Calculation for a single-family house with 175m² living area, basement, and double garage

Since we are planning with [TG], the question of building without a basement did not even arise. But I am really looking forward to having my own large hobby basement / communal area and so on. I think, due to the fairly large planned light shafts with over 2m basement windows, it will look good as well.

There are also partial basements, which I find interesting in principle. For example, only the heating system and maybe a storage room go downstairs. However, I have no idea how much something like that costs and whether it is worth it. For example, Glatthaar calls it an "Effective Basement".

I have spoken on the phone with several manufacturers of such mini basements - they all say that it only pays off in Stuttgart with the pharmacy prices for land area.

We are currently in loose contact with an architect who has already done some preliminary planning for us. In this process, a problem has come to our attention that we had not really considered before: The development plan stipulates for "our" plot that we are only allowed to build single-story (or 1.5 stories) – knee wall 60 cm and roof pitch 30 degrees. This results in us struggling with severe sloping ceilings on the upper floor. The restriction does not apply to the other parcels and houses in the area. Can someone possibly explain the background here? Why does the development plan explicitly "restrict" individual parcels? It seems that it cannot be changed, but perhaps this understanding will make it easier for me to deal with. This leads to the consideration, which has already been mentioned in the forum: moving the office out of the upper floor and into the basement. This frees up the floor area on the upper floor for the bedroom (including dressing room), bathroom, and children's room. Although the floor area seems huge, the effectively usable space remains relatively small.

I believe this is now the point at which a floor plan etc. should be shown. Or did I miss something?

If you want to know how exactly this development plan came about, then get the justification for the development plan. It should explain what the interested planner aims to achieve with it.

The development plan stipulates for "our" property that we are only allowed to build maximally single-story (or 1.5 stories) - knee wall 60 cm and roof pitch 30 degrees. This results in us having to struggle with severe slopes on the upper floor. The restriction does not apply to the other parcels and houses in the area. Can someone possibly explain the background to me here? Why does the development plan explicitly "restrict" individual parcels? It probably cannot be changed, but maybe this will make it easier for me to deal with it.

If the case is really as incredible as it seems to you, then I would also see it as possible to overturn a legally binding development plan. Whoever is most qualified to say something about the interpretation of the development plan here - - I assume to be known. You should name the plan ("Posemuckel Nr. 123 Heinzmeiersiedlung"). I am also happy to take a look; those who do not yet have PM rights here can also contact me via GMX (de) under the same name.

If you want to know how exactly this development plan came about, then get the justification for the development plan. It should explain what the interested planner wants to achieve with it.

Exactly in the justification for "the nasty restrictions apply exclusively to the property of Wormser1989" the lever point is likely to be found (if the regulation was read correctly).

I am not immediately so reactionary as to think about overturning. In any case, I am regularly amazed at how many thoughts some people have before the enactment of such a development plan - even if they are sometimes totally unrealistic.