Normally, stairway $5.00 per step, floor $5.00 per sqaure yard. As the carpeter itself depening the quality you like. Also, for the floor footage, you need add roughly 10% extra as you need to cut and through some carpeter. / z' K, j; H+ ]; h% w- U6 G5 _ * R" w$ s. v+ h8 JThis is just rough idea.