Optimizing the floor plan of a 150 m² house - Tips

Hello everyone,
we are planning the construction of a 150 m² house and are currently optimizing our floor plan... Actually, we are quite satisfied with it, but a little skepticism remains.
In the following areas, I am a bit unsure:
- Living room: Is the placement of the sofa very unfortunate? I would rather not rotate it by 90 degrees, which would mean placing the TV on the short window wall...
- Kitchen: Do you need a separate heating system or does the living/dining room heat the kitchen as well? I wouldn’t immediately know where to place a heater.
- Pantry: Can it be used in this form? Of course, the area with 60 cm width is not ideal, but maybe it can still be used for spare chairs or similar? Also, beverages, cordless vacuum cleaner, paper/plastic waste, baking pans... should find space here. Basically, everything that is not needed very often and/or is too bulky for kitchen cabinets.
- Bathroom upstairs: I would rather not clutter the large room with very expensive bathroom cabinets, so the idea came up to use the space behind the shower/bathtub. Is the space between the sink and bathtub/shower sufficient to occasionally have 2/3/4 people moving around? Otherwise, I am very enthusiastic about my idea. Previously, the sanitary fixtures were simply placed around the outside and there wouldn’t even have been enough space for a cabinet.

Anyone who feels like taking a look and wants to share their “two cents” – very welcome!

Thank you very much,
hemali


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The floor plan and dimensions are only rough, please excuse the uneven measurements!
Top is west, right is north, bottom is east, left is south
The fact that the windows are not symmetrically aligned above each other is initially negligible. The sides of the house are hardly visible, so it bothers us little whether it looks particularly harmonious or not.

Development plan/restrictions
Plot size: 800 sqm
Slope: no
Floor area ratio: -
Floor space index: -
Building window, building line and boundary: -
Edge development: -
Number of parking spaces: -
Number of floors: 1.5
Roof type: gable roof 45 degrees
Style: classic/modern
Orientation: entrance east, terrace west
Maximum heights/limits: -
Further specifications: -

Requirements of the builders
Style, roof shape, building type -
Basement, floors: no basement, 1.5 floors
Number of people, age: 2 adults, 2 children (2+5)
Room requirements on ground floor, upper floor: as in floor plan
Office: family use or home office?: no, files in utility room
Overnight guests per year: negligible
Open or closed architecture: semi-open kitchen
Conservative or modern construction: -
Open kitchen, kitchen island: semi-open kitchen
Number of dining seats: 6, expandable
Fireplace: no
Music/stereo wall: yes, preferably whole wall with storage
Balcony, roof terrace: no
Garage, carport: no
Utility garden, greenhouse: no
Further wishes/special features/daily routine -

House design
Who is the planner: originally developer, individualized by us
What do you especially like? Emergency shower ground floor, pantry, large utility room, masonry shower upstairs, large bedrooms, storage room upstairs
What do you not like? -
Price estimate according to architect/planner: not relevant
Personal price limit for the house, incl. equipment: not relevant
Preferred heating technology: gas boiler + solar with 400l water tank

If you have to do without, on which details/extensions
- can you dispense with: -
- can you not dispense with: -

Does the staircase fit?
What kind of pantry is that?
I think I would paint that and instead make a door from the hallway into the kitchen.

Thank you for your opinion.

Yes, the staircase fits - I took it from the original plan. I didn't draw it upstairs, but it is logically in the same place.

Well, the pantry arose from the idea that the distances between the kitchen units of 2.40 m might be somewhat overestimated and the kitchen with the many cabinets didn't look nice... We really like the current kitchen layout a lot, and actually the pantry as well. The 60 cm "corridor" is admittedly a bit suboptimal, but we will surely find some use for it.

But the rest of the pantry with 1.25x1.77m is usable, or is that too small to store anything? I'm not very familiar with pantries...

The 60 cm are not walkable at all.
Your storage space behind the bathtub isn't either, as the wastewater pipes will run there anyway.
50 cm for the shower entrance is also not feasible.
The installation wall for the toilet and installations is completely missing.
There is no room for a reasonably sized wardrobe in the bedroom, and the access to the living area past the sofa is suboptimal.
There are no load-bearing walls at all.
And kitchen tall cabinets are also 58 cm deep and must therefore be drawn with 65 cm in the raw construction dimensions.
Wardrobe and laundry means: dirty shoes next to the white laundry.
Much too complicated and long a slalom path to the kitchen or pantry.
I would say: quite a few things went wrong when individualizing the planner's draft. The design, probably a standard floor plan but supposedly functional, is botched.
Unfortunately, I have to take away your enthusiasm.

if that is not relevant, why not let a professional handle it?