ᐅ "Overlap" of one floor with the staircase

ArminGT schrieb:

My question is, how large can this overlap be? For the staircase, I am assuming a length of 4.0 meters (13 feet).
A drawing for better understanding is attached.

This cannot be answered in general, as it depends on the floor construction, story height, and the staircase angle.
Just plan without any overlap. As a layperson, you won’t be able to plan precisely down to a few centimeters (inches) anyway.
If the designer creates the final plans, you might be pleasantly surprised by a little extra space. For transporting furniture perfectly, I actually recommend not building anything beforehand.

google: Stairs 101

Please draw the staircase in a side view using a reduced scale. Keep in mind that a person swings their body forward when walking. There should be at least 2 meters (6 feet 7 inches) of clear headroom here.

ArminGT schrieb:

I’m just assuming a "standard" story height of around 2.6 m (8.5 ft)

That is not a standard—at best, maybe in Baden-Württemberg. The standard ceiling height is rather about 260 cm (102 inches), so the floor-to-floor height is approximately 285 cm (112 inches).

ArminGT schrieb:

What do you mean by "chicken ladder"?

285 cm (112 inches) divided by 16 risers equals a step height of 17.81 cm (7 inches); with a tread depth of 27.38 cm (10.8 inches), the total staircase length is 4.38 m (14.4 ft). With 15 risers at a 19/26 ratio, it would only be 3.90 m (12.8 ft), which is comfortable only up to about forty years of age. With your 4 m (13.1 ft) staircase length, retirement won’t be eagerly awaited—you’d rather be singing “If I were seventeen again...”

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Maybe this will help you understand the problem better:

Here, the overlap is about 50cm (20 inches). And that can already feel uncomfortable if you are 180cm (71 inches) tall or taller.

If you come down the stairs with some momentum, it can even become a problem for shorter individuals.