Garry Kernan has developed this exclusive sketchup plugin that can be used to generate circular and spiral stairs for residential and commercial projects. Stairs contain virtually any logical size. It is possible to change each stringer individually in respect of thickness, depth and style.
Stairs belong to open or closed risers. It is also possible to include supplimentary handrail profiles as per your choice.
This sketchup plugin supports Mac OS X, Windows, SU 7, SU 8, SU 2013, SU 2014, SU 2015, SU 2016. The plugin is available in various languages like English, French, Russian, Chinese(Traditional), Czechoslovakian etc.
Link for download sketchucation.com