Location of city villa or single-family house on 500 m2 plot - rectangular

No ... not at all. Irregular inclines on stairs cause accidents.

And, at the stair exit you don't have any extra space for another step either.

Ceiling height 275 cm?

I completely overlooked that. That's cute. But if you are satisfied with 2.50 m, the staircase will be shorter. For a small house, I find that okay. But be careful, in larger rooms it can quickly feel cramped.

Can you make the staircase "flatter" at the beginning and steeper at the end (after the bend)? Is that possible?

No.

Floor height 275 cm? That does not result in a clear room height of 250 cm, and Katja pointed out the rest.

Can you please calculate that for me?
The site manager said it like that.

Can you please calculate that for me? The site manager said it like that.

The floor structure is probably still missing. We don’t know it yet because we (still) don’t know your planning. 25 cm is usually the bare ceiling. What does the construction specification say about the thickness of the ceiling? Does it say anything about it at all?

No ... that’s not possible at all. Irregular risers on stairs cause accidents.

And, at the stair exit you don’t have any extra space for another step either.

Ok. You mean on the upper floor? Yes, the first room door comes up quickly there. You could make the "starting leg" longer, there is still a bit of space on the ground and upper floor.

But if you are happy with 2.50m, the staircase will be shorter. For a small house, I think that's fine. But be careful, in larger rooms it can quickly feel cramped.

Well, I currently have 2.70m clear room height in the condominium and so far I would have said less is not possible. But we were at a show house park before the Corona restrictions tightened where two houses actually only had 2.50m clear room height, one of them with a huge open plan room, and it didn’t look cramped at all. We were surprised as well. So, it probably works if the consequence for higher ceilings would be that more area goes into the staircase...

The floor construction is probably still missing. We don’t know that yet because we (still) don’t know your planning. 25cm is usually the bare ceiling. What does the construction specification say about the thickness of the ceiling? Does it say anything at all about it?

Actually, he told me the floor construction during the planning meeting. Of course, I didn’t write it down. Why ceiling? On the ground floor? Only plaster goes on that, right? I’ll have a look in the construction specification...

Why ceiling?

When you calculate the staircase, the floor height is sufficient. As long as the floor construction on the ground floor and the upper floor are the same, the distance also remains the same. The floor height is, to my knowledge (please correct me if I’m wrong), the height from the top edge of the floor slab to the top edge of the ceiling. With 2.75 m, you subtract the thickness of the ceiling plus the floor construction to find out the ceiling height on the ground floor. Depending on the size of the house, the thickness of the ceiling varies between 20 and 30 cm. If you assume 25 cm for the ceiling and 10 cm for the floor, you end up with a ceiling height of 2.40 m. That would be rather a bit tight.