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. 5 X5 [- |/ D- c4 I1 D9 n" u, _ - C4 B7 s9 I! E M- mThis is just rough idea.