How to Install a Door Lock (Step by Step + Video Guides)

Did you know that 34% of break-ins happen through the front door?

In many cases, it’s not about brute force—it’s because of a poorly installed door lock or misaligned hardware that weakens security.

A lock isn’t just a piece of metal; it’s the first real barrier against unauthorized entry.

If it’s not installed correctly, it creates gaps that intruders can take advantage of. But when done right, it ensures a secure, seamless fit that protects your space.

This guide will show you how to install a door lock step by step, making sure you get it right the first time—no weak points, no security risks, just a properly fitted lock that does its job.

Let’s break down three critical steps to set the stage for a flawless installation:

Arm yourself with these essentials:

Not all locks fit all doors. Start by answering: What’s your door made of?

• Hollow metal doors: 

Opt for Grade 1 deadbolts with reinforced strike plates.

• Solid wood: 

Mortise locks offer durability but require deeper pockets.

• Smart locks: 

Verify door thickness (1¾” minimum) and Wi-Fi signal strength near entryways. 

Security needs vary. A hospital’s access control demands keypad logs, while a storage unit thrives on heavy-duty padlocks. Match the lock to the threat level.

A misaligned latch compromises security. Follow this sequence:

• Backset: Measure from the door edge to the lock’s center:

• 2-3/8" (common for residential applications)

• 2-3/4" (common for commercial applications)

• Latch position: If you’re wondering how to install a door lock latch, start by marking the door edge’s midpoint horizontally. Mark centerline 36"-48" from the floor.

• Face drilling: Use template stickers for perfect lock-body placement

Pro tip: Use a jig for drilling. This ensures holes stay straight in thick steel or aged timber.

Knowing how to install a door lock is essential for both security and convenience. But not all doors use the same locking system.

From keypad locks to sliding door locks with keys, different lock types require different installation methods.

Below, we break down how to install the six most common lock types with step-by-step instructions, ensuring a secure and functional fit for each type.

• Unscrew interior/exterior knobs.

• Extract the latch assembly from the door edge.

• Measure 36” from the floor for handle height.
• Use the lock’s template (depending on mortise lock or deadbolt) to mark hole centers on the door face and edge.

• Bore a 2-1/8” hole through the door face for the knob.

• Create a 1” cross-bore on the door edge for the latch.

• Chisel recesses for latch/faceplate flush with the door surface.

• Insert the latch, aligning the curved side toward the door frame.

• Secure exterior/interior knobs with mounting screws.

• Test the deadbolt 3-4 times for smooth retraction.

Pro tip: Apply graphite lubricant to the bolt if resistance occurs.

▶️ Video Guide: Pocket Door Lock Retrofit

• Measure 36” from the floor on the door edge.

• Trace the lock template (usually 1-3/4” x 3-1/8”).

• Drill pilot holes at each corner of the marked area.

• Use a jigsaw to cut out the notch, keeping the blade perpendicular.

• Insert the lock body into the notch.

• Align the latch with the strike plate on the wall frame.

• Secure with 1” wood screws.

▶️ Video guide: Pocket Door Lock Retrofit

• Unscrew interior/exterior thumb turns.

• Extract the old deadbolt from the door edge.

• Feed the keypad’s wiring through the door bore.

• Attach the exterior keypad using 3” screws.

• Align the interior adapter plate with the door holes.

• Insert AA batteries and pair the lock via Bluetooth/Wi-Fi.

• Use the manufacturer’s app to set master/user PINs.

• Test emergency keys to confirm mechanical override works.

▶️ Video guide: Keypad Lock Programming

• Confirm door thickness (1-3/8” to 1-3/4”).

• Verify hinge placement won’t interfere with sensors.

• Replace the existing deadbolt with the smart lock’s bolt.

• Connect the exterior keypad wires to the interior hub.

• Sync the smart door lock to your home Wi-Fi (e.g., August Wi-Fi Smart Lock).

• Enable voice commands via Alexa/Google Home.

Security tip: Pair fingerprint scanners with RFID cards for multi-factor authentication.

▶️ Video guide: Smart Lock Integration

• Align the lock body 42” above the floor on the sliding panel.

• Mark screw holes using the lock’s paper template.

• Use a 1/8” bit for metal/vinyl doors.

• Deburr holes with a metal file to prevent snagging.

• Attach the exterior cylinder with tamper-proof screws.

• Insert the deadbolt into the wall frame’s strike plate.

▶️ Video guide: Sliding Door Security Upgrade

• Remove the existing lock by detaching trim plates and disconnecting the wiring.

• Chisel a 40mm x 240mm recess in the door edge.

• Align the RFID sensor 48” from the floor.

• Initialize software (e.g., Onity HT Series).

• Program master keycards for staff.

• Assign room numbers and access tiers (maids vs. managers).

• Confirm emergency keys bypass electronic systems.

• Validate auto-locking triggers after 10 seconds.

▶️ Video guide: Hotel Lock Configuration

Here are some tips for successful installation of your door lock:

• Proper Alignment: 

A misaligned latch or strike plate is one of the biggest causes of sticking or improper locking. Before fully securing the lock, test the alignment by gently closing the door to ensure a snug but smooth fit.

• Reinforced Door Frame: 

For exterior and commercial doors, consider using reinforced strike plates and longer screws to prevent forced entry. This is particularly important for sliding door locks with keys or high-security hotel door locks, which benefit from a stronger mounting surface.

• Test Before Final Tightening:

After mounting the lock, test it multiple times to ensure smooth operation before fully tightening the screws. This small step can prevent unnecessary rework if adjustments are needed.

• Professional Installation:

Some locks—especially electronic or commercial-grade locks—require proper wiring, programming, or specialized tools. If you’re installing a smart lock, hotel lock, or door lock actuator, a professional locksmith can ensure everything functions correctly.

Installing door locks requires attention to detail and the right tools. 

Now that we've covered various steps on how to install a door lock for various lock types, from smart to traditional, remember that each door type presents its own challenges.

With practice, you'll become proficient in handling different lock installations, enhancing your skills and confidence in door hardware management. 

Choosing the right lock—whether a traditional cylinder lock or an advanced keyless entry system—ensures durability, reliability, and compliance for maximum security.

For professional-grade hardware, including door locksets, explore our in-stock inventory of 200k+ products.

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First, ensure proper measurements so the actuator reaches the bolt. Next, detach the indoor handle to access the door's edge. Then, use screws to mount the actuator's plate inside the door. Finally, connect the actuator arm to the latch bolt.

When putting in a new latch, first remove the old door lock assembly. Then position the latch in the door's crossbore, verifying 2 1⁄8 inches from the edge. Next, outline the faceplate screw holes and chisel recesses for the latch face and strike plate. Lastly, secure the latch with screws and test operation.

With some basic DIY skills and proper preparation, installing door locks does not need to be difficult. Following manufacturer instructions and watching tutorial videos can make the process more straightforward. Allow enough time and patience for adjustments to ensure proper alignment.

For an interior door, measure to find the centerpoint and mark at 36 inches high. Use a hole saw to drill an opening. Insert the lock assembly and trace the faceplate outline. Chisel a recess to fit and secure with screws. Adjust alignment as needed before testing the lock function.