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. . {! Y8 _; |0 {( D9 _# F 5 W' Z8 {: l0 PThis is just rough idea.