How to Replace a Door Knob and Lock: Step-by-Step Guide
Published Date: Jul 28, 2025
Does your door knob feel loose, outdated, or just not as safe as it used to be? Many homeowners wonder how to replace a door knob with a lock and are surprised to find it’s easier than expected. This step-by-step guide shows you exactly how to change a door knob and lock, even if you’ve never done it before. With just a few basic tools, you’ll have your new hardware in place in no time.
Getting Ready: What You’ll Need and How to Check Your Setup
Before diving into the job, make sure you have the right tools. Here’s what to grab:
- Phillips head screwdriver
- Measuring tape
- Utility knife (only if the old knob is sealed with paint or caulk)
Take a quick look at your current knob. Are the screws visible? Is the lock part of the knob or a separate piece? These details help you know exactly how to take it apart and what to expect during installation.
A quick note on sizing: check your door’s backset (the distance from the door edge to the center of the knob hole). Most homes in the U.S. use either 2 ⅜" or 2 ¾". Your new latch should match this for a smooth fit.
DIY Made Easy: How to Change Doorknob with a Lock
Replacing door hardware might seem tricky at first, but with the right guidance, it’s actually very doable. Here’s a straightforward breakdown of how to change a door knob lock with ease — no hassle, no confusion:
Remove the Old Hardware: Start by unscrewing the two screws on the interior side of the knob. If you're unsure where to begin, this guide on how to remove a door knob with a lock can walk you through it. Once the screws are out, pull both knobs off. They should come off easily, but if there’s paint buildup or they feel stuck, a little wiggling usually helps.
Take Out the Latch Mechanism: Look at the door edge and remove the screws from the latch plate. Slide the latch out. Note its orientation so you can install the new one the same way.
Install the New Latch: Slide the new latch into place, making sure the beveled side faces the direction the door closes. Secure it with the screws provided—tighten them enough to hold it in place, but don’t overtighten.
Attach the New Knobs: Insert the exterior knob first, lining up the spindle with the latch. Then align the interior knob and fasten both sides using your screwdriver. The knobs should sit securely with no wobble.
Test Your Work: Turn the knob, lock and unlock it, and open and close the door a few times. Everything should feel smooth. If the latch doesn’t catch properly, loosen the screws slightly, adjust the position, and try again.
Don’t Let These Small Mistakes Ruin the Job
Even if this seems straightforward, a few things can trip people up:
- Use the right backset: Measure it before buying a new lock so it fits correctly.
- Avoid overtightening screws: Too much pressure can strip the holes or throw off alignment.
- Double-check latch direction: The beveled side should face the direction the door closes.
Avoiding these issues can save you time and keep your new knob working as it should.
Wrapping Up
Now that you know how to replace a door knob and lock, you’ve seen it’s a small project that can be both satisfying and cost-effective if you choose the DIY route.
Still, if you’d rather leave it to a professional — or things aren’t going quite as planned — Sure Lock & Key can take it from here. Our licensed home locksmith team handles all types of residential lock installations and repairs with speed, skill, and lasting results. Contact us today for reliable service that puts your security first.