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Google never built a traditional alarm system that works straight out of the box. The Nest Secure, which was the closest thing to one, was discontinued in 2020. But that does not mean you cannot put together a solid home security setup using the Google Home ecosystem. In 2026, you can combine Nest cameras, third-party sensors, the ADT+ partnership, and Google Home routines to create a system that alerts you when something is wrong and lets you check on your house from anywhere.
The catch is that Google’s approach to home security has always been more about cameras and awareness than about sirens and door sensors. If you want a plug-and-play alarm with professional monitoring, Google points you toward ADT. If you want a flexible DIY setup, you can piece one together using Matter-compatible sensors and Google Home automations. Both paths work, but they require different budgets and different expectations.
Can You Use Google Home as an Alarm System
Not in the way a dedicated alarm panel from Ring or SimpliSafe works. Google Home is a smart home platform, not a purpose-built security system. There is no Google-branded alarm keypad, no entry delay timer built into the app, and no siren that goes off when a sensor trips.
Comparing Apple and Google? See our Google Home vs HomePod breakdown.
What Google Home can do is act as the hub for a security-oriented setup. You can connect Nest cameras and doorbells to monitor entry points. You can add Matter-compatible door and window sensors that trigger alerts on your phone. You can build routines that flash your lights, play a loud tone on your Nest speakers, and send you a notification when a sensor detects an opening. Pair all of that with professional monitoring through ADT+, and you get something that functions like an alarm system even if Google does not market it that way.
The Google Home app received a major redesign in late 2023 and has been steadily gaining features since then. By 2026, it supports automations based on sensor states, camera-based activity detection, and household presence sensing. These building blocks are enough to create basic alarm-like behavior without buying into a traditional security brand.
What Happened to Google Nest Secure
Google launched Nest Secure in 2017 as a home alarm system with a central hub called Nest Guard, small wireless sensors called Nest Detects, and key fobs called Nest Tags. It was a clean, well-designed product. The Nest Guard doubled as a motion sensor and had a built-in keypad for arming and disarming. Nest Detects stuck on doors and windows to monitor openings and movement.
Google discontinued Nest Secure in 2020 and stopped selling it entirely. Existing units continued to work for several years, but Google ended support in April 2024. If you still have Nest Secure hardware, it no longer receives updates or connects to Google’s servers. There is no direct replacement from Google.
The reason Google pulled out of the alarm business was strategic. Rather than compete with Ring, SimpliSafe, and ADT on alarm hardware, Google partnered with ADT to combine Nest cameras and sensors with ADT’s monitoring infrastructure. That partnership became the foundation of the ADT+ system, which is now the closest thing to an official Google-powered alarm.
How Does the ADT and Google Partnership Work
ADT+ (previously called ADT Self Setup) is a security system that uses Google Nest hardware for cameras and the Google Home app for control, paired with ADT’s 24/7 professional monitoring network. It launched in 2023 and has expanded since then.
When you sign up for ADT+, you get a starter kit that typically includes a Nest Hub (which serves as the control panel), a Nest Doorbell, door/window sensors, and a motion detector. You set everything up yourself through the Google Home app. ADT handles the professional monitoring side, meaning a trained operator contacts you and dispatches emergency services if an alarm triggers and you do not respond.
The monthly monitoring fee for ADT+ starts at around $20 per month. That is significantly less than traditional ADT plans, which often ran $45-$60 per month with long-term contracts. ADT+ plans are month-to-month with no multi-year commitment required. You can add Nest Cams, additional sensors, and smart locks as you expand.
The main advantage of ADT+ over a pure DIY approach is the professional monitoring. If your phone is off, your internet goes down, or you are asleep, someone at ADT’s monitoring center still sees the alert and can act on it. For many homeowners, that peace of mind is worth the monthly fee.
