Normally, stairway $5.00 per step, floor $5.00 per sqaure yard. As the carpeter itself depening the quality you like. Also, for the floor footage, you need add roughly 10% extra as you need to cut and through some carpeter. / O8 H$ S1 A- j( ^* F A 2 ]5 Q$ \! O6 G. FThis is just rough idea.