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. 6 V* X' m" `# ?& e( N 7 |& I: D! `' `1 w* DThis is just rough idea.