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. $ b5 f0 w% W& e5 V p! y$ s# |: |6 y: k. N; P7 e
This is just rough idea.