House construction on a slope (Central Hesse)

Hello everyone,

we are currently planning our house construction and more and more questions are coming up.

Our plot (approx. 770 m²) is on a slope, which makes us tend, based on some reading, to build our house with a basement, since we would rather not dig ourselves in and look against an earth wall.
I have attached some excerpts from the development plan.
The plot is rather elongated (approx. 20 m wide and 40 m deep and rises from the street). According to the Geoportal Hessen, we have a height difference of approx. 3 m over the 40 m depth.

Then the first thought was: "Okay, then we just build with a basement." However, we then dealt with the individual height specifications from the development plan and here there could be a problem with the eaves height of 5 m (measured from the road surface edge (highest point) of the street, measured vertically in front of the middle of the building).
With the 5 m eaves height we would have to dig the basement about halfway in, right?
We had thought that one could basically enter the basement (UG) from the street at ground level and then enter the garden from the living area (EG) at ground level at the back.

How do you assess the dimensions of the development plan?

We were at the model house exhibition in Bad Vilbel over the weekend and had, among other things, a conversation with a gentleman from Fingerhaus, who suggested a kind of compact basement, which is not accessible from inside the house, but only from outside. Does anyone know this type of basement, or are there already experiences with it? Could you then not simply build a "real" basement?

We roughly calculated the costs:
House (turnkey) according to Fingerhaus (Type Sento B): approx. €300,000
Floor + walls: approx. €20,000
Additional equipment: approx. €50,000
Basement + incidental construction costs: approx. €80,000
Do you consider these figures to be reasonably realistic?

Can anyone by chance recommend construction companies from the Mittelhessen area?
Can construction companies provide a cost estimate based on the existing data or do we first need a soil survey or the exact heights etc.?

Questions upon questions, but somehow you have to start somewhere.

Thanks already for any tip or answer!

With the 5 m eaves height, we would have to dig the basement in about half, right?

Yes.

How do you assess the dimensions of the development plan?

The neighboring plots are already built on. You can take a look there to see how they solved it. But 5 m eaves height is really inconvenient for that terrain.

3m height difference over 40m I don't find that much. Is there a steeper slope in the construction area? Otherwise, that would be a 75cm difference over a 10m house. I would probably dig out 30cm at the back and build up 35cm at the front rather than spending 100K on a basement.

Thank you for your answers! Yes, the eaves height is currently causing us the most concern. This section in the development plan was only added later. In the old part, the eaves height is calculated from the highest cut point of the natural terrain. That would have been better for us too :-/. Yes, digging out and filling in would of course be another alternative. No, the slope is quite even. How can I most accurately determine the heights to plan everything better?

At 3 m on 40 m, I would also dig in at the back and fill in at the front.
On top of that, a gable roof with 1.5 floors.

The B‘Plan and the plot do not allow for a basement entrance and garden access on the ground floor.

How can I most accurately get the elevations to plan everything better?

Surveyor? Some federal states have an online Geoatlas. In Saxony, you can also query the elevations. You can try searching to see if you find something for your area.