Floor plan of a single-family house approx. 170 m² on a narrow 750 m² plot

It's just not that simple with symmetry.

I wouldn't pay attention to symmetry. Much more important is that you feel comfortable rather than how it looks from the outside. But I would definitely place the garage directly attached to the house. The utility room at the upper right practically screams for that. You can also go around the house on the left side to get to the garden. Otherwise, I find it important to have the guest toilet near the entrance. If you have to quickly use the toilet from the garden, you don't want to have to go through half the house first. We have that now and it’s really annoying. I would put it where the pantry is now, then shift the pantry and kitchen somewhat downwards, and move the seating area a bit to the left. That way you get more space in the living room and can place the sofa against the upper living room wall and also look out the window sometimes. As you planned it, the space where the dining/living area is seems too empty and unused to me, while the living room is too cramped.

I have attached another picture for the placement of the terrace.

In the configuration with the terrace between the street and the house, but the garage then behind the house just before Siberia, I would call offside *LOL*

but rather that the knee wall is at 1.2-1.40m. I know houses where there is almost no knee wall at all and the rooms become much smaller as a result. We want to avoid that.

We have 1.30... not much. There are definitely sloped ceilings. You wrote that you want to manage as much as possible without it. Why don't you plan with a 180 or 200 knee wall?

With the symmetry, it's just not that simple.

Yep. Because that is taken into account in the planning.
The house, the design, has not become better overall through your hand, nor is it suitable for the plot.

You want to sit on the street side? Okay...
Admit it: you basically want to reinvent the wheel! Garage in the back, terrace in front. Are you sure this is your plot? :cool::p

If I have time tomorrow, I will give some more thought to the floor plans of my 8*13m house.

As you can see from my [Grundstuecksentwurf], the terrace on the west side works quite well. I am also further north and the house is 2 m narrower, so the terrace even fits into the building area in the south. By the way, my house is to scale on the [Grundstück].

I would definitely place the garage directly next to the house. The utility room at the top right practically calls for it. You can also go into the garden on the left around the house.

However, the utility room at the top right is wrong there. The top priority: short routes for supply lines. The cards need to be reshuffled here. You would get your utility room passage to the front towards the garage ;) I can understand if you don't need that.

about the floor plans of my 8*13m house.

Yours?