This is a massive collection of architectural tools that includes an "instant" staircase generator.
Although primarily a paid extension ($17/year), it is often searched for due to its professional-grade features. It allows you to create stairs from standard shapes, center lines, or 2D plan drawings almost instantly. instant stair plugin sketchup free download
Click Install Extension , select your downloaded .rbz file, and the tool will appear in your toolbar or the Extensions menu. Summary of Popular Stair Extensions Extension Warehouse Instant Stair - SketchUp Extension Warehouse This is a massive collection of architectural tools
Save the plugin file from a trusted source like SketchUcation or the Extension Warehouse. select your downloaded .rbz file
Available on the SketchUp Extension Warehouse or directly from Vali Architects . 2. MAJ Stair (Best Free Alternative)