What should be considered when designing stairs / differences in the winding?

Hello,

Do you have experience with 1/2 spiral staircases regarding the dimensions?

I have - to be honest - never measured that :D

But according to the staircase builder, the area required for a ¼ spiral staircase is 9.2 sqm of circulation space.

Rhenish greetings

Now a really silly stair question: But is it possible to install a half-turn staircase from the ground floor to the upper floor, but a quarter-turn staircase from the ground floor to the basement? Or is that a structural problem?

And which step width do you find comfortable? 113.5 would be possible for us, maybe even 126cm.. we are still quite unsure about that. Step depth is currently at 27.5cm

A step width of 100cm is generally more than sufficient. More is, of course, not wrong.

As for the type of stairs, I do not find half-turned stairs ideal to walk on. Almost all steps taper to a point on one side. I find landing stairs the most attractive. Half-turned stairs require just as much space as quarter-turned stairs. In most cases, they can be replaced IF the stairs on the upper floor do not meet a room wall with the short side. I hope you understand what I mean.

Now for a really silly staircase question: But is it possible to install a half-turned staircase from the ground floor to the upper floor, but a quarter-turned staircase from the ground floor to the basement? Or is that a structural problem?

What should be the structural problem about that? A staircase is usually neither load-bearing nor heavy. You just have to consider the following: The quarter-turned staircase mainly saves space in the basement (assuming both staircases are directly above each other). And with a steeper staircase, the basement becomes less usable (assuming this constellaton was meant by the question), on the one hand because you often carry bulky things there, and on the other hand because you don’t get any younger. Then you have to consider how much this space saving is "worth".

Why should that be a problem. The walls by the stairs are usually load-bearing, but not the stairs themselves. By the way, we reversed it in our current house. From the basement to the ground floor a half-turn staircase and from the ground floor to the upper floor a quarter-turn staircase. And of course, both staircases are directly above each other and require the same space :-)