135 sqm single-family house with gable roof floor plan evaluation / improvement suggestions

This drawing reminds me of the brochure floor plans of some Roompot houses in De Banjaard. Suitable for one or two people, definitely quite livable for those with little "unnecessary" stuff. Technology decentralized air conditioning - heating units and tankless water heaters?

First of all, thanks for your contributions!
Here is the floor plan with dimensions.
Regarding the cardinal directions: believe me, there is hardly any other way due to various circumstances. Ideally no windows to the east because it is not desired by the neighbor or us, to the south there is a street with little traffic, which is also where the driveway is located. On all sides there are dense, very tall trees, so you only get diffuse light anyway. I would rather not post the site plan here for data protection reasons, thank you for your understanding.
Bricks: personal preference and common in the village, I can get them cheaply
Ceiling height only 3m downstairs, also a personal preference, in the upper floor knee wall 1.6m, maximum ceiling height in the open roof peak approx. 4m, roof pitch 32 degrees, seemed the most aesthetic at first glance
Development plan: basically no restrictions except 1.5 stories, (but flexible, since necessary living space for the calculation is added on the lower floor by the conservatory. So theoretically 2 full stories also possible, but gable roof is a personal preference, customary in the area and cheaper)
Utility room actually small but seemed like an okay compromise to me in order to have more space in the living-dining area because many people should also fit there. Building technology compact heat pump (space requirement inside similar to a refrigerator), no photovoltaics, central ventilation system in the intermediate ceiling,
Personal situation: currently a single household, but should also make sense for a small family in the future
Regarding the room layout upstairs: feel free to give me suggestions for a more efficient room layout that still includes 3 bedrooms. For now, rooms 1 and 3 will probably be without a partition wall since they are not yet needed. I just noticed that I have limited myself in wall design due to the 3 windows on the gable side. If these are replaced by 2 larger windows, the wall can also be placed more centrally, which should fit better. Things like dressing rooms I would not wall in to remain flexible later in room layout if, for example, a children's room or something else is created there. Do not exclude topics like dressing rooms but that would be an optional step with light construction or furniture.
Storage space: I agree with you, also because of the lack of an attic, 1. I don’t need that much anyway, 2. there are possibilities for built-in cupboards, 3. the built space is too expensive for me. If space is still needed, it can be provided in the garden or in the carport in heated, clean rooms.

My main concern is the everyday usability, (affordable construction costs) and the living comfort of the floor plan, so basically how I should position the walls, stairs, windows, etc. A thorn is, for example, the entrance to the stairs on the ground floor through the dirt area of the front door, so you always carry dirt in both directions, but with the size of the house, little traffic area and a possibly large living dining cooking area, I did not come up with a better idea.

Unsorted thoughts:

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First of all, thanks for your contributions!
Here is the dimensioned floor plan.

- I am almost certain that the utility room cannot work. The second door further reduces the usable wall and storage space of the already minimally small room.
- I fear that the lighting effect, especially on the upper floor, will be really bad. Some rooms only have roof windows. From which you can hardly look outside either. That will feel like prison cells.
- On the upper floor, the indication of which room is to be used how is still missing. The extremely elongated room could quite well serve as a children's room, but would not be practical as a master bedroom.
- There are many decisions here that I consider worth reconsidering. Examples:

Regarding the cardinal directions: believe me, it hardly or not at all can be done differently due to various circumstances. No windows to the east because of the neighbor and undesired by us, to the south is a hardly trafficked street, from which the driveway also comes. On all sides there are dense very tall trees, so you only have diffuse light anyway.

So what? Even looking at trees or a street is nicer than having rooms (upper floor) completely without windows at sight level that you can look through.
So either lower the knee wall and install roof windows through which you can look outside. Or raise the knee wall and install windows through which you can look outside. Or windows on the east wall.

