How To Replace a Door Knob With a Lock: Step-by-Step Guide
Published Date: Nov 26, 2025
Thinking about updating your interior or entry doors? DIY is easier than you might think — and it’s a smart way to boost both security and convenience. Whether it’s for a bedroom, office, or front door, this quick guide will help you tackle your home lock replacement with confidence. You’ll learn exactly how to replace a door knob with a lock, broken down into 5 clear steps — from door knob removal to installation. And if DIY isn’t your thing, no worries — Sure Lock & Key is always available with professional residential locksmith services.
Step 1: Gather the Tools You’ll Need
To make the process smooth, gather a few basic items:
- Phillips screwdriver
- Flathead screwdriver (for hidden screws)
- Measuring tape
- A new door knob with a lock and key
- Optional: chisel or utility knife (for fitting adjustments)
Starting with the right tools makes any home lock replacement job easier and faster.
Step 2: Remove the Old Door Knob and Hardware
Removing the existing parts is your first real step toward a secure upgrade.
Remove the screws:
Most knobs have screws on the interior side. If you don’t see them, gently pop off the cover plate to reveal them underneath.Pull off the knobs:
Once the screws are out, grip both sides and pull them apart. A little wiggling helps if they’re tight.Remove the latch:
Unscrew the latch from the edge of the door and pull it out. This is a basic part of any door knob removal process.Take off the strike plate:
Unscrew and remove the metal plate from the door frame. This helps your new door lock installation align correctly.
Need help with this part? Check our detailed guide on door knob removal.
Step 3: Prepare for New Door Lock Installation
Now the door is empty — let’s get it ready for your new lock.
Clean out the hole:
Remove any dust, paint, or leftover debris. Clean edges help the new hardware sit securely.Measure the backset:
Measure from the door’s edge to the center of the borehole. Most modern latches allow you to adjust the door latch backset easily.Test-fit the hardware:
Place the latch and knob in the door to check alignment. It should feel snug, not forced.
Step 4: Install the New Locking Door Knob
Now it’s time to install the upgraded residential door hardware.
Insert the latch:
Slide the new latch into the side of the door, making sure the curved side faces the direction the door closes. Screw it in.Attach both knobs:
Align the inside and outside knobs through the holes. The lock should be on the interior side, especially for a bedroom door knob with a lock.Tighten the screws:
Secure the knobs with the included screws. Once installed, the knob should turn and lock smoothly.
For more details, follow our tutorial on how to install a door knob with a lock with step-by-step instructions.
Step 5: Install the Strike Plate and Test the Lock
Now for the final touches — this part ensures everything works correctly.
Attach the strike plate:
Screw the new strike plate onto the door frame, aligning it with the latch for smooth locking.Test the lock:
Open and close the door several times. Lock and unlock it to make sure it feels right. This step confirms your door knob replacement instructions worked properly.
Looking to Upgrade? Here Are Smart Lock Options
If you’re planning more than a simple swap, there are great ways to take your door security and privacy to the next level. These upgrades are often part of a larger home lock replacement project and can be tailored to fit your lifestyle and space.
Here are a few ideas to consider:
- Door knob with lock for bedroom – A simple, secure option to add privacy to personal spaces like bedrooms or home offices.
- Deadbolt and door knob combo – Ideal for exterior doors to improve overall security.
- Smart door lock – Use a code, app, or keyless entry to access your home — no physical key required.
- Full residential lock change – Best when you’re updating multiple doors at once or moving into a new home.
- High-quality residential door hardware – Upgrade your look and durability with premium locks, handles, and strike plates.
Need help choosing the right option? Sure Lock & Key can walk you through the best fit for your home and professionally install whatever you choose.
Need more information?
Get a free quote
Professional Lock Replacement Made Simple with Sure Lock & Key
Even with clear door knob replacement instructions, you may hit snags like stripped screws or misaligned parts. Whether you’re doing a simple swap or a full new door lock installation, Sure Lock & Key residential locksmiths have the tools and experience to make it easy.
From small updates to full-scale door hardware replacements, our trained team is ready when you are. Give us a call today to schedule service or ask questions — we’re always glad to help.
Frequently Asked Questions
How to replace a door knob?
Start by removing the screws, latch, and strike plate. Then install the new knob, making sure everything aligns with the existing holes.
How to replace a bedroom door knob with a lock?
Choose a privacy-style knob with an interior lock. The process is nearly the same — just be sure the lock side faces the inside of the room.
How to replace a mortise lock with a modern door knob?
You’ll need to remove the entire mortise assembly. Depending on the size and shape of the hole, you may also need a conversion plate to fit a standard knob securely.
Can you replace a door knob with a deadbolt?
Not directly. A deadbolt requires a separate hole above the knob, but both can be installed on the same door for better security. If you’re not sure how to drill for a deadbolt, a professional like Sure Lock & Key can help.
What’s the difference between replacing a door knob and a door handle with a lock?
The process is very similar, but handles often come with a different internal mechanism and may require a slightly different installation approach. If you’re specifically replacing a lever-style handle, check out our full guide on how to replace a door handle with a lock for step-by-step instructions.
How to remove a door lock that is stuck?
Try using a lubricant and gently tapping around the lock with a rubber mallet. If it still won’t budge, it’s best to call a locksmith. Sure Lock & Key can safely remove stuck locks without damaging the door.