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5. Reinforce any loose balusters by tapping in loose nails or adding new nails at their base. Use small nails to avoid splitting the wood, and tap them in lightly with a hammer. Tap the head in. 1. Grasp the top of the newel post at the bottom of the stairs. Shake it to see if it is loose. If it is, drill a hole into the outside of the post toward the stair framing beside it with a. Wooden Stairs Cost Hardwood stairs average $100 to $200 per step, including labor. A flight of stairs is 10 to 12 steps and would cost $1,000 to $2,400. Installation and materials can range as low as $1,000 and as high as $30,000. Price depends on several factors: Type of wood Number of steps Staircase design (L-shaped, floating stairs, etc.).