How to Install a Patio Door Lock: Step-by-Step Guide

Published Date: Jul 25, 2025

Patio doors are beautiful and functional, but they’re often seen as weak points in home security. Adding or replacing a patio door lock with a key is a smart way to reinforce that entry point. In this article, we’ll learn how to install a patio door lock, from choosing the right lock to when to call a locksmith for professional installation.

Choosing the Right Patio Door Lock

Before you even think about how to install a patio door lock, it’s important to choose the right one for your specific door.

If you have a sliding patio door, look for locks that attach directly to the door’s surface or are installed into the door’s edge. For example, surface-mounted locks or mortise locks.

In contrast, swinging patio doors usually use deadbolts or keyed entry handles. Also, make sure the hardware is rated for exterior use so it can hold up against changing weather.

Popular Patio Door Lock Types

Surface-mounted locks are easy to install, simply screwing onto the inside surface of your door and frame. They usually include a keyed option (one that requires a physical key to unlock) for added security.
Mortise locks are usually installed inside the door panel. They’re often found in newer sliding patio door systems.
Foot bolts and security bars aren’t primary locks, but they are excellent for adding an extra layer of security. Foot bolts are installed at the bottom of the door and slide into the floor, while security bars brace the door against the frame.

If you want to limit access to only those you trust, consider using a patio door lock with a key.

How to Install a Patio Door Lock

Once you’ve picked the right lock, it’s time for the main part — getting it installed. Let’s walk through beginner-friendly steps to install a patio door lock.

Step 1. Gather Your Tools

Most basic lock installations need just a few household tools. Grab a screwdriver (Phillips or flat-head, depending on the screws), power drill, pencil or marker, tape measure, and level.

Step 2. Mark the Lock Placement

Open your patio door fully and decide where your new lock will go. This is typically on the frame or near the handle for sliding doors. Use a pencil to lightly mark screw holes or drill points. If you’re installing a patio door lock on the frame, close the door and hold the other part of the lock (the catch or bolt receiver) against the door to visualize exactly where they need to line up. Use your level to make sure your marks are straight.

Step 3. Drill Pilot Holes

If the lock requires screws, pre-drill small holes to prevent wood or vinyl from cracking. Use a drill bit that’s slightly smaller than the screws, and make sure the holes are straight.

Step 4. Attach the Lock

Line the patio door lock up with the pilot holes you just drilled. Use your screwdriver or power drill (on a low torque setting to avoid stripping screws) to secure it in place. If it’s a patio door lock with a key, install exterior parts, too. Make sure all lock parts are level and sit flush against the surface before fully tightening all the screws.

Step 5. Test Everything

Once installed, open and close the door multiple times to check that the lock catches and latches securely. If the door doesn’t lock smoothly, adjust the alignment of both the lock and the strike plate/catch and try again.

When a Mobile Locksmith Might Be the Smarter Choice

Sometimes, doing it yourself can be more challenging than expected. If your patio door is made of metal or glass, or you’re working with a mortise-style lock, installation can be tricky. In these cases, it’s often easier to let a professional handle the job. A mobile locksmith is especially helpful for more complex lock installations that involve keyed systems. You don’t need to face it on your own — an expert will come to your home, install the lock properly, and offer advice on how to fix a patio door lock if you want to handle future repairs yourself.

Summing Up

Securing your patio door doesn’t have to be a hassle. If you’re comfortable using tools and have the time, a bit of guidance is all you need to install a new patio door lock. Otherwise, Sure Lock & Key is just a call away to make the process easier. Call us today to schedule mobile locksmith services and enjoy a properly installed lock that keeps your home secure.

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