When it is not possible to install the elevator in the exterior of the building, due to technical issues, it is possible to recur to constructive solutions consisting on modifying the staircase totally or partially, which allows installing the elevator supporting structure and the new staircase sections.
• External stairs using the former flight of stairs to install the new elevator.
• Straight staircases.
• Curved staircases.
In all cases, the closings can have different finishes: glass, brick, sandwich panel and more.