Normally, stairway $5.00 per step, floor $5.00 per sqaure yard. As the carpeter itself depening the quality you like. Also, for the floor footage, you need add roughly 10% extra as you need to cut and through some carpeter. 3 R$ N" e( w# O2 j- y+ x& S ; t& S: a, p4 y7 O% z4 x4 fThis is just rough idea.