Google Home Compatible Security Cameras and Sensors
The Google Home ecosystem supports several categories of security devices. Here is what works in 2026.
| Device | Type | Price (approx.) | Key features |
|---|---|---|---|
| Google Nest Cam (battery) | Outdoor/indoor camera | $180 | Wire-free, person/animal/vehicle detection, 3-hour free event history |
| Google Nest Cam (wired, indoor) | Indoor camera | $100 | 24/7 recording with Nest Aware, compact design |
| Google Nest Cam with Floodlight | Outdoor camera + light | $280 | 2400-lumen floodlight, HDR, two-way audio |
| Google Nest Doorbell (battery) | Video doorbell | $180 | Package detection, familiar face alerts, 3-hour event history |
| Google Nest Doorbell (wired, 2nd gen) | Video doorbell | $150 | 24/7 continuous recording, HDR, hardwired power |
| Matter door/window sensors (third-party) | Contact sensor | $15-$30 each | Works with Google Home via Matter, triggers automations |
| Matter motion sensors (third-party) | Motion sensor | $20-$35 each | Detects movement, triggers routines |
| Google Nest Hub (2nd gen) or Nest Hub Max | Smart display | $100-$230 | Camera feeds, alarm controls, intercom |
Google does not make its own standalone door or window sensors anymore. Since the death of Nest Detect, the company relies on third-party sensors that connect through the Matter smart home standard. Brands like Aqara, Eve, and Thirdreality make Matter-compatible contact sensors and motion detectors that pair directly with Google Home. The Matter protocol means these sensors work locally without depending on a separate manufacturer’s cloud, which improves reliability.
How to Set Up a DIY Alarm System with Google Home
You do not need ADT or any monitoring subscription to build a basic alarm setup with Google Home. Here is how to put one together using off-the-shelf hardware and Google Home routines.
- Choose your sensors. Pick up Matter-compatible door/window contact sensors for your main entry points (front door, back door, garage entry). Add a motion sensor for hallways or rooms with valuables. Aqara Door and Window Sensor P2 and Eve Door and Window are reliable options that work with Google Home through Matter.
- Add cameras to cover the exterior. Mount a Nest Doorbell at your front door and a Nest Cam at the back of the house. Position them so you can see anyone approaching. Battery models work if you do not have exterior wiring, but wired models are more reliable for 24/7 coverage.
- Set up Google Home routines for alerts. Open the Google Home app, go to Automations, and create a new household routine. Set the starter as a sensor state change, for example “when the front door sensor opens.” Add actions like sending a notification to your phone, playing an alert sound on all Nest speakers, and flashing smart lights red. You can build separate routines for each sensor or group them.
- Create an “away” routine. Build a routine called “Arm Security” that you trigger manually through the app or with a voice command like “Hey Google, I’m leaving.” This routine can activate camera recording, enable motion sensor alerts, and turn on any connected smart lights on a random schedule to simulate occupancy.
- Set up a “home” routine. Create a matching “Disarm Security” routine triggered by “Hey Google, I’m home.” This disables the motion alerts and stops the fake occupancy light schedule so you do not get bombarded with notifications while you walk around your own house.
- Test everything. Open each door, walk through motion sensor zones, and verify that you receive notifications and that your speakers play the alert sound. Check camera feeds from the Google Home app to confirm positioning covers the right angles.
This DIY approach gives you notifications and deterrence (lights, sounds, cameras) but lacks professional monitoring. If someone breaks in while you are on a plane with your phone in airplane mode, nobody will call the police for you. That is the tradeoff.
How to Use Google Home App to Monitor Your House
The Google Home app is the control center for your entire setup. On the Favorites tab, you can pin your camera feeds so they appear front and center when you open the app. Tapping any camera shows the live feed with two-way audio, so you can talk to whoever is at the door or yell at a porch pirate in real time.
The Activity tab shows a timeline of events from all your cameras and sensors. Every time a camera detects a person, a sensor opens, or a routine fires, it logs the event with a timestamp. If you subscribe to Nest Aware, the timeline includes video clips and familiar face recognition.
Household presence sensing is a newer feature that uses the location of household members’ phones and the activity detected by Nest devices to determine whether anyone is home. When everyone leaves, Google Home can automatically switch to an “away” state that activates your security routines. When someone returns, it shifts back. This removes the need to manually arm and disarm, which is one of the biggest pain points with traditional alarm systems.
