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 v7 A* N& ]; G2 c5 ]' H( f # g" |0 Y0 h- J s* w. ?This is just rough idea.