Design for a single-family house with 160-180 sqm - suggestions for improvement?

That was already suggested anyway - we're going in circles...

Yes, but I don’t see a solution to the problem or I don’t understand it. We don’t want a spiral staircase but either a straight one or one with a landing. And the basement should actually be cold as a pure utility basement or it shouldn’t cost more. A staircase with a landing and a door seems even stranger to me than two separate staircases, or am I seeing that wrong?

How does the size of the living room fit with the corner now?

The technical room must be frost-free and remain so. Can you achieve that without including it in the thermal envelope? Do you want storage space where it might possibly freeze in winter? You have to insulate the stairway including the door. Is it really that much cheaper? You can’t even overwinter plants if it’s not frost-free. What about the moisture?

Yes, but I don’t see a solution to the problem or I don’t understand it. We don’t want a spiral staircase but either a straight one or with a landing. And the basement should actually be cold as a utility basement or it won’t save money. A staircase with a landing and a door seems even stranger to me than two separate staircases or am I seeing something wrong?

How does the size of the living room fit with the corner now?

That’s why there are architects who have been trained for this.

The room in the basement where the stairs run is indeed large, but you can really only build a shelf along the outer wall. What is the room planned for?

We don't want a spiral staircase but either a straight one or with a landing.

Why? It's not really highlighted in the basement anyway.

A staircase with a landing and a door seems even weirder to me than two separate staircases, or am I seeing this wrong?

It's not the staircase that gets a door, but the room the staircase leads to.

How does the size of the living room fit with the corner now?

Raw dimension 2.99? My sofa wouldn't fit there. You have the smallest Ikea emergency sofa for kids drawn in after all.

The room in the basement where the stairs run is quite large, but actually you can only build a shelf along the outer wall. What is the room planned for?

There really isn’t any use for the room; I would have preferred to build without a basement and have more space instead, but that’s not really possible due to the hillside location.

I just find a spiral staircase annoying to use; you always have to be careful to catch the steps; I find that rather difficult as you get older or with children.

Does a basement cool down that much? At friends’ old house, the heating is also in the basement and the house is from around 1900 or so; the basement is open because coal used to be brought in there.