Single-family house 175 sqm without basement, too big?

We want a generous living feeling with large window areas.

I don’t see that. Unfortunately, I haven’t followed this thread, or rather, I got up to the teenager stage and now I’ll just jump in here with a few comments. Inside, what first strikes me is that due to the sofa position and relatively short office wall, you don’t exactly look cozily into a corner towards a dark hallway. As a result, upstairs there is a dressing room that, with two doors, has more walking space than it deserves. The proportions simply don’t match the use. The window centered on the garden is framed by “too much wall” on the left and right. A side corner window won’t change the wall setting either. I don’t like the size of the stair window there (also as an interior view) at all. A window like the toilet window (with a proper parapet) would fit better. Also with the toilet: I have a doctor in a new building with exactly such a floor-to-ceiling window in the toilet – that’s just n.o.t. allowed! Even if the thing is frosted... That would also straighten out the exterior look. But I’m still on the ground floor: Kitchen: again dithering around the island, and no space for sand-lime brick, stove, and utensil cabinet at eye level. Instead there is direct terrace access. I would forego the latter because there is a chance to exit in the dining area and put the kitchen furniture against the outside wall. However, I would also try to get into the kitchen earlier. Probably I would swap kitchen/WC and office/utility room and dining/living room. Then dry laundry in the east and small retreat terrace in the living room in the southeast (floor-to-ceiling window). Then the dining area would open generously to the southwest garden (2 x 2 meter terrace door area). Upstairs there is a placeholder room, right? I would move this dressing room under the roof in the southwest and mediate the placeholder children’s room. Basically, the windows upstairs look too clumsy to me. I would definitely plan with parapets and shift the windows somewhat toward the ridge. I definitely wouldn’t build without a bathtub. You can also use it for kale or dyeing if you think your bones or muscles will never get old. Otherwise, I quite like the house style and the orientation. Is the slope a problem?

Wow, so much input at once! Thanks for that anyway, I'll try to work my way through it:

1. Sofa position / dark hallway: I hadn't considered so far that the hallway might be perceived as a "dark hole" when sitting on the couch... A longer office wall is out of the question because the room layout is generally already desired as it is. What comes to mind spontaneously: If it really bothers someone later, one could install a drywall with a door and thus separate the hallway from the open living area?

2. too much walking space in the dressing room: I don't quite understand the criticism? For many, the dressing room is the only access to the bedroom, master bathroom, and the dressing room itself. There are then three doors and more "traffic" than in our plan. If we only place two straight wardrobes, we get 4m of wardrobe length, with a U-shaped arrangement even more. Maybe you could explain this point to me in more detail?

3. too much wall around the centered living room window: I understand well what you mean. But I also see with others that windows are repeatedly blocked by sofas, which I also don't like... Spontaneous idea, which would also change point 1 a bit: swap the sofa and TV? Then you wouldn’t look into the hallway from the sofa and could theoretically build another window to the right of the TV? On the other hand, my original idea was that the sofa area should be bright but not "bathed in glaring light," as it is meant to be more of a cozy corner...

4. dimensions of the "stair window": Unfortunately, I don't understand this either. It is supposed to be a fixed glazing since the window is above an open space, and I always find it somewhat ridiculous when window handles are present where you cannot even reach the windows to open them. So what would a parapet help there?

5. window in the toilet: Yes, I openly admit that this is a sticking point. The bathroom is currently also being planned by a professional, so window changes could still occur. The background of the current plan was that you have light from two sides, ventilation of the toilet area, and general cross-ventilation in the bathroom. We thought that we could just use pleated blinds if it bothers us too much.

6. kitchen window: We probably want to create two terraces and not one large one as shown in the plan. As a result, there would be one terrace at the kitchen and one at the centered window in the living room. The exit at the dining table would then lead at most to a path connecting both terraces. Hence the idea to replace the window with fixed glazing.

7. kitchen layout: Tricky topic! I had also considered placing kitchen furniture against the outer wall (aside from point 6), but the distance between these and the furniture on the stair wall would then be 2.30m, which doesn’t seem very pleasant to me. We had initial talks with two kitchen studios and I am currently optimistic that we'll get a good kitchen design for us, even though the floor plan seems like pure horror to everyone else.

