Settlement on wooden staircase. Can it be fixed?

[chokonanana]

We recently bought a split-level townhouse. One staircase to the upper floor and one staircase to the basement level. Both staircases are slanted, the upper one I think is slanted quite a lot. Can anything be done about it?

Is it possible for a carpenter to fix it, or do we need to replace the entire staircase?

 

[richardtenggren]

Have you tried turning the spirit level 180° to confirm it's showing correctly? It doesn't seem to exude quality directly.
If it leans that much, it should almost be visible to the naked eye.

 

[chokonanana]

It is visible to the naked eye and is clearly felt when walking up the stairs. We noticed it already during the viewing.

It's the outer part that has sunk down. Strangely enough, all the way around. But especially at the first 90-degree turn on the way up.

 

[Amalieberg]

It is visible to the naked eye and it feels noticeable when walking up the stairs. We noticed it already at the showing...

It is the outer part that has sunk down. Strangely enough, all the way around. But especially at the first 90-degree turn on the way up.

Did you come up with any solution for this? We are in the same situation now, moving into the house this fall and noticed at the showing that the stairs are slanting.

 

[chokonanana]

I found out which manufacturer made the staircase and called them to ask. They said you need to install two screws per stair stringer. It turned out that we didn't have any at all. Uncertain where the mistake occurred, but it likely was installed incorrectly from the beginning. We had two staircases in the same stairwell, so we temporarily reinforced the lower staircase with beams between the floor and stringer. Once we knew the lower staircase was secured, we placed a beam on the lower staircase's stringer along with a jack to lift the upper staircase's stringer. We raised one corner 3cm and the other 4cm. When they were in position, we screwed the stringer to the wall. It turned out well. Not 100% straight but 80-90% We are satisfied with the result. It took a few hours. A carpenter would probably do it in 2-3 hours.

 

[Amalieberg]

I found out which manufacturer it was on the staircase and called them and asked. They said you need to mount two screws per stringer. It turned out we didn't have any at all. Unsure where it failed but most likely they've installed it wrong from the start. We had two staircases in the same stairwell, so we temporarily reinforced the lower staircase with studs between the floor and the stringer. Once we knew the lower staircase was secured, we put a stud on the lower staircase's stringer along with a jack to lift the upper staircase's stringer. We raised one corner by 3cm and the other by 4cm. When they were in place, we screwed the stringer into the wall. It turned out well. Not 100% straight but 80-90% We are happy with the result. It took a few hours. A carpenter would surely do it in 2-3 hours.

Thanks for your response!
Manufacturer is hard to reach - the house is built '34 and the staircase probably isn't newer than that as it is embedded in the house. Thanks for the tip. I'll see what I can achieve upon moving in!