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. ; N* `# O4 t1 \1 H% S5 _3 J k ) _# F. \' G4 d/ v, TThis is just rough idea.