Winder stairs fully enclosed

[Dunc]

I need help understanding how a winder staircase can be installed in a fully-enclosed stairwell, please.

CAD drawing shows the as-measured openings between stud/structural walls. Architects plans for context also attached.

Stairbox have suggestd an over-stringer width of 1000mm which in principle fits with 20mm tolerance. However, the newel post at the inside corner of the winder overhangs the stringer by 29mm which means it doesn't fit between the walls. They suggested trimming back the studs on the inner corner to set the newel post into the wall. But I can't see how the stair would be constructed and inserted into the available opening as the newel post would have to pass all of the other studs first if the upper run is installed from the first floor with the post attached (which I belive is how it's usually done?).

 

[Mr Punter]

Are you fitting this yourself?  You may need to have some components supplied loose.  If the wall is already there you will need a fair amount of wood butchery.  The winders look odd.  I think there should be minimum 50mm going on the short ends, so #6 would not work.

[Oz07]

With much difficulty, d4 glue getting everywhere and swearing. Does the stud come right up into the first floor too? 1m is quite a wide staircase. Maybe you should be looking to have it made at 850, 900mm?

[Mr Punter]

I often see architects show stairs that do not work as a standard timber staircase.  Your architect drawing did not show any newels or handrails.

[Dunc]

Yes was hoping to install the stairs myself....

Yes, stud walls are full height and already in place because they are structural racking. Only the stub wall is not structural. I suspect that one at least will have to come out.

I'm reassured that I haven't missed something obvious!