Normally, stairway $5.00 per step, floor $5.00 per sqaure yard. As the carpeter itself depening the quality you like. Also, for the floor footage, you need add roughly 10% extra as you need to cut and through some carpeter.; P5 P$ u5 ?# u- J4 P+ p
^, p/ }5 `2 s2 p
This is just rough idea.