Floor plan: ~150m² single-family house bathroom arrangement on the upper floor

Small update.
EG looks pretty good, so far I have tried to incorporate suggestions where possible.

OG is still pure chaos.

As a single level quite nice. For two people it is too tight. A 75sqm apartment would probably be more comfortable.

I don't like that the kitchen in your suggestions is always so separated from the dining table. It might be a matter of taste, but it's not practical. When you prepare something in the kitchen, you have to go through the hallway to get to the dining table. Think about that carefully...

no... this has really gotten worse while trying to improve it. The ground floor was already pretty good as it was. Except for the well-intentioned but simply impractical gimmicks in the bathroom.

Regarding the upper floor: I actually thought it was quite okay too. But there your main problem is that you want to tinker too much in the bathroom. I think you've seen too many model bathrooms in sanitary brochures ;) We had the same issue. We wanted to incorporate countless variations in the bathroom. In the end, it was all rubbish and we went with the proven standard. Sometimes you just have to realize that the proven standard has a reason why it’s proven itself.

And as 11ant correctly wrote: stop planning a house for old age at 35 and with family planning ahead. You yourself write that you don’t know what the future holds. Don’t plan a house for your uncertain last 15 years by making strange compromises in the 30 years before.

So: one house as one living unit. With a bathroom and a guest WC and everything designed to live on 2 levels.

And as 11ant correctly wrote: stop planning a house for old age at 35 with family planning ahead.

... and to reckon without the hostess! It is a frequently underestimated mortgage on a relationship when Jane is only allowed to choose the decor in Tarzan's house. Then five to ten years after her move-in, a divorce house hits the market (I don’t just make up the Barthel tips, the silent market lives significantly on such properties).

Thanks for the answers so far, but I do not want to go any further into the "Jane" topic.

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Gut feeling says the ground floor has improved, and the utility room can also be kept in full size.

I definitely need to take a closer look at the kitchen again, possibly mirror it once or set it back a bit with a counter.

I would like to keep the idea of the large study for now because I expect more usage possibilities than from a 50m² room.
Separating the dining room from the TV area also doesn't seem bad if the conversation topics diverge or when football starts ;)

Nothing has changed on the plan yet, but I am mentally considering removing the ceiling in the east (shower), basically a light space with a large window from ground floor to half of the upper floor. A bit less bathroom but I save the hallway up to one of the house corners. With a stylish staircase, it should also look good visually, hopefully privacy fits with the side facing the street and 14m to the boundary.
Now over Easter I will first be at the future building site (400km away).

I have now marked out (pink) a 9x11m house 10m from the street (trying to draw it in white). Boundary black on the right edge, left there is still the shed then parents' property.

I have meanwhile also received answers from the utility providers regarding connection routes:
Electricity: "doesn't matter"
Drinking water: 15m including house wall, directly from the street with max 1 angle
Sewage: 1.5m then shaft (this is also the case with all surrounding buildings)