Floor plan design single-family house approx. 160 sqm

The staircase has to go from one floor to the next, so it has to overcome the room height plus ceiling thickness. Approximately 260 cm raw construction height still seems sufficient to me, although many builders today find "more" more modern. With 20 cm ceiling thickness, you can (without underfloor heating) manage structurally, but currently no longer in Germany. Is there no equivalent to our "Energy Saving Ordinance" in Austria (which is actually a government initiative to store petrochemicals in residential buildings)?

What would you consider the next sensible step?

If you've overheated while designing the floor plan, the most sensible next step is cooling down. So first, don't plan any floor plans for several weeks and don't look for any elsewhere either. Bake cookies, go for a walk, glue flower petals made of tissue paper onto cactus spines, or translate the theory of relativity into feminist speech.

When you return to houses after several weeks (!) of abstinence, then at first not to floor plans. After several more weeks - then it’s around Easter - come back to floor plans - but they have to be new. Don’t refine old ones!

So no moving individual light switches – and don’t forget: if you relapse, you "end up" like StanSch

Oh, I see. You mean the floor height of 2.70m - that would even be a bit tight. The 3.60m staircase is for a floor height of 2.80m - ceiling height then probably somewhere around 2.50m. A 4m staircase would rather be for a floor height of 3m.

Here is another proposal from Kampa (show house Vienna) with a remodeled upper floor. It would still need to be mirrored. Also the question whether the storage room under the stairs is too small.

We have exactly such a utility room next to the stairs, with the space under the stairs also serving as storage. You can fit quite a bit in there.

We have relapsed, and that already after the first day!
Based on the floor plan posted by , which we basically like quite a bit, we have put together the following.

This largely corresponds with what @ designed, but was done independently of that!

We still do not find the bedroom optimal, we are currently tinkering with how to get the bed on the other side so that we do not have a window behind the head.

One could simply place the window towards the bottom of the plan and leave the bed there.

Is a platform staircase desired? Or just a normal spiral staircase?