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A detached garage can contain some of the most valuable property outside your home. Power tools, lawn equipment, bicycles and vehicles may all be stored there, often behind only a garage door or side entrance. Because the building sits away from the house, activity around it may also be harder to hear or notice at night.A home security system can extend protection beyond the main house, but distance creates a few additional considerations. Sensors need to remain within communication range of the security hub, while connected cameras need reliable Wi-Fi and power or sufficient battery life.ADT’s current system supports wireless door/window sensors and motion detectors, and the company also offers an Alarm Range Extender designed to increase communication range between the ADT Base and compatible sensors.So, what does it take to secure a detached garage effectively? Here’s everything you need to know.If you’re unsure whether your detached garage is within range of your existing system, ADT can evaluate the property and recommend sensor, camera and range-extension options.
What Is the Best Way To Secure a Detached Garage With an Alarm?
A strong detached-garage security setup combines entry sensors, interior motion detection and, where connectivity allows, exterior cameras. Professional monitoring can add another response path when the garage is unattended. But the right equipment depends on the garage layout and how far it sits from the house. Here are some items to consider:
Where It Helps
Side doors, windows and other accessible openings
Detects movement inside the garage
Monitors driveway and exterior approach
Helps compatible sensors communicate over greater distances
Provides 24/7 monitoring for supported alarm events
Helps keep the main system operating during outages
Start With Every Garage Door and Accessible Window
The first priority is detecting when someone enters the structure. Wireless contact sensors can be placed on compatible doors and windows to alert the security system when an opening is breached.
ADT specifically recommends door/window sensors for accessible entry points around a property. For a detached garage, that may include a side entry door and accessible windows in addition to the main garage door.
An interior motion detector can provide another layer of detection if someone enters through an opening that isn’t protected by a contact sensor. That combination is especially useful in workshops where high-value tools or equipment remain inside overnight.
Can ADT Sensors Reach a Detached Garage?
Potentially, but distance and construction matter. Wireless signals have to travel between the garage and the security system inside the house. Exterior walls, building materials and the distance between structures can all affect performance.
ADT offers an Alarm Range Extender specifically to extend communication between its Base and compatible sensors and detectors. The device also includes a 24-hour backup battery and tamper detection.
ADT does not publish a universal maximum distance for every installation, so homeowners shouldn’t assume an extender will reach any detached structure regardless of location. Testing the signal at the actual garage is more useful than relying on distance alone.
For garages farther from the house, professional installation can help determine whether sensors communicate reliably before the system is put into service. ADT currently offers a free consultation and quote that can help you get started.
Should You Put a Security Camera on a Detached Garage?
A camera can add useful visual coverage, particularly when pointed toward the garage door, driveway or approach to the building.
ADT outdoor cameras provide remote video viewing and alerts for detected activity. Current ADT outdoor camera options also support features such as night vision and notifications through the ADT+ app.
Camera placement has an important limitation, however: Wi-Fi coverage. ADT states that its outdoor cameras require a Wi-Fi connection. If the home’s wireless network barely reaches the garage, video can be less reliable even when alarm sensors communicate successfully through the security system.
That distinction matters because alarm sensors and security cameras may use different connections. Before installing a camera, test Wi-Fi performance from the exact mounting location.Related: How Much Does ADT Cost in 2026? Monthly Fees, Equipment and Installation Explained
Don’t Ignore Camera and Wi-Fi Security
A connected camera also needs basic cybersecurity protection. The Federal Trade Commission recommends securing home security cameras with strong passwords, keeping software updated and using WPA2 or WPA3 encryption on the home Wi-Fi network. The agency also recommends enabling additional security features, such as two-factor authentication when available.
Those precautions matter whether the camera watches the front porch or a detached workshop.
What Happens if the Power or Internet Goes Out?
Detached buildings can introduce another weak point if their security relies entirely on household internet: power outages. ADT’s current Base uses both Wi-Fi and cellular connectivity and includes a rechargeable battery rated for up to 24 hours of backup operation.
ADT says its use of both Wi-Fi and LTE provides redundancy for security communication. Cameras may still lose internet-dependent features during an outage, so backup cellular communication shouldn’t be confused with uninterrupted video service.
Is a Security System Worth It for a Detached Garage or Workshop?
A security system can be especially worthwhile when a detached building contains expensive tools, machinery, bicycles or vehicles that would be costly to replace. The important question is whether the equipment can reliably cover the building.
Door sensors and motion detection provide the foundation. Cameras can add visual monitoring when Wi-Fi coverage is strong enough, while a range extender may help compatible alarm sensors communicate across a larger property.
For homeowners who use a detached garage as a workshop, the ability to protect it through the same broader security system as the house can also simplify monitoring.
If you want to extend security to a detached garage or workshop, ADT can assess the layout and recommend equipment based on the distance, entry points and connectivity available on the property.
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