Question: how much does it cost to install window sill?
Answer: Install a Window Sill national average cost The national average cost to install a window sill is $1.86 per sill, with a range between $1.49 to $2.24. The total price for labor and materials per sill is $74.25, coming in between $57.80 to $90.70. A typical 6 sill project costs $446.