Garry K develops GKWare Stair Maker for sketchup. This sketchup extension is used to generate different types of curved, straight and spiral stair cases having a wide array of options. Stringers are housed (routed) or sawtooth (cut).
This sketchup extension supports SketchUp 7, SketchUp 8, SketchUp 2013, SketchUp 2014, SketchUp 2015, SketchUp 2016, SketchUp 2017.
The thickness and Depth of every Stringer can be easily modified. The users can keep full control over the thickness of treads, risers, landing thickness, nosing depth, bullnose radius etc.
A 2D to 3D stair tread convert utility also exists.
It is now possible to give label to your own stair style finished with your own saved parameters.
The users can avail a 7 days free trial version.
For more information visit, cabmaker32.com/stairmaker_manual/StairMaker.html
Link for download extensions.sketchup.com