Question: how much does labor cost to install a door knob?
Answer: install a door knob national average cost The national average cost to install a door knob is $41.45 per knob, with a range between $32.24 to $50.66. The total price for labor and materials per knob is $122.72, coming in between $70.91 to $174.53. A typical 1 knob project costs $123.