Curved Staircase
Actually , the curved staircase or helical staircae is a little similiar to the spiral starircase . The main difference between the two styles of stairs is to do with the central column, spiral staircases have a central column whereas helical staircases can be more modified in their shape as they don’t need a central column. So the helical staircase is much more popular choice for those wanting a completely bespoke design.
Spiral staircase specification
Floating staircase catalog
Helical staircase catalog
Straight staircase catalog