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. , t& c9 @# E+ d; T% C3 d " v. A( k2 j. E. v3 K7 \This is just rough idea.