Retro tread is a great way to remodel your staircase without having to purchase a whole new staircase. The Retro tread replaces the existing step entirely to give the effect of a new stair. It’s not only easier, it’s the most affordable option available.
Here is a link to give you a general idea. http://stairsolution.com/services/hardwood-staircase-a-flooring/retrotread.html