ᐅ Steel Stringer Staircase | Possible Design Flaw? Your Opinions

Hello dear forum members,

We are currently building in a new residential area in northern Germany.
We have a question about our steel stringer staircase and would appreciate your collective expertise:
We commissioned a well-established company to build a steel stringer staircase, quarter-turn, with a rise of about 19.3 cm (7.6 inches) and a tread depth of 25 cm (10 inches) per step.
This would result in 15 steps from the ground floor to the upper floor.
Now the company has installed the staircase.
Disaster: The last step at the upper floor ends exactly at the finished floor level and is only 15 cm (6 inches) wide. This is probably due to the width of the steps in the quarter-turn section.

We did not expect this at all—in other words, our already installed stair lighting (electrical work) does not fit, and we do not like the idea of ending on a half step at the upper floor.

The company was unable to provide a construction drawing in advance, saying they were “too busy.” In hindsight, maybe we should have been more cautious and stopped the process at that point?

Could you please give a brief assessment of this staircase? Do we have to accept it as is, or should we take action?
We are honestly quite shocked in a negative way...

Many thanks for your opinions and best regards
Tita

Hmm, nothing can be seen here. Maybe you could add one or two more photos... an overall view and a perspective from the upper floor.

Where and how are the steps supposed to be installed?

Yes, it’s not entirely clear what this is about.
Is it that the top step is simply shorter than the others? That wouldn’t be unusual. The reason is that during the actual measurement, the result often differs from the original plan, and you don’t usually recalculate the rise ratio. Often, the top step is therefore already planned to be shorter.

So why is that a disaster now?

We also have a narrow step on the upper floor. It’s completely fine, even though it might have been possible to perfect it. It works well and isn’t really noticeable.

Is the exit step meant, the one that is flush with the floor at the top?

The tread width of a staircase is not the same as the step width. In my old carpentry textbook, the tread is half as wide as a regular step. It is well done if the height aligns exactly with the later floor covering.

Best regards
Gabriele