How much does it cost to install a door knob?

The cost to install a door knob typically ranges from $50 to $150, depending on factors such as the type of knob, labor costs, and whether any additional hardware or modifications are needed. If you hire a professional, labor costs can add an additional $20 to $50. DIY installation can reduce costs significantly, requiring only the price of the door knob and basic tools. Overall, the total cost will vary based on your specific situation.