I was planning to build a new entrance from inside to the basement by making a staircase down to the basement together/underneath the interior stairs to the upper floor. In theory, everything was quite simple; calculation of U-stairs, stringers, etc., but when it came to practice, it became clear that a foundation wall of 500 mm and an outer wall of 200 mm (max) mean that the center axis of the inner stairs does not align with the center of the basement stairs.
My question is: How do I unload/resolve the center for the stairs to the upper floor versus the stairs to the lower floor?
