House on the slope floor plan fine-tuning

-you can do without: setting up the basement office as a granny flat, but it is desired due to tax aspects.

Ah, here it is. I got a bit stuck on the views (granny flat entrance) and the non-compliant basement floor plan.
So, I have to say: I really don’t like the floor plan.
You say it is an architect’s design.
Then I assume that the unnecessary small corners or niches are due to tracing and will not go into that further.

Who is responsible for the planning: architect – adjusted again by me internally

(I hope your specifications or your improvements are not the reason for the smaller faux pas)
(Note: already written at 2:00 pm)

Honestly, I don’t warm up to the room orientations and/or the floor plans.
The house may be a matter of taste, but you usually see these projections above windows in South Africa or something, to keep the sun out of the rooms.
But I’ll focus more on the floor plan:

and towards the north you have a great view into the green valley.

Why is there nothing of that in the upper floor? Except in the bathroom and the children’s room?
If the view is so great, then I miss it when going upstairs. Also because, understandably, the basement gets elevated, one should rather rotate the stairs as well to catch the view.

I fell in love with this kitchen bay in a model house,

What can the kitchen do more or better now than if you pack the kitchen without a bay into the floor area? If you put the kitchen inside the house, you would enclose it with walls and possibly could do without the support column in the middle of the room. The effect would be the same.
The tight 75 sqm open plan is furnished with large furniture, but something like coziness while watching TV with the family probably doesn’t come up. The dining area is, in my opinion, pushed too much into a corner. You have to know if you are happy with an island only 120 cm deep, just like the panoramic window of the child facing the street, so everyone can look in there. I think there’s too little thought put into that.
Just like the southwest side for bathrooms, utility room, dressing room. It’s like pearls before swine...
Then there are doors with 80 cm width, although the rooms are already very big and tall. That somehow doesn’t fit.

I also find the basement poorly thought out. You enter the office through the fitness room. You can do that, but for the house size one should have more logic.

I would position the stairs more centrally but rotated. Also so that there is still daylight/view for the stairs in the upper floor. Currently, it is only a corridor hole. Then mediate the open plan between terrace side and sunny side.

To better mediate the space conditions on the floors, possibly move the bedroom to the living floor. What the upper floor lacks, the ground floor has too much of.

That somehow seemed that way to me too. Is the parents' house also located on the slope next to relatively small houses?

The house of the lower neighbor is huge and takes up almost the entire plot. Our plot used to be their garden. Therefore, the house below basically has no garden now. Ours just looks bulky from the street, but there are also 2 apartment buildings on the street. So the surroundings are quite mixed.

So .. I once again notice the staircase .. it is not comprehensible at all. On the ground floor and basement apparently with a winding shape, on the upper floor no longer but each time in the floor plans in a slightly different position. And when I then read the clear room heights... hmm.

Yes, those American-style walk-in closets can be nice and practical. But only if, like in [Kind 2], they practically disappear into the wall. Although I think the size of [Kind 2]'s closet is really not very generous. Basically, it is a 125 cm wide closet. And [Kind 1]'s is cut even less favorably.

The washbasin in the master bathroom is not well placed relative to the windows. Ideally, there should be side lighting.

On the ground floor, I also don’t find the dining table position particularly cozy. It’s practically like sitting in the stairwell.

In the basement, the office with the strange stub and the window that can’t be a window. Your husband should try that out. Such a windowless office is really a mood killer.

So, unfortunately, a lot is aspired to here, but it’s not well-rounded.

Sorry, I forgot my closing sentence… Par 34 applies, as far as I understood Escroda correctly back then, only to the shares of the house to the property. Appearance or roof variants are up to preference.

For a million, you should think through the house much more. It seems to me that this is an initial idea.

possible future 3rd child

Where is the possible 3rd child supposed to live? I am currently stuck on the 38sqm parent area, where three children's rooms would fit well.

It seems to me as if this is an initial idea.

On the contrary, it feels to me as if the "spirit" of an approved previous owner plan is to be "saved" here at all costs or at least is something the current builder cannot get out of their mind. The result is the maximum entanglement of this "basis" – in other words, patchpatchpatch (the opposite of Clean Code). The consequences for the MTBF are often underestimated. Genetic pathology.