What is allowed to be built on the property according to the development plan?

Hello dear experts,

I have a few rather basic questions about the development plan:

According to my understanding, the following may be built on the corresponding plot (P80) with an area of 630 m²:
Detached single-family house/two-family house with one or two full floors plus roof
=> Is there the option to choose between one and two full floors?

Living area max. 630 m²
Living area per floor max. 220 m² (630*0.35)
Detached house
Roof pitch between 30 and 48 degrees => gable roof prescribed
Knee wall height (=Drempel?) max. 50 cm

Is that correct so far?

What I do not understand at all is the wall height.
According to the graphic, WH 1 = with one full floor between 3.70 m and 4.30 m
WH 1 = with two full floors between 6.70 m and 7.30 m
Measured from the road surface to the point where the roof touches the exterior wall (in this case north or south side).

How do I get a wall height of 4 m for E+D?

If the room height is 2.50 m plus ceiling thickness approx. 30 cm plus knee wall 50 cm, that is (without calculator) 3.30 m for me
Likewise, I cannot reach 7 m for E + 1 + D. For me that is (2 x 2.5 + 2 x 0.3 + 0.5=) 6.10 m

The plot has hardly any slope, from the rear edge to the front to the street max. 1 m (plot dimensions approx. 25 m x 25 m plus at the front at the street the part where the street bends toward the plot).

My first considerations for the floor plan are as follows:

[*]Two full floors plus roof
[*]Attic shall be rented out (achievable rent per m² approx. 7 euros)
[*]Double garage on the north side of the house
[*]Two parking spaces for tenants in front of the house towards the street
[*]Roof of the double garage usable as a balcony for the 1st floor (possibly children's room on this side)
[*]Living area and kitchen on the ground floor facing south with terrace in front
[*]Additional fireplace in the living room
[*]Also a small bathroom and a study on the ground floor (which may be used as a bedroom in old age)
[*]On the upper floor 2 children's rooms plus master bedroom plus bathroom
[*]Rainwater cistern

[*]Photovoltaics are to be installed on the roof, therefore roof windows on the south side and dormer on the north side (due to shading on photovoltaic) ?

[*]Living area for own use approx. 160 m² plus attic apartment

Whether we can/want to afford a basement is still unclear, but of course the space requirement on the ground floor for building services depends on that, I am aware.

[*]Budget as single-family house was planned approx. 350,000 euros incl. ancillary building costs
[*]Budget for two full floors not yet calculated. What must be calculated for the additional full floor plus stairwell?
[*]How large is the space requirement for a stairwell?

That’s it for now from my side,
thank you very much for the answers

Is there a choice between one and two full floors?

Yes, plus an attic, which may also count as a full floor according to the state building code.

Living area max. 630 m²

Floor area, not living area.

Living area per floor max. 220 m² (630*0.35)

Footprint, not living area. What exactly that is can be read in the version of the Land Use Ordinance (Baunutzungsverordnung) that was valid at the time the development plan was published. Sounds complicated, and it is, but with the large plot you have, it is most likely irrelevant for you. However, feel free to share when the development plan became legally binding or, even better, upload the entire development plan.

Detached house

In open construction, semi-detached houses and house groups are also permitted, unless the legend of your development plan explicitly restricts the "o" again.

Gable roof prescribed

I cannot find this restriction.

If the room height is 2.50 m plus ceiling thickness approx. 30 cm plus knee wall 50 cm, that is for me (without calculator) 3.30 m

Usually, the ground floor level is intended to be above street level, which makes rainwater drainage unproblematic – so add another 17-51 cm. And then it is measured up to the top edge of the roof covering, i.e. the entire roof structure is also included.