Floor plan design single-family house 150 sqm - tips for improvement?

The door doesn’t belong there. You’re right about that. The washing machine and dryer don’t have to run during the 3 hours when the living room is in use. There are still 21 hours left. Many machines can be programmed with a delay or even via an app.

I would place the garage at the top of the plan

regarding windows and kitchen planning, the island could be equipped with both a cooktop and a sink, but both should not be too large so that there is still enough workspace in between (so a 60 cm cooktop and simply a 60 cm sink without a drainer (which is not really needed)) this way you have light from the side and the back could be fully built up with tall cabinets or you could have a niche for appliances like coffee machines and co.

I always need to see something like this visually once and unfortunately can't find a picture of it online.

I always get chills when I read about such degenerate mental movies. And I already said, it is probably an original - which automatically means example pictures will hardly be found.

A pergola is basically a nice thing so that you can get a bit of shade in the height of summer, but as I said, everything also has to visually fit together.

Because of the visual fitting together, that's exactly why I suggested it: just imagine an offset shed roof, the part over the terrace is the one with the lower "ridge"; over the house the roof is covered normally, over the terrace it stands as a pergola (i.e. on this side the rafters stick out naked, or partially the solar modules lie on them, which can also be used as shade suppliers). As a treat, one could continue the "pillars" between the living room windows as "battlements" of the terrace railing (I just wouldn't like a simple fence around the area up there).

(I wouldn’t like just a fence around the area up there).

Yes, there are certainly better options. Would you have any ideas if it were to stay like that?

here is a suggestion from me (I am a fan of simple building structures). if interested, there are also a few more dimensions. for now without windows

EG: Outside dimensions 11.50 m x 10.50 m 93.41 m² Staircase 2.20 m x 2.20 m (according to my staircase calculator this should work) I would place the garage at the top of the plan

OG: 7.00 m x 10.50 m 54.01 m² Storage room is omitted but there is enough storage space in the corridor

Total area 147.42 m²

Thank you for your work but I’m missing the storage option in the form of a room. I would never put things like vacuum cleaners etc. in the corridor. Upstairs, 14 sqm of corridor would simply be far too much!

I would never put things like vacuum cleaners etc. in the hallway. Upstairs, 14sqm of hallway would simply be way too much!

Having a separate room for the cleaning cupboard - of which there are stylish models - would not save any space.

Would you have an idea if it were to stay like that?

As a treat, one could continue the "pillars" between the living room windows as "battlements" of the terrace railing