Floor plan single-family house 1.5 floors, gable roof without basement, 190m²

On the ground floor, I already see a small placement problem because of the closed kitchen, since you probably don't want an island there but rather a dining area with 4 seats. Then consider that you have to bring the "fine food" for guests, like back in the days when it caused light beads of sweat on our grandmothers' foreheads, over a long distance with a tray or something similar. Luckily, nowadays you no longer constantly have to talk about stinky food, but can enjoy the aromatic scents of a full variety of spices in the background; therefore, you do not want to make too much work for the kitchen user and want to allow short distances and social contacts. But well, everyone has to decide for themselves. At least a direct door opening from the kitchen to the living space would make sense.

Yes, that is exactly our problem as well. We are not really happy with this solution and are now trying to find something where we can maybe open up the kitchen after all. However, there should also be the option to close the kitchen with a sliding door if needed. We have already thought about quite a few options. Also, to put the kitchen where the guest room is now. But actually, we should have the kitchen facing east so that it is nice and bright in the mornings, etc. It’s really not easy.

Otherwise, I find the exterior dimensions of this house not successful for this standard floor plan. Here, a bit more depth and less length would be more appropriate. Then you could have what is necessary there and subtract where there is too much (for example, the living/dining area is too long, but in width, 50 or 60 cm are missing). You could give the children's rooms the bay window; the children's rooms would also be more appealing in layout but better lit, since the rooms would not extend so far into the interior of the house.

Exactly, the general dimensions really aren’t optimal. That’s why we are looking into how much this can be changed. And then just like you say, not so wide, but instead somewhat deeper.

The bedrooms/closet and kitchen/access are truly not ideal now and won’t get better with a simple rearrangement of walls without having to accept other compromises.
Even moving a wall in the rather large guest room only promises to reduce one partition wall there. And yes: the bay window… it is always the bay window, which is usually chosen too small to have any added value other than just creating annoying corners.
Instead, you are stuck with a room upstairs that was not really necessary and was planned only because it was “too good to lose.” What added value do you expect from this room?

Exactly, it’s not ideal. But surely there is a solution for everything... ;-) As for the bay window, we really like it and it also does something for the outside appearance. Upstairs is our office, so you can have a nice, bright room for working from home. So we do need it. ;-)

Are the exterior dimensions given by the general contractor like that?

In this floor plan, yes, but certainly still changeable.

Some more objections:
The kitchen belongs to the outside terrace (just like it belongs to the dining table),
sunlight through wider windows with a sill reaches more room than sunlight through narrow windows without a sill.
The wardrobe is missing or too small. I also don’t see a sufficient closet for 4 people.
Just so you know: swapping the WC and utility room here would already bring a large gain in usable space.
The hallway lacks daylight.
The step dimension of 23 cm is too narrow and could be difficult to walk on. Here you can again see (also with the unusual winding) the missing width of the house.

By the way, it is nice if you check your own question post a bit and also respond to questions from willing users who want to help you.

Thanks for the additional objections. In what way do you mean that the kitchen belongs to the terrace? Do you mean that the kitchen should adjoin the terrace?
We will still change the wardrobe; it is too small for us as well. For the hallway, we are planning an additional window next to the front door to let in light.
Regarding the staircase, I actually can’t say much. But we have also already thought about possibly replacing it with a U-shaped one or something similar. We’ll see...

What do you mean by "potential downwards"?

Well, that 190 sqm contain about 40% fat...

the idea was to push the door to the kitchen as far under the stairs as possible,

I see this condition "as far as possible" here as exaggerated / not fulfilled.

Development plan: No further requirements. Only max. 2 full floors, nothing else.

At least the building height would still apply, I also see a boundary line, so presumably you just have more but haven’t read it out.

The step measurement of 23 is too narrow and could be hard to walk on.

That’s right. It seems to me that neither the client nor the planner have a sense for dimensions here.

Well, that 190 sqm contains about 40% fat...

I see this condition "how it goes" as exaggerated / not fulfilled here.

At least there would still be the building height, I also see a knot line, so presumably you simply have more but just haven't read it out.

That's how it is. It seems to me neither the client nor the planner have a sense of dimensions here.

So you mean that we do have 190 sqm but because of a not so great layout we can't fully utilize it?

We would just have to have the staircase checked, also with the staircase. And it is only a consideration at the moment.

Regarding the development plan: I did write the max. building height and it is also in the picture I posted. Max. 9m.

So you mean that although we have 190 m², we cannot fully use it because of a not so great floor plan?

No, the floor plan is actually quite normal in terms of layout, so much so that I initially overlooked the steep staircase because I assumed a functional catalog design. I didn’t count the square meters – but if the total area is that large, then it exceeds the discernible needs here so considerably that a lot can still be left out. Overall, I have some reason to believe that you and the planner lack an understanding of dimensions. Then a total area easily swells as much as public construction costs do otherwise ;-)

But actually, we should have the kitchen facing east so that it is nice and bright in the morning, etc. That’s really not easy.

There is only sun in the morning in winter ;) If you value the sun in the east, why not also create a breakfast terrace there for the weekend and accordingly open the house in that direction? But you would have to get up early :)

Upstairs is our office so that you get a nice, bright room for the home office.

The best place for HO? Sorry, it’s nice but from 2 p.m. the expensive blinds will also have to be lowered. I don’t know what must inspire you so much towards the west that you can keep looking at the PC ;)

Do you mean that the kitchen should connect to the terrace?

Exactly :)

Well, that 190 sqm contains about 40% fat ...

I also find that even 160 sqm houses appear bigger than this floor plan. However, the 190 sqm are not real living space. Maybe I’ll find alternatives this evening. Are you aiming more for 150/160 sqm? Personally, I would focus more on the south and not just place the house bluntly and straight on the plot as if there were nothing besides the large garden area “in the back”. Are the dimensions for the carport correct? And then also consider whether to separate the living room with a sliding door and assign the entire dining area to the kitchen. p.s. I consider the budget too low.

You do not place the house on the building line without reason.

Exploiting the height helps to use a larger knee wall or to build a genuine two-story house. Hence the question about roof pitch and knee wall.

The house could also be planned significantly more efficiently in terms of floor space if the height is better utilized.