Clinker brick: is personal preference and common in the village, I can get it cheaply
Ceiling height only 3m downstairs, also personal preference, knee wall 1.6m on the upper floor, maximum ceiling height in the open roof peak about 4m, roof pitch 32 degrees, looked the most aesthetic at first glance

If your finances are very tight, then all of that is luxury and causes a whole chain of problems.
- storage space is missing.
- the utility room is dimensioned much too small.
- the light/window concept on the upper floor is, from my subjective point of view, questionable.

Development plan: actually no restrictions except 1.5 stories, (but flexible since the necessary living space for the calculation is added on the lower floor via the conservatory. So theoretically also 2 full floors possible, but gable roof personal preference, customary in the village and cheaper)

2 full floors and a gable roof are possible.
Conservatory not drawn in.

Technical room actually small but seemed like an okay compromise to me to have more space in the living-dining area since many people should fit there. Building services compact heat pump (space requirement inside similar to a refrigerator), no photovoltaics, central ventilation system in the ceiling void,

Meter cabinet, house connection cabinet, depending on the federal state also mandatory photovoltaics (means inverter), and so on... 6m² is enough with a compact heat pump and little else if you have one door (!). The second door effectively (because less wall and storage area) takes away at least another, rather 1.5m². That means: the utility room here is comparable in usability to a 3.4-3.9m² room. Too small.

personal situation: currently single household, but should also make sense for a small family in the future

Okay. And now simply consider it from the perspective of a couple:
Where should everyday stuff be stored? Like vacuum cleaner? Cleaning supplies? Ironing board? Washing machine? (The washing machine will not fit in the mini utility room.)
Where should things be stored that you should keep a certain stock of (even just one pack of toilet paper needs to be stored somewhere and requires space)?
Where should things be stored that you only need every few months (decorations, suitcases, etc.)?
Of course, you can live minimally; however, vacuum cleaner and such still need a place.

Storage space: I agree with you, also because of a missing attic, 1. I myself don’t need that much anyway, 2. there are possibilities for built-in cupboards, 3. the built room is too expensive for me.

The question here is not what you yourself need. If you are building so that a family will live there at some point, then a certain family suitability is needed. And then the question is: What do you need then?

And based on that question, you design the house.

There are after all tens of thousands of floor plans in brochures, on the internet, and elsewhere that basically suffice for ordinary demands or can still be adjusted locally/individually, so why then want to reinvent such a "floor plan"? I can only agree with the previous speaker and would also advise you to use paper and pencil; the drawn-in furniture is probably not to scale, which makes evaluation increasingly difficult or impossible. Looking at the ground floor, I feel no sense of well-being, the same applies to the upper floor. This was simply a game of Tetris, but not really planned from the ground up according to needs. Be it the entrance area, the missing storage rooms, utility room, bathroom layout, guest toilet, and much more—in my opinion, this can go straight into the recycling bin and a m

after I already seriously screwed up with it once and was (rightly) torn apart in the air, I would like to experience the trauma a second time

I don’t know the backstory, but what do you think you have "improved" compared to the previous attempt? It is simply not everyone’s thing to get a good floor plan onto paper.

A 5m² HAR is sufficient for the technology, but not for much more. It is then a HAR, not a utility room, even for a washing machine and dryer it can become cramped.

Yes and? Looking at trees or at a street is also nicer than having rooms (upper floor) completely without windows at eye level through which you can look.
So either lower the knee wall and install skylights through which you can look out, or raise the knee wall and install windows through which you can look out. Or install windows on the east wall.

Exactly, see also "How the knee wall influences the window question in the attic". The sun rises in the east, no matter how stupid the neighbor is.

I don't know the background story but what do you think you have "improved" compared to the previous attempt? It is simply not everyone's thing to get a good floor plan onto paper.

The situation has improved significantly and substantially (from a 212 sqm house without land to a 135 sqm house with land), but the planning talent of the OP has not changed decisively. I cannot understand the desire to do it oneself here. Apart from that: a floor plan set does not make more house than a swallow makes a summer.