Normally, stairway $5.00 per step, floor $5.00 per sqaure yard. As the carpeter itself depening the quality you like. Also, for the floor footage, you need add roughly 10% extra as you need to cut and through some carpeter. ! R& J- |, I. }4 T: | % z$ Y: j: k0 {' e) M0 d4 W* wThis is just rough idea.