how much for a wooden staircase
1 Installing hardwood stairs costs approximately $100 to $200 per step, including labor and materials. 2  Assuming that the stair case has 17-20 stairs, thatâs a total estimated cost of $1,700 to $4,000. Assuming that the stair case has 17-20 stairs, thatâs a total estimated cost of $1,700 to $4,000. 2  Depending on the contractor, staining and finishing (with a urethane product) the newly-installed stairs might be included with the job. 3  If not, it will cost extra (of course, you can stain/finish the stairs yourself).