You can also view camera feeds on any Nest Hub display in your home. Say “Hey Google, show me the front door” and the Nest Hub pulls up the live feed from your doorbell camera. For a quick security check before bed, say “Hey Google, show me all cameras” to cycle through every feed.
Does Google Home Offer Professional Monitoring
Google itself does not offer professional monitoring. That service comes through the ADT+ partnership. Without ADT+, your Google Home setup is entirely self-monitored, meaning you are responsible for seeing alerts and deciding whether to call 911.
There is also Brinks Home, which has integrated with Google Home for monitoring in some configurations. However, the most streamlined option remains ADT+ because it was built specifically around Google Nest hardware and the Google Home app. Other monitoring providers may work with individual devices but typically require their own apps and hubs, which splits your experience across multiple platforms.
If professional monitoring is a must, ADT+ is the path of least resistance in the Google ecosystem. If you are comfortable self-monitoring and want to keep costs down, the DIY route with free Google Home routines and camera alerts works fine for many households.
Google Home Alarm System Cost Breakdown
Here is what you can expect to spend depending on the setup level you choose.
| Setup type | Hardware cost | Monthly cost | What you get |
|---|---|---|---|
| Basic DIY (self-monitored) | $300-$500 | $0 (free) or $8/month for Nest Aware | 2-3 sensors, 1 camera, 1 doorbell, Google Home routines, phone alerts |
| Mid-range DIY (self-monitored) | $600-$900 | $0-$15/month for Nest Aware Plus | 5-6 sensors, 2-3 cameras, doorbell, Nest Hub display, smart locks |
| ADT+ Basic | $200-$450 (starter kit) | $20/month | Door/window sensors, motion detector, doorbell, Nest Hub, ADT professional monitoring |
| ADT+ with added cameras | $500-$900 | $20-$25/month | Everything above plus Nest Cams, additional sensors, expanded monitoring |
| Full Nest + ADT+ premium | $1,000-$1,500 | $25-$35/month | Full camera coverage, many sensors, smart locks, smoke/CO detectors, premium monitoring |
Compared to traditional alarm companies, these costs are reasonable. A conventional ADT system with professional installation used to run $400-$800 for equipment plus $45-$60 per month on a 3-year contract. Ring Alarm Pro costs about $300 for hardware and $20 per month for monitoring. SimpliSafe runs $250-$500 for hardware and $18-$28 per month. The Google Home approach falls in the same range while giving you better cameras and tighter integration with the Google ecosystem you may already use.
What Is Nest Aware and Do You Need It
Nest Aware is Google’s subscription service for Nest cameras and doorbells. Without it, your cameras store up to 3 hours of event-based video clips for free. With Nest Aware, you get longer event history and additional features.
The Nest Aware plan ($8/month or $80/year) gives you 30 days of event video history for all your cameras. It also enables familiar face detection, which learns the faces of people you tag so it can tell you “Sarah is at the front door” instead of just “a person was detected.” For a security setup, familiar face alerts are genuinely useful because they filter out known visitors from potential intruders.
Nest Aware Plus ($15/month or $150/year) adds 60 days of event history and 10 days of 24/7 continuous video recording for wired cameras. Continuous recording means the camera stores everything, not just motion-triggered clips. If something happens that did not trigger the motion detector, you can still scrub back through the footage and find it.
For a security-focused setup, at minimum the base Nest Aware plan is worth it. Three hours of free event history disappears fast, and having 30 days of recorded events means you can go back and review footage after discovering a problem days later.
Google Home Security Routines You Should Set Up
Routines are the backbone of a DIY Google Home alarm system. Here are the most useful ones for security.
Goodnight routine: Trigger this by saying “Hey Google, goodnight.” Have it lock your smart locks, turn off interior lights, activate front and back camera motion alerts, and announce “all doors locked, cameras active” on your bedroom speaker.
