Normally, stairway $5.00 per step, floor $5.00 per sqaure yard. As the carpeter itself depening the quality you like. Also, for the floor footage, you need add roughly 10% extra as you need to cut and through some carpeter.. S' F- X$ j5 d( V; t4 z5 U
6 q# y& P0 R3 L" v* F% P$ M& D
This is just rough idea.