Floor plan single-family house 190m2 with basement. Feedback?

above all knows the entrance on the ground floor and the living rooms in the basement as it would make sense for you.

Thanks for the compliments to everyone. :) I have to admit that we don’t yet know exactly what we will put into the outdoor facilities in the end. But the plan is that we don’t have to spend a fortune there for now. That makes it easier if there’s still a lot to do at the end of the budget. ;) Our builder has distributed the excavated soil across the property and has provisionally terraced it. That should prevent us from having to haul too much away, because trucks driving to the landfill are currently very expensive. We’ll see once we’re further along how he manages to distribute and “hide” it on the property. And if there’s still too much, we’ll haul some away. I’ll try to bring some drone photos soon. We’ve already piled up a slight steep slope towards the neighbors through our excavation work. You’d be surprised what comes to light there.

especially planned the entrance on the ground floor and the living spaces in the basement the way that would make sense for you.

Exactly, I actually like that quite a bit. You enter the hallway from the garage/front door, and down the stairs you go to the living areas and from there also into the adjoining garden. And if you go down the hallway instead of the stairs, you get to the bedrooms and the bathroom.

The plan so far: The plot is 40m long and loses almost 5m in height along the way.

Then I don’t understand your approach. You wrote that you want the ground floor to be level with the terrace and garden. If you build up the terrace, you still have to go down to the garden via stairs.

A level exit onto both the terrace AND the garden is only possible if the front lies lower (i.e. a basement as living space).

At the very least, your idea is planned “past” the terrain. Planning with the terrain can save enormous costs that you would otherwise have without added value. If you want to build up as much as you do, that is definitely far from an optimum measured against the terrain.

Maybe it’s worth letting a proper architect look at this WITHOUT a proposal and only with a room program. Under these conditions, you will most likely exceed the budget anyway.

I also want to go directly into the garden from the ground floor (i.e., the floor I enter from the street).

But you don’t have direct access to the garden if you fill up/raise your terrace.

At the same time, for us, a terrace is not a balcony -

None of us are advising you to have a balcony.

We would like to do that – but I’m missing the brilliant idea for the following problem:

Do you have a good suggestion?

Yes, as I and others have already said: 2 floors: one from the street side, the other into the basement with garden and terrace access. There are plenty of floor plan discussions here dealing with the slope and maximizing the living space without wasting money on an expensive utility basement. The most recent one is by ; best to check the threads “under” you, there are successful ideas there, even if hidden in the discussion pages. I always recommend also looking at other discussions in parallel to change perspective and since you yourself are not affected. Regarding your explanations, Au pair or visiting parents, your plan doesn’t fit anyway. You’d be stepping on each other’s toes in the sleeping area and there’s no privacy – tolerable in a 130 sqm house but not in a large 190 sqm one. At a minimum, the office should be multifunctional.

So far, we have budgeted 73 k€ for ancillary construction costs and slope stabilization, but have not yet found a way to substantiate this number. How did you do it?

We found a general contractor who is familiar with slopes and agreed on a fixed price for the turnkey house and support measures. Both were adhered to and executed excellently. We also designed our floor plan ourselves. We were very satisfied with it, as was the majority of the forum.

By the way, I share the opinion of the other users:
If you feel like you are not 99% super happy with your floor plan, then I am fully with (go to an architect with your budget and room program and have it designed individually based on your property). I see more of a (large) two-story house here, with sleeping upstairs and living/dining downstairs with ground-level garden access. I always wonder whether and if so when the builders realize that their house does not (really) fit their property. There are many residential towers standing here where it is obvious that the approach was "House A must be placed on our property."

In your case, I would also plan only two rooms for the 3rd child/au pair/guests instead of 2+1 backup rooms. You need the money elsewhere. Basically, I belong to the faction that prefers "(parents-in-law) to stay at a hotel" rather than provide an extra room here. Although I do see the point if it is 12 times a year (wow, that’s once a month!).

The companies we are talking to are "Büttner Massivhaus", "Probau Massivhaus", and "dechant hoch- und ingenieurbau gmbh". Only Büttner can be found something about. However, all three companies are well known and popular in the region.

Regionally known and respected companies are very valuable. I found nothing about Dechant that would make them appear recommendable; their focus is apparently clearly outside single-family houses. You can already find Büttner and Probau mentioned here:
https://www.hausbau-forum.de/threads/empfehlungen-bauunternehmen-aus-der-region-franken.27790/page-2#post-562343
https://www.hausbau-forum.de/threads/bauen-mit-probau-massivhaus.1192/
https://www.hausbau-forum.de/threads/baufirma-fuer-massivhaus-im-bamberger-raum.33182/

The planners’ procedure is to record our wishes and then make a proposal. However, with "large living room," "straight staircase," and "on a slope," we have already brought so many constraints that the planning freedom is restricted. It felt like none was really interested in showing us alternatives. So, for one wish of ours, to provide 2 - 3 alternatives and then let us choose the one that fits us best.

*LOL* The idea many prospective builders have that construction companies would serve up a presentation of three building proposals to acquire the contract – as if they were advertising agencies in a Hollywood comedy and it were nothing less than the campaign budget of the Worldwide Biggest Business International Corporation for the next five years – is almost amusingly naive. Then you – despite having friendly architects – put the icing on the cake by coming with a draughtsman’s plan for a slope property, which in itself borders on mild insanity. Further encumbrances on the design (like a "straight staircase") can already make the barrel overflow, but at least should be downgraded to nice-to-haves. Taking into account the house’s distance from the street, a full basement height is already used up just to level the house, and connecting the garden directly ("arrow-straight," as Chief Inspector Anton Stadler would say) to the living area leads to the location of the living room in the basement. It is also certain here that, even with clever planning, quite a bit of money must be spent on terrain modulations (which I prefer anytime to L-steel retaining walls).

From my point of view, any construction company disqualifies itself at the point where it does not clearly advise concepts with a residential basement. Such concepts hardly or never appear in their building proposal catalogs. Catalog designs therefore regularly lead to buildings that are too expensive with overly large sub-basements and lavish terracing effort. Straight lot designs of any origin belong in the poison cabinet for slope properties.

Definitely go with self-paid architects for at least performance phases 1 and 2. You essentially need a spatial concept that actively includes the basement in mixed use (= living on the valley side)!