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 x0 b% C8 Z! q3 ?) d: Q $ u2 O8 Q6 B$ J H; \This is just rough idea.