permitted as boundary development; with “workrooms” there can be debate, for a building application I would rename it.
A technical room is prohibited as boundary development.
The parking space or garage ordinance for Baden-Württemberg applies unless otherwise regulated in the development plan.
The development plan reads generously with regard to surface development.
However, the slope would give me some headache. Simply drawing a garage flat out will not be enough. Whether in the east or west: it is roughly one meter that needs to be leveled. Additionally, the access road.
Excavations are prohibited for simple terrain modeling of a garden.
The property measures roughly 20 meters in width and 27 meters in length. As I already said: an approximately 19-meter-long building body ensures that the building is pressed onto the plot and must additionally be either embedded or elevated. The creative “intermediate building” ensures that the building, i.e., the house, is built close to the neighbor and certainly to its garage. This takes away important daylight.
Daylight is naturally everywhere and always where natural light shines. With a development, one influences the daylight and the light incidence in the house. I guess this is not considered at all in the planning.
Of course, I agree with when he suggests mirroring the house, but nobody wants to stick to their evening terrace at the street. I will consciously leave aside that the design is flawed and the stairs don’t work.
What is wanted here and what concerns exist, the OP does not write*. Except that he rejects different levels. Why, he remains silent about. There are many young people who pick up something somewhere and then take that as their opinion. When you ask, there is no answer.
The problem, however, is when you buy a plot that does not have the conditions to build as you imagine. Without steps or ramps, the development, thus also the garden or the access, cannot be done. And then even the generous floor area development eventually ends.
Attached the calculation, what do you think?
You did not include your paths from #12.
For experiments and to see how various building bodies behave and what kind of house you get, these tools are very useful. But you also have to set boundaries for yourself and be able to delete again. Also to think in 3D, and that concerns not only the kitchen, how nice the island looks, but also concerns the terrain of the property. For that, it is always necessary to have the whole property present for yourself when planning.
One meter of slope may look like nothing in 2D, but here, precisely because it is only one meter and a large floor area development is desired, this meter can ruin many wishes if the heights are not considered and terrain modeling is not desired or too expensive.
The slope rather calls for a building oriented transversely. You should always build with the slope, not against it.
The orientation of the property rather suggests a bungalow with a long side to bring some light into the house. Possibly, or if not visually excluded, a staggered pitched roof with a third gable to the street is advantageous for natural lighting in the house.
* Then come the explanations:
now house classic basement ground floor upper floor attic, for us the horror,
Horror? Fear, terror, and disgust. Ok, everyone can express their reasonable concerns as they can and want. For building a house you should rather think realistically. Avoiding stairs because they are "horror" may possibly relate to the design of the stairs or floors. There is not only black and white but also other successful shades of gray.
A “horror” stair is incidentally drawn in the design here ;)
about the garden, we don’t need 1000 sqm of lawn, we find that completely overrated, yes everyone as they like...
An exaggerated overstatement, which is certainly not to be taken seriously for a roughly 500 sqm plot.
However, the development plan states how the property and the garden design should be carried out (points 4.11 - 4.15). So, not everyone as they like, but everyone as they like and must.