Normally, stairway $5.00 per step, floor $5.00 per sqaure yard. As the carpeter itself depening the quality you like. Also, for the floor footage, you need add roughly 10% extra as you need to cut and through some carpeter. - ~3 m* Z4 Y* J7 z8 D6 j ( O0 v9 f7 n& cThis is just rough idea.