How To Bore for a New Door Knob

Whether you’re replacing an old, worn-out knob or upgrading to a more modern style, installing a new door knob involves boring holes in your door. While this task may seem daunting, with the right tools and guidance, it’s a project that most homeowners can tackle.

In this article and the video above, This Old House expert Tom Silva shows us the step-by-step process of boring for a new door knob, providing valuable insights along the way.

*Cost information in this article sourced from estimates used by Angi.

Door Knob Basics

Before you start boring for a new door knob, you need to familiarize yourself with the types of door knob sets and the measurements involved.

Types of Door Knob Sets

Door knob sets come in various styles and serve various purposes. You’ll need to choose the right one for your needs.

Here are the most common types of knob sets:

• Dummy sets are non-turning knobs that often show up on closet and pantry doors.
• Entry sets are standard on exterior doors and feature a keyed lock for security.
• Passage sets are standard on interior doors. They feature knobs on both sides of the door and typically lack a locking mechanism.
• Privacy sets are standard for bedrooms and bathrooms and feature a locking mechanism on one side.

Important Measurements

When selecting a new door knob, refer to the measurements listed below to help you choose one that fits your door correctly and will be easy to operate.

• Backset: This is the distance from the edge of the door to the center of the knob bore. Common backsets are 2 3/8 inches or 2 3/4 inches.
• Bore diameter: The standard size for the main knob hole is 2 1/8 inches.
• Latch bore: The hole on the edge of the door for the latch mechanism is typically 1 inch in diameter.
• Door thickness:  The chosen knob set needs to be compatible with your door’s thickness, usually 1 3/8 inches or 1 3/4 inches for residential doors.

Preparing To Bore a New Door Knob

There are a few steps you need to complete before you can start boring for a new door knob. We’ve provided a list of tools and materials you’ll need, as well as advice for safety, cleaning, and measurements below.

Tools and Materials Needed

Before you get started, gather these tools and materials:

• Chisel
• Door knob installation jig
• Drill/driver
• Dust mask
• Hole saw bits (2 1/8-inch and 1-inch)
• Pencil
• Safety glasses
• Screwdriver
• Tape measure
• Vacuum cleaner

Safety Considerations

Safety is paramount when working with tools. Here are some safety tips to keep in mind to prevent injuries:

• Maintain a clean workspace: Keep your workspace clean to avoid accidents.
• Use tools properly: Follow the manufacturer’s instructions for all tools and equipment.
• Wear safety gear: Always wear safety glasses and a dust mask to protect your eyes and lungs from debris.

Clean and Take Measurements

Before you can start boring for a new door knob, you’ll need to clean up the area and take measurements. Here’s how:

1. Clean the door surface and edge where you plan to install the new knob.
2. Measure and mark the desired height for your new knob, typically 36 inches from the floor.
3. Determine the backset measurement you’ll be using (2 3/8 inches or 2 3/4 inches).

How To Bore a New Door Knob

With your measurements and tools in hand, it’s time to start the process. Silva demonstrates how to bore a new door knob in the video and emphasizes the importance of precision and safety.

Let’s walk through the process step by step.

1. Set the Door Knob Installation Jig

A door knob installation jig is a valuable tool that improves accuracy. Take these steps:

1. Set the jig to your desired backset measurement.
2. Position the jig on the door at the marked height.
3. Secure the jig in place according to the manufacturer’s instructions.

2. Bore the Main Hole

Once you’ve set the jig, follow these steps to bore the main hole:

1. Attach the 2 1/8-inch hole saw to your drill.
2. Align the drill with the jig’s guide hole.
3. Keep the drill level and perpendicular to the door surface.
4. Apply steady pressure and let the drill do the work—don’t force it.
5. Once the pilot bit breaks through, stop and complete the hole from the other side to prevent splintering.

3. Bore the Latch Hole

For the latch hole, follow these steps:

1. Switch to the 1-inch hole saw.
2. Use the jig to guide the drill bit on the door’s edge.
3. Bore the hole, maintaining a level position.

Installing Your New Door Knob

Once the hole is bored into your door, you can begin installing your knob set. 

1. Install the Latch Plate

Here’s how to attach the latch plate:

1. Position the latch plate on the door edge, centering it over the 1-inch hole.
2. Trace the outline of the plate with a pencil.
3. Use a chisel to carefully remove wood within the outline, creating a recess for the plate.
4. Test-fit the plate and make adjustments as needed.
5. Secure the latch plate with the provided screws.

2. Mount the Door Knob

Now it’s time to install the actual door knob. Take these steps:

1. Insert the latch mechanism into the edge bore, making sure it’s oriented correctly.
2. Place the exterior knob assembly through the main bore, aligning it with the latch.
3. Install the interior knob assembly, lining up the screw holes.
4. Secure the knob set with the provided screws, being careful not to overtighten.

3. Install the Strike Plate

The final step is to install the strike plate on the door frame. This piece will create a secure latch action when you close the door.

Here’s how:

1. Close the door and mark where the latch hits the frame.
2. Position the strike plate and trace its outline.
3. Chisel out a recess for the plate if necessary.
4. Secure the strike plate with screws.

Door Knob Maintenance Tips

Maintenance can help keep your new door knob in good condition. Keep these tips in mind: 

• Check screws: Periodically check the screws to make sure they haven’t loosened over time.
• Lubricate: Periodically apply a small amount of lubricant to the latch mechanism to keep parts working smoothly.
• Regular cleaning: Clean the knobs with a soft cloth and mild detergent to keep them looking new.

Troubleshooting Common Issues

These are common problems you might see when boring for a new door knob and installing the hardware:

• Loose knob: If the knob is loose, tighten the screws and make sure all components are correctly aligned.
• Misaligned holes: If the holes don’t align properly, re-measure and re-drill. 
• Sticking latch: If the latch sticks, check for any obstructions or misalignment and adjust accordingly.

Our Conclusion

Boring for a new door knob and installing the hardware are easy DIY projects. With the right tools and careful attention to detail, you can successfully install a new door knob in about an hour. Remember to prioritize accuracy in your measurements and hole placement for the best results. 

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