How To Install a Door Lockset

Installing a new door lockset is an easy way to boost your home’s security. Whether you’re replacing an old lockset or installing one on a new door, the process is simple with the right tools and guidance. In the video above, This Old House general contractor Tom Silva demonstrates the process of installing a new lockset on a door.

Tools and Materials Needed To Install a Door Lockset

Before you begin, gather the following tools and materials:

• 1-inch hole saw bit
• 2 1/8-inch hole saw bit
• Chisel
• Door lockset kit
• Drill/driver
• Hammer
• Lubricant
• Pencil
• Screwdriver
• Tape measure

Preparing for Lockset Installation

Take the proper time to prepare before diving into the project.

Choosing the Right Lockset

First, choose the appropriate lockset for your door. Consider the following factors:

• Desired security level: Grade three is the lowest level and meets basic residential security needs, but you can opt for a higher-security lock if you prefer.
• Door thickness: You’ll need to ensure that the lockset is compatible with your door thickness and that the latch or deadbolt extends far enough into the door frame. Standard interior doors are usually 1 3/8-inch thick, while exterior doors are often 1 3/4-inch thick. Custom doors may have different thicknesses.
• Existing hole sizes (if replacing an old lockset): Choosing a lockset that matches the existing dimensions will make installation easier. Measure the cross-bore (large hole where the lock body sits), the latch bore (smaller hole on the door edge), and the distance from the door edge to the center of the cross-bore (backset).
• Style and finish: Though not important for function, choose a style and finish that complements your home’s decor.

Make sure the lockset you choose is compatible with your door’s specifications to avoid complications. Silva recommends verifying that all components are included in the package before starting the installation.

Preparing the Workspace

Prepare your workspace by clearing any obstacles or clutter away from the area around the door and laying down a drop cloth to catch sawdust and debris. Have all your tools within easy reach to avoid unnecessary delays during the installation.

Measuring and Marking

You’ll need to take accurate measurements to properly install your lock. Follow these steps:

1. Measure the thickness of your door to ensure compatibility with the lockset.
2. If replacing an old lockset, measure and transfer its height to the edge of the new door.
3. For a new installation, measure and mark the standard height for the lockset (typically 36 inches from the floor).
4. Use a door lock installation template or the template provided with your lockset kit to mark the precise locations for drilling.

Drilling the Holes for the Lockset

With your measurements and markings in place, you’re ready to drill the holes for your new lockset. This step requires precision to avoid damaging the door.

Boring the Face Hole

The face hole is where the doorknob or lever will be installed:

1. Attach a 2 1/8-inch hole saw bit to your drill.
2. Position the drill on your marked spot on the face of the door.
3. Drill halfway through from one side of the door.
4. Complete the hole by drilling from the other side to prevent splintering.

Silva demonstrates this technique of drilling from both sides for a clean result. This reduces the risk of damaging the door’s surface.

Creating the Edge Bore

The edge bore is for the latch mechanism:

1. Switch to a one-inch hole saw bit on your drill.
2. Align the drill with your marking on the door’s edge.
3. Carefully drill the hole for the latch.

Take your time to make sure the hole is straight and properly aligned with the face hole. Misalignment can cause difficulties when installing the latch.

Ensuring Proper Alignment

After drilling the holes, check for proper alignment by inserting the latch and lock components. You can correct misalignments with slight adjustments to the drilled holes. 

Installing the Door Latch

With the holes drilled, you’re ready to install the latch mechanism. 

Preparing the Latch Plate Area

Before inserting the latch, you need to create a recess for the latch plate:

1. Position the latch in the edge bore and trace its outline on the door edge.
2. Use a chisel to carefully cut a shallow mortise for the latch plate.
3. Test fit the latch to ensure it sits flush with the door edge.

In the video, Silva shows how to achieve a precise fit for the latch plate, ensuring smooth operation.

Securing the Latch

Once the mortise is prepared, you can install the latch:

1. Insert the latch into the edge bore.
2. Ensure the latch face is oriented correctly for the door’s swing direction.
3. Secure the latch plate with the provided screws.

Double-check that the latch moves freely and aligns properly with the face hole before proceeding. 

Mounting the Lockset

Now you’re ready to install the main components of the lockset. This step brings all the elements together for a fully functional door lock.

Assembling the Lockset

Most locksets come in two halves that need to be assembled on the door:

1. Insert the exterior portion of the lockset through the face hole, ensuring the spindle engages with the latch.
2. From the interior side, slide the other half of the lockset onto the spindle.
3. Align the screw holes and secure the two halves together using the provided screws.

Be cautious not to overtighten the screws, as this can affect the lockset’s operation. 

Testing the Mechanism

Always test the lockset after installation:

• Turn the knob or lever to check for smooth operation.
• Test the locking mechanism to confirm it engages and disengages properly.
• Open and close the door several times to check for any binding or misalignment.

Finishing Touches on Lockset Installation

To complete your lockset installation, consider these final steps:

• Install the strike plate on the door frame, aligning it with the latch.
• Apply a small amount of lubricant to the latch and lock mechanism for smooth operation.
• Clean up any debris or markings left from the installation process.

Tips for Lock Maintenance

Regular maintenance can help your lock last longer. Here are our tips:

• Regularly check the alignment of the lockset components.
• Keep the lock mechanism clean and free of debris.
• Apply lubricant periodically for smooth operation.

Our Conclusion

Installing a lockset is a manageable do-it-yourself (DIY) project if you have patience and the proper tools. When you’ve finished one door, we recommend adding matching locks to others for improved security and a cohesive look. Remember to take your time, follow the manufacturer’s instructions, and don’t hesitate to seek professional help if you encounter any difficulties.