Single-family house with a granny flat on a 450 sqm hillside plot

Show anyway on what basis other providers should prove themselves.

The original draft provided for a somewhat larger base area and was planned on a slab. The salesperson of the construction company had the idea to freely dig out the base area and secure the soil towards the garden with retaining walls. The terrace was then intended as a bridge into the garden with additional storage space underneath it. However, the garden landscaper (and not only him) strongly advised against this plan for cost reasons.

The praise, for my part, did not refer solely to the drawing design, but to the mature appearance compared to the usual Pinterest nonsense with failed Tetris.

I gladly accept the praise.

What do you want to do now: start planning anew from the beginning instead of from the middle as before, or downgrade the equipment?

We have already obtained an offer from a provider who should be priced at least one shelf lower. They wanted an outrageous 3400 euros for turnkey construction of the upper two floors and obviously had no interest in the project.

Option A would be further reductions in the quality of suppliers regarding wall structure and materials used. Foregoing a KfW quality seal would also be a cost-saving no-brainer.
Trickier would be the complete overhaul of the concept. That would be option B.
One idea would be:
Lowest floor as a partial basement, with functional rooms in the rear area that do not necessarily need daylight, such as storage and technical rooms. Sleeping rooms in the front area.
In the upper floor then kitchen, living area with access to the garden, and at least one, rather two bedrooms.
Possibly also with expandable attic. Then initially one could do without a children's room and later create additional living space.
However, the thought of another floor plan development gives me a headache. Therefore, I am still leaning towards the first alternative.

... obviously had no interest in the project.

Well, they’re out then, I’d say.

A more tricky option would be to completely discard the concept. That would be option B. One idea would be: The lowest floor as a partial basement, with functional rooms in the rear area that don’t necessarily need daylight, such as storage and technical rooms. In the front area, bedrooms. On the upper floor then kitchen, living room with access to the garden and at least one, preferably two bedrooms. Possibly also an expandable attic. That way, you could initially do without a children’s room and create additional living space later.

I see that as the most sensible solution.

The thought of developing another floor plan gives me a headache, though. Therefore, I’m still leaning towards the first alternative.

Not me. ;) : Doesn’t the design already exceed the floor area ratio of 0.4 with 450 sqm across 3 floors? Is something not being counted here? I’m a bit lost. Could you briefly enlighten me?

Isn't the draft already above the floor area ratio of 0.4 with 450 sqm and 3 floors? Is something not being counted here? I'm just not following. Can you enlighten me briefly?

I'm not involved in the subject at all and just hope that the architect has taken that into account. But maybe it works in our case because the top floor doesn't count as a full floor?

I am not familiar with the topic at all and just hope that the architect took that into account. But maybe it works in our case because the top floor does not count as a full floor?

Ah, ok. Then that is probably it.

I am afraid that we will not get around a new plan. At least I will sit down and work on a floor plan, which I will then present here for discussion. Are there already any comments on the basic idea:

Lowest floor as a partial basement, with functional rooms in the rear area that do not necessarily require daylight, such as storage and technical rooms. Sleeping rooms in the front area.
On the upper floor then kitchen, living area with access to the garden and at least one, preferably two, bedrooms.
Possibly also with an expandable attic. Then one could initially do without a children's room and later create additional living space.