See below various solutions for professionals, in terms of stairs and window frames:
The challenge in designing a staircase is in the uniqueness of each project, as well as the staircase’s irregular use of space.
InterSCALA will carry out the initial study, the design and manufacture of a wooden staircase to the contractor’s specification.
What interSCALA needs to know is the diameter of the opening on the upper floor, the desired rise height and tread thickness.
Once this information is made available, interSCALA will package staircase and all information required for its installation.