Floor plan: New construction on existing bungalow basement, 1.5-story

Professionally drawn by our architect, it looks like this. What we would still adjust:

[*]Peninsula on the wall at the top of the plan instead of an island in the kitchen [*]Move the wall between the office and kitchen as well as between the hallway and living room 20cm further upwards on the plan [*]Reduce the window seat in the living room to 2.50m width [*]Floor-to-ceiling windows for hallway and shower/WC [*]Thermal insulation for basement stairs towards the inside of the stairs

Does anyone else notice something? Please ignore the arrangement of the bathroom fixtures; it is still a placeholder.

If the walls do not play a structural role for the upper floor, I would not move them. I would avoid floor-to-ceiling windows in all bathrooms. Also, in the small hallway, they are not necessary in my opinion. Better to use the space for a small sideboard as indicated. Between the living room and the hallway to the guest toilet, I would install a proper door. It looks tidier and feels cozier.

The idea behind moving the wall was that the tall cabinet row in the kitchen (planunten) would then align flush with the load-bearing wall projection (under the ceiling beam). It seemed more visually harmonious to me that way. On the living room side, we could also align the TV wall unit flush with the wall and then have a bit more space in the hallway for, for example, a sideboard, or simply a wider hallway. I wonder if it is currently too "narrow" and if 20-30cm more width here could work wonders. The structural engineering does not interfere with these walls.

Mmh, if you like it that way better - sure. The space in the mini hallway definitely makes it more appealing, but will there still be enough room for a sideboard? Maybe rather a 30cm wall shelf. I personally value the 4m wall distance in the living room more. That is my perceived minimum for a house of this size.

I don’t like such short walls just for delimitation. It usually looks a bit shabby and petty and takes away the feeling of spaciousness. It robs a corner of the beautiful line of sight along the alignment… I would have left the WC where the guest room is and put up a wall ([Sichtschutz], not a delimiting short wall) that provides support for a mirror or small dresser. We already had that and I would have changed little about it. This way the zoning is fragmented (my opinion), and if anyone ever finds themselves needing to use the room for sleeping, they have to cross the central community space, including grandma, who goes to bed earlier when visiting, or a sick house guest who temporarily avoids contact. For that there is now a second hallway, which also has to be artificially lit when you want to use the toilet.

By "wall stub" you mean the thick wall under the beam between the living room and dining room? For the structural stability it would be easier if we support the ceiling here. But you could also put a post, then the sight lines would be nicer. Between post and wall there wouldn't be much space though. Or you shorten the hallway to the shower/toilet. Then everything becomes more open. We are torn back and forth about how much zoning/perceived privacy we actually want in the living room. 2 builders, 2 opinions. After much back and forth, the kitchen and living room positions are at least set. So if the room at the bottom left of the plan would become the utility/storage room without a hallway again, you would always have to walk through the TV scene to quickly get the broom there. That was one of the reasons to do it this way (others: more spacious bathroom, better privacy for living/dining area, no need for an overly large utility room). Of course, you are right about the reduced privacy in the interaction between guest/sleeping and WC.