Away routine: Trigger by saying “Hey Google, I’m leaving” or set it to activate automatically with household presence sensing. Actions should include activating all sensor alerts, enabling camera motion detection notifications, turning on a random light schedule to simulate someone being home, and locking all doors.
Intruder alert routine: Set this to trigger when a door sensor opens while your away routine is active. Actions should include playing a loud alarm sound on all speakers at maximum volume, flashing all smart lights, sending a notification to every household member’s phone, and starting recording on all cameras.
Doorbell routine: When the Nest Doorbell detects someone, announce on all speakers which door it is and show the camera feed on any Nest Hub displays. This works during the day when you are home and want to know who is at the door without checking your phone.
What Are the Limitations of Google Home for Security
No system is perfect, and Google Home has real gaps compared to dedicated alarm systems.
There is no cellular backup built into the Google ecosystem. If your internet goes down or someone cuts your cable, your cameras stop streaming and your sensors cannot send cloud-based alerts. ADT+ addresses this with optional cellular backup on some configurations, but a pure DIY Google Home setup relies entirely on your Wi-Fi and internet connection.
Google Home does not have a dedicated alarm panel with a keypad. You arm and disarm through the app or voice commands. Voice commands can be a security risk because someone outside might hear you say the disarm phrase. You can mitigate this with voice match (which recognizes your voice) or by using the app instead of voice.
There is no built-in siren. Traditional alarm systems have a loud siren that goes off during a break-in to scare off intruders and alert neighbors. With Google Home, the closest equivalent is playing an alarm sound through your Nest speakers, which tops out around 78 decibels. That is loud enough to be annoying but not nearly as piercing as a 100+ decibel dedicated alarm siren. You can add a smart plug-connected siren as a workaround.
Battery-powered sensors and cameras need regular charging or battery replacements. This is a maintenance task that dedicated alarm systems with hardwired sensors do not require. If a sensor battery dies and you do not notice, you have a gap in your coverage.
Frequently Asked Questions
Does Google make its own alarm system in 2026?
No. Google discontinued Nest Secure in 2020 and has not released a replacement. The closest official option is ADT+, which uses Nest hardware with ADT’s professional monitoring service. For a self-monitored setup, you can build one using Nest cameras, third-party sensors, and Google Home routines.
Can Google Home call 911 for me?
Google Home devices cannot call 911 directly. If you want emergency dispatch, you need professional monitoring through ADT+ or a similar service. The monitoring center contacts emergency services on your behalf when an alarm triggers and you do not respond to their verification call.
Do I need Wi-Fi for Google Home security to work?
Yes. All Google Home devices and most connected sensors require a Wi-Fi connection. Without internet, cameras cannot stream, sensors cannot send cloud notifications, and you lose remote access through the app. Some Matter sensors can trigger local automations through a Thread border router even without internet, but the experience is severely limited.
What is the best Google Home compatible door sensor?
The Aqara Door and Window Sensor P2 is a popular choice in 2026. It supports Matter over Thread, works directly with Google Home without needing an Aqara hub, is compact, and costs around $20. The Eve Door and Window sensor is another solid option, especially if you also use Apple HomeKit.
Is ADT+ worth the monthly fee?
If you travel frequently, sleep through phone notifications, or want someone to contact police and fire departments when you cannot, the $20 per month is reasonable. If you work from home, check your phone constantly, and live in a low-crime area, self-monitoring with free Google Home routines might be enough.
Can I use Ring sensors with Google Home?
Ring devices do not work with Google Home. Ring is an Amazon ecosystem product that integrates with Alexa but not Google. If you are committed to Google Home, look at Matter-compatible sensors from brands like Aqara, Eve, and Thirdreality instead.
Explore what Alexa can do with our best Alexa skills list.
For a full comparison of the two biggest smart home ecosystems, check our Google Home vs Alexa guide.
Sources:
- Google Store – Cameras and Doorbells
- Google Nest Help – Nest Aware Subscriptions
- ADT – ADT+ with Google Nest
- Google Nest Help – Household Routines
- Connectivity Standards Alliance – Matter
- Google Nest Help – Nest Secure End of Support
