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How to Secure Your Garage Door and Opener

By Guardian Angel DIY · Updated October 27, 2026 · 9 min read

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The garage door is the largest opening in most homes, and it is often the least protected. People who lock every window still leave the garage open while they work in the yard, keep the remote clipped to a visor, and never think about the emergency release cord. A few small habits and a handful of inexpensive fixes close most of the gaps. This guide shows how to secure a garage door and its opener, in the order we recommend doing it.

Why the garage deserves attention

An attached garage is effectively a second front door. It is large, it hides activity from the street, and it usually holds tools, ladders and sometimes a car. If someone gets into the garage, the interior door is often the only thing between them and your living space, and that door is frequently weaker than the front door. A detached garage may hold valuable tools and bikes, and it has no one inside to hear a break-in.

The usual ways into a garage are simple and mostly preventable:

• The door was left open or unlocked.
• A remote or a code was taken or guessed.
• The release cord was reached from outside.
• A side door, window or the main door was forced.

Check your garage first (15 minutes)

1. The habit test. For a week, count how often the garage door stays open when nobody is outside. Be honest.
2. The remote test. Where do the remotes live? In cars, on visors and in unlocked vehicles are all risks. Count how many exist and who has them.
3. The gap test. Stand outside the closed door at night with a flashlight inside. Look for gaps at the top and sides. Can you see the release cord or the opener?
4. The cord test. Find the red emergency release cord. How far down does it hang, and could it be reached through a gap near the top?
5. The side door test. If there is a side or service door, check its lock and its frame as you would an exterior door.
6. The view test. Do windows in the door or walls show tools, bikes or what is stored inside?

Fix 1: Build the closing habit (free)

This is the most effective fix, and it costs nothing. Make a rule that the door is closed whenever you leave the garage, at night, and when you leave the house. Use a reminder if you need one, such as a note by the door to the house. If you forget often, a smart control (see Fix 6) will alert you and let you close it from your phone.

Fix 2: Protect the remotes and the keypad code (free to a few dollars)

• Do not leave a remote in an unlocked car. Anyone who gets into the car can find the remote, and a registration or mail in the glove box shows where it opens. Take the remote with you, or use a keychain remote.
• Pick a code that is not obvious. Avoid your address, birthday or "1234." Change the code when you move in, when a contractor has had it, or when a household member leaves.
• Keep track of remotes. If one goes missing, reprogram the opener to erase old remotes.
• Check the opener type. Older openers use a fixed code, which can be copied. Newer ones use a rolling code, which changes each time and is much safer. If your opener is very old, replacing it is a real security upgrade.

Fix 3: Secure the emergency release cord (free to $10)

Every automatic garage door has an emergency release, usually a red cord with a handle, so you can open the door by hand if the power fails. On some doors, the cord hangs close enough to the top of the door that someone could reach a hooked tool through the gap and pull it, which disengages the opener. You can reduce this in a few ways:

• Shorten the cord so the handle hangs just within your reach and not near the top.
• Close the gap. Weatherstripping at the top and sides of the door narrows gaps that a tool can pass through, and it keeps out drafts.
• Add a shield. Some hardware stores sell small covers that keep the cord out of reach from outside.

Do not do anything that stops you from using the release in an emergency. It exists so that you can open the door in a power outage or if a person or pet is trapped, so it must stay easy to reach and use from inside.

Fix 4: Lock the door when you are away ($5 to $20)

Many garage doors have a simple manual lock, such as a slide bolt, that locks the door to the track. It is a solid backup for trips, and it makes the door much harder to lift from outside. If you use one, unplug the opener first, so that a remote or a keypad press does not drive the door against the lock and damage it. When you return, unlock it before you plug the opener back in.

Fix 5: Secure the other entry points (varies)

• Side or service door. Treat it as an exterior door: solid or steel, a Grade 1 deadbolt, a solid frame and long screws. Our guide to choosing a deadbolt and our guide to reinforcing a front door apply.
• The door into the house. This one matters so much that we gave it its own guide: how to secure the door between your garage and house.
• Windows in the door or walls. Frost them, cover them with film or hang a curtain, so no one can see what you store or whether a car is inside.
• Lighting. A bright motion light over the garage door puts anyone working at it on display. See motion vs. dusk-to-dawn lighting.
• Tools and ladders. Lock up or hide anything that can be used to break in, such as a ladder, a crowbar or a heavy hammer.

Fix 6: Add a smart garage control ($30 to $40)

A smart garage control is a small device that connects to your existing opener and your Wi-Fi. It tells you whether the door is open or closed, lets you close it from your phone, and can send an alert if the door stays open longer than expected. That solves the biggest garage problem, which is forgetting. It also lets you give a trusted person access without handing out a keypad code.

It is a convenience layer, not a replacement for closing the door. It needs a stable Wi-Fi signal in the garage and an app account, and a service outage can interrupt remote control. Make sure your account has a unique password and two-step sign-in, since this account controls an opening to your home.

Before you travel

1. Close and check the garage door, and confirm that it stays closed.
2. Use the manual lock, and unplug the opener.
3. Remove remotes from cars and take any spare with you.
4. Lock the door into the house, and the side door.
5. Ask a neighbor to park in the driveway now and then, so the house does not look empty. Our guide on making an empty house look lived in has more.

What it costs: a simple plan

Common mistakes to avoid

• Leaving the garage open "for a minute." Minutes are all it takes.
• Keeping the remote in the car. A stolen remote opens the whole garage.
• Using an obvious code. Change it from the default.
• Ignoring the cord. Check whether it can be reached from outside.
• Neglecting the house door. A strong garage door and a weak interior door is a half-measure.
• Using the manual lock with the opener plugged in. It can damage the door and the opener.

Frequently asked questions