Single-family house with flat roof bay window - feedback, bathroom planning, color design

I don't think the draft is bad. The only thing I would shorten is the half-height wall in the living room. It’s just annoying – the maximum length would be the stop of the living room door. Or close it completely and put in a double sliding door. Best to go through the 3D view with the planner once.

..., that the attic doesn’t work.

Unfortunately, I can’t understand what means here. What exactly doesn’t work? I only see the floor-to-ceiling cabinets under the slant in the kids’ room as nonsense – but that’s probably just a copy error by the draftsman.

Under these conditions
... I see no need to restrict standing height so much.

There’s probably still room for improvement here – but I also don’t see a major "restriction."

I find the technical room sufficient. I think bathroom 1 is okay. I would only place the bathtub crosswise under the slope.

I clearly have a déjà vu here with the majority of those attics that we usually discuss in cases of full storey avoidance or Franke knee wall cases. Despite a knee wall nominally almost 140, 30% of the floor areas lie in the U-200 range, although the development plan would allow a full and even straight-wall! attic. Drawing the closet on the eaves side in the floor plan is a very cheap trick. I would send the planner into the desert, and indeed into one with particularly hungry lions.

Despite a knee wall nominally almost 140, 30% of the floor areas are in the U-200 range here, although the development plan would allow a full and even straight-walled ! attic.

It's not about what is maximally structurally permissible, but what the builder wants. Therefore, unfortunately, I don't understand you. The builder obviously wants a house with a gable roof and roof slopes. And now?

The builder obviously wants a house with a pitched roof and sloping ceilings.

For coziness, you can also add gingerbread scent to the controlled residential ventilation, so a pitched roof is not necessarily required.
When thinking clearly, one does not build a less usable space than necessary.

It is not about what is maximally permissible structurally, but what the builder wants.

My impression is rather: the provider is looking for a solution where the price appeals to the builder, and only the color does not. Simply because that is the shorter way to the contract than the other way around.

Much has already been said, so I will just add a few supplementary remarks:

Instead of the relatively large bedroom, I would carve out a small utility room for laundry upstairs. But it depends on what you do in the bedroom. We only sleep in there – so you just need to fit a bed in, and nothing else. However, I have also met people who iron in there, etc. Then it’s different, but if I only sleep there, I don’t need a ballroom (unless I have a 300 sqm villa), and would rather use the space better.

If my old eyes don’t deceive me, you are planning the Paiova bathtub from Duravit. We also thought it was great because we sometimes want to bathe together – until we tested it in a bathroom showroom (just sitting in it – without water). You can forget the idea of comfortably bathing together. From the waist down you lie on top of each other – and we’re not unusually fat. The advertising photos from Duravit are misleading – comfortably together is something different...
In the end, we decided on the Bette Free 2mx1m. You don’t lie side by side in the bath but sit facing each other. The drain and overflow are in the middle, and both ends are designed so that you can really lie comfortably in both directions. We’re glad that our sitting test ultimately made us move away from the Paiova.
I strongly urge you to go to a bathroom supplier and try "sitting in" the tubs, preferably with pants without rivets to avoid scratches.
But there are really many bathtubs that look great but where you sit so terribly that bathing is no joy.

Where are you building? I fear you won’t make it with 360,000 € – or have you planned such a high share of personal contribution?

Unfortunately, you have not completed the questionnaire fully, so it is difficult to guess whether 1 child is planned or not. Whether there could also be 2 children, whether you often have overnight guests or not, etc. All of this has a decisive influence on the room planning.

So only general statements are possible – and nothing that addresses your particular living situation.