House design city villa, 2 full floors, double garage

On what basis did you then qualify the decision to want one meter more width – without measurements, that's just guesswork (?)

The draft is at a scale of 1:100, meaning the measurements can be taken accordingly. What I meant is that we don’t yet have a draft where the measurements are properly indicated. Since our current draft has a depth of about 3m in the living/dining room, we initially considered making a cuboid in the living room to get to a depth of about 4m. However, we decided against the cuboid and rather said we would extend the house by one meter to enlarge everything a bit. (Ground floor as well as, of course, the upper floor) Sorry for the imperfect details. What do you think about the draft otherwise, how do you like the layout? Or would you have other suggestions?

at first we considered making a cube in the living room

I don't understand a word.

What do you otherwise think of the draft, how do you like the layout? Or would you have other suggestions?

I didn't recommend reading those from without reason. Just google through their thread history, earlier it was Wanderwetter, and soon comes a vränggischer Dadord - otherwise I'm more servile there
In my opinion, you can't discuss layout detached from absolute dimensions, so I'd rather wait for the new basis for discussion. Adding a meter below across the board with the "collateral damage" that the floor above then also has more space is an attitude for very thick wallets (and by that I specifically mean the compartments for platinum cards).

The plot has a width of approx. 24.5m

Lots of potential in the width that is not being utilized here!

Since our current design has a depth of approx. 3m in the living/dining room, we initially considered making a cube in the living room

What is meant by that? A cube is a 3D shape... did you want the living room width/height/length all the same? What nonsense! As far as one can tell without measurements (I would have also roughly estimated the 3 meter room depth in the living room), two evils are built in here that cannot be improved easily or by just a small extension: the central pantry and the second hallway (passage garage/house). The latter is, as in many designs, unnecessary due to the proximity of the front door to the garage door, and is also a space-waster in the small house and small garage. How one is supposed to get past the car escapes our understanding due to lack of measurements. Why the most energetically important place in the house, namely the center point, is built into a storage room can only be explained by the builder or planner having put themselves into a corset of "kitchen window to the street," "living room to the back," and "passage to the garage." These priorities should be reconsidered mentally. At the moment there is a mega kitchen that would fit a country house, but it is very step-heavy and not ergonomic. If a professional (architect) drew this in, they should please reconsider what they find in their profession.

What do you particularly like? Why? The open living space

I do not see that here at all. I do not see it even with a 2 meter extension. The pantry takes away any generous connection. Unfortunately, there is no independently drawn site plan with the house on it. I think that if the builder did their homework here, they will see that a wrong house has definitely been planned. The house currently has the dimensions and thus all the disadvantages of a semi-detached house: narrow hallway, non-ergonomic kitchen, too small living space, space-saving staircase... I tend to a fresh start. (Kitchen and upper floor not considered)

On what basis did you then qualify the decision to want one meter more width - without measurements, that's just coffee grounds reading (?)

Why do you need a "basis" for that? It's not coffee grounds reading, but a very simple decision. Of course, it makes sense to look at the upper floor again when enlarging the floor plan and to discover new possibilities.

What do you need a "basis" for?

Well, you have to derive from some factual basis that an extra meter here would bring salvation. As a manufacturer of panel vans, one might be satisfied with simply giving the three-and-a-half-tonner a longer wheelbase than the two-point-eight-tonner – but when it comes to the family’s house, I would consider a more differentiated approach appropriate. Simply increasing an estimated measurement taken from the floor plan scale by +100 and believing "that's it" is hardly something one can take seriously (?)

My impression, a typical messed-up general contractor architect’s design.

The conversation went something like this:

- Hello, nice that you... yes, would you like some coffee blah blah
- Individuality is important to us blah blah you can change everything
- What do you want, what is important to you, what can it cost?
- Answer: we like city villas, the man wants a garage, but the woman wants direct access because of groceries and oh yes, a pantry as well. We need a basement because of xyz and hobbies. Oh, and the woman absolutely likes corner windows facing the street because she saw that at a friend’s, and upstairs, well, two children’s rooms and a nice big bedroom and a bathroom with a T. We’ve always wanted that. Yes, and we also have a budget.

- Yes, look, with our endless creativity I have here a draft 17b, how do you like it?

- Well, there’s no pantry and no entrance through the garage

- That’s why you’re with us, we stand for individuality... look, we make the living and dining room a bit smaller (in his mind, he’s already getting the price list for expansion and/or bay window) and that’s where the passage to the garage goes and yes, the pantry, well, we just make a little square right in the middle. Now we’ve accommodated everything, right?

- Uh, yes

No offense, it’s very tongue-in-cheek and not entirely serious or malicious, but I almost hope it was like that because hopefully no one thinks this up freely.

The sink and stove don’t have to be there, I understand, but measure the meters... grab something from the pantry, walk to the sink to wash it, then chop it, and then to the pot... heart rate at 180 unless you’re training for an ultramarathon.
With 1m more, the upper floor becomes even bigger or another design.
I’m also inclined to recommend starting over again.