Hello all knowledgeable people!

I am going to open up the house with a new staircase where there is none today.
The staircase requires an L-shaped hole or to angle a beam and create a straight opening.
I am attaching measurements of the current joists (marked in black) and the hole that needs to be cut out.
I wonder if someone with experience can see how a relief for the existing joists could be done most easily?

I am also attaching measurements of the staircase if anyone feels inclined to dive a little deeper :)

All help is appreciated with your ideas.

Thanks in advance!

All the best//Anton
 
  • Diagram showing measurements for a staircase opening, with black lines indicating current beams and red lines outlining a new L-shaped opening.
  • Blueprint of a spiral staircase with measurements and structural details for cutting an opening; shows current support beams and proposed cuts in black.
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