8. room position: I didn’t fully understand what would be where for you, but I believe the sofa would be in the current kitchen? I have already tried that in planning once and I didn’t like it, especially my partner didn’t... The technical room should stay at this position anyway to keep the cables from the street as short as possible.

9. windows upstairs: What do you mean by too bulky? You find them too big? I have never heard anything like that before. I find parapet windows in bedrooms look outdated when you could have floor-to-ceiling windows...

10. bathtub: We had a freestanding tub and sold it at some point. I wish anyone who needs a tub to have one, but we neither need nor want it. For any potential clothing dyeing (which I would prefer to do in a disposable laundry tub anyway before risking ruining half the bathroom) I definitely would not install a bathtub.

11. slope: As laymen, we currently have the impression that it’s not a problem, even though we hear otherwise often here... Many neighbors want to dig out or fill in, so it’s easy to get earth for filling. But probably I see that too lightly.

I am sure I’ve forgotten half now, sorry!

I would definitely provide a sliding door to the terrace in at least one place in the living area.

What advantage do you think that would bring?

I have now read through everything and realized that I have actually already written something, for example on the topic of windows in the pantry.

Yes, the thing with the pantry gives good food for thought... So far, the idea would be to put a freezer in there and otherwise fill it with shelves, but in which a toaster, a kitchen machine, etc. should also fit.

You don’t put a toaster and a kitchen machine on a shelf, you put them on a work surface. Shelves are good, but it doesn’t have to be full of them. A shelf with a work surface, with a window above it. Not for ventilation, but to have daylight in the room!

But we would actually need a passage from the dressing room to the bathroom.

Not necessarily with this room layout: just generate the door to the dressing room from the hallway... then you also benefit from the bathroom, because at the moment you have too much circulation space through two doors and no real “room.” It’s also crappy to always have to take this detour through the bedroom when you just want to quickly put something on.

So I find the ground floor quite good. Ok, I tend to switch the stairs to the other side so that you get to the kitchen more quickly with grocery bags.

Me too!

A longer office wall is out of the question because the room layout is generally already desired as it is.

That’s why the idea to mirror the rooms themselves. But ok... it would also work that way if you play around with dimensions 3 meters and 3.5, just swap them.

For many, the dressing room is the only access to the bedroom,

It doesn’t matter how it is elsewhere... most still have a “trapped” and therefore impractical dressing room. But you currently have a similar problem because you can’t just get to your clothes directly. If you made it independently accessible from the hallway, you’d also have more peace for the bathroom session.

Too much wall around the centered living room window: I understand well what you mean. But I also see with others that windows are often blocked by sofas, which I also don’t like...

Not always the others... sofas nowadays have a nice back, and if there is space, then better a footboard in front of a window than not. Such a sunny spot is coveted!

So what would a parapet window help there?

Ask yourself that in the living room

I find parapet windows in bedrooms look outdated if you have the option for floor-to-ceiling windows.

They don’t if the window itself is wider than it is high (like in your office, that is a style break and outdated).
A parapet offers protection. By the way, space to place a dresser. But especially a southwest-facing bedroom is unbearably warm in summer if too much sun shines in.

10. Bathtub: We had a freestanding tub and eventually sold it.

I’m not talking about freestanding either... I would sell that too

Position of the rooms: I didn’t fully understand 100% what would be where with you, but I guess the sofa is supposed to be in the current kitchen? I also tried that once in the planning and I didn’t like it, especially my partner didn’t... The technical room should stay in its position anyway to keep the lines from the street as short as possible.

As already said, swap 3 meters with 3.5... I don’t have the time right now to draw it... maybe the next few evenings.
3 meters for the kitchen, which can then be accessed from the hallway, just open/omit the wall where the stairs are... you don’t need one. Then arrange the furnishings so you go into a U.

P.s. Utility room with window – for lighting.

And I would plan the sofa along the interior wall and want it to face towards the exterior wall or window