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How to Replace a Door Knob

Swap out an old door knob for a new one, including interior and exterior styles

Beginner15-30 minutes$15–$807 steps2 min read
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What You'll Need

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Tools

Screwdriver

Phillips and flathead

Amazon

Tape measure(optional)

Amazon

Materials

New door knob set

Ensure it matches your door thickness (usually 1-3/8" or 1-3/4")

$15-$80

Amazon

Step-by-Step Instructions

1

Check compatibility

5 minutes

Before buying a new knob, measure your door thickness and the backset (distance from door edge to center of hole - usually 2-3/8" or 2-3/4"). Note if you have a single bore or double bore hole pattern.

Pro Tip

Take the old knob to the store to match the size and style, or take detailed measurements.

2

Remove the old knob

5-10 minutes

For most knobs: look for a small slot or detent on the neck of the interior knob. Press it with a flathead screwdriver and pull the knob off. Remove the decorative plate (rose) by prying or unscrewing. Remove the screws holding the mechanism.

Pro Tip

Some older knobs have visible screws on the interior plate. Newer ones hide the release mechanism.

3

Remove the latch

2 minutes

Unscrew the two screws holding the latch plate to the door edge. Pull the latch assembly out of the door.

4

Install the new latch

5 minutes

Insert the new latch into the edge of the door with the angled side facing the direction the door closes. Align the latch plate with the mortise (recessed area) and secure with screws.

Pro Tip

If the new latch plate is a different size, you may need to chisel the mortise slightly.

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5

Install the exterior knob

2 minutes

Insert the exterior knob assembly through the latch, aligning the stems or spindle with the latch mechanism. Hold in place while installing the interior side.

6

Install the interior knob

5 minutes

Position the interior mounting plate and align the screw holes. Insert screws and tighten evenly, alternating between screws. Don't overtighten. Attach the interior knob by pushing or screwing onto the mechanism.

7

Test the knob

2-3 minutes

Test the knob from both sides. Ensure it turns smoothly and the latch extends and retracts properly. Test the lock if applicable. Adjust screws if the knob feels loose or too tight.

Pro Tip

If the latch doesn't align with the strike plate, you may need to adjust the strike plate.

Common Mistakes to Avoid

  • Buying wrong backset size (knob won't align)
  • Overtightening screws (makes knob hard to turn)
  • Installing latch with angle facing wrong direction
  • Not checking door thickness compatibility

When to Call a Professional

For smart locks requiring electrical work, if the door needs new holes drilled, or for high-security deadbolt installations.

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Frequently Asked Questions

How difficult is it to replace a door knob?
This project is rated as beginner difficulty. Most homeowners with basic tools can complete this project. It typically takes 15-30 minutes to complete.
How much does it cost to replace a door knob?
The estimated cost for materials is $15–$80. This doesn't include tools you may need to purchase. Many of the tools required are common household items you may already own.
What tools do I need to replace a door knob?
You'll need: Screwdriver. Optional tools that can make the job easier include: Tape measure.
How long does it take to replace a door knob?
This project typically takes 15-30 minutes. The actual time depends on your experience level, the specific conditions of your home, and whether you encounter any complications. It's broken into 7 steps for easy tracking.
What are common mistakes when trying to replace a door knob?
The most common mistakes include: Buying wrong backset size (knob won't align). Overtightening screws (makes knob hard to turn). Installing latch with angle facing wrong direction. Following our step-by-step guide will help you avoid these issues.
Should I hire a professional to replace a door knob?
For smart locks requiring electrical work, if the door needs new holes drilled, or for high-security deadbolt installations.

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Project Overview

Difficulty
Beginner
Time
15-30 minutes
Est. Cost
$15–$80
Tools
2 items
Materials
1 items
Steps
7
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