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.7 \1 j! h Y2 t& N& X1 P% @* e8 u- `
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This is just rough idea.