Best Motion Sensor Under £100
Find the best motion sensor under £100 for reliable home security without breaking the bank. We've compared specs, battery life, and owner reviews to find the top picks for your peace of mind.
Quick answer
The Yale Sync Smart Motion Sensor offers the best balance of reliability, battery life, and smart home integration under £100. For a budget-friendly alternative, the Ring Motion Sensor works seamlessly with Ring alarms and is easy to set up.
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Research updated June 2026.
Yale Sync Smart Motion Sensor
Reliable PIR sensor with excellent range and smart home integration.
| Product | Best For | Range | Rating | Price |
|---|---|---|---|---|
| Yale Sync Smart Motion Sensor | Overall | 12m | 4.7/5 | Under £100 |
| Ring Motion Sensor (2nd Gen) | Budget | 10m | 4.5/5 | Under £100 |
| Bosch Smart Home Motion Detector | Smart Home | 12m | 4.6/5 | Under £100 |
| Philips Hue Motion Sensor | Lighting | 8m | 4.4/5 | Under £100 |
| Fibaro Motion Sensor | Advanced | 10m | 4.3/5 | Under £100 |
Yale Sync Smart Motion Sensor
Best OverallPros
- Excellent detection range
- Long battery life
- Reliable smart home integration
Cons
- Requires Yale hub
- Limited to Yale ecosystem
The Yale Sync Smart Motion Sensor is a top performer in the under £100 category. It uses a passive infrared (PIR) sensor to detect movement up to 12 meters away, making it suitable for large rooms or hallways. Owner reviews consistently praise its reliability and the fact that it rarely triggers false alarms. The sensor communicates with the Yale Sync smart hub, which then sends alerts to your phone via the Yale app.
Battery life is rated at two years, which is competitive for this price range. The sensor is also weather-resistant, so it can be used outdoors under a covered porch. However, you do need a Yale Sync hub to use it, which adds to the overall cost if you are starting from scratch. For those already in the Yale ecosystem, this is the best motion sensor under £100.
Ring Motion Sensor (2nd Gen)
Best BudgetPros
- Very affordable
- Easy setup with Ring app
- Works with Ring Alarm
Cons
- Shorter battery life
- Requires Ring hub
The Ring Motion Sensor (2nd Gen) is the best budget option for those looking for a motion sensor under £100. It offers a 10-meter detection range and integrates seamlessly with the Ring Alarm system. Setup is straightforward through the Ring app, and the sensor can be placed on a shelf or mounted on a wall. Owner reviews highlight its ease of use and the reliability of the Ring ecosystem.
The main trade-off is battery life, which is rated at one year compared to the two years offered by the Yale. It also requires a Ring Alarm hub to function, so it is best for users who already have or plan to buy a Ring security system. For the price, it is a very capable sensor that does the job well.
Bosch Smart Home Motion Detector
Best Smart HomePros
- Excellent build quality
- Works with Bosch Smart Home Controller
- Pet immune
Cons
- Requires Bosch hub
- Slightly more expensive
The Bosch Smart Home Motion Detector is a premium option that excels in build quality and smart home integration. It features a 12-meter detection range and is pet immune, meaning it will not trigger false alarms from animals under 25 kg. The sensor works with the Bosch Smart Home Controller and can be used to trigger scenes, such as turning on lights or sending alerts. Owner reviews note its solid construction and the reliability of the Bosch ecosystem.
Battery life is rated at two years, matching the Yale sensor. The main downside is that it requires the Bosch Smart Home Controller, which is an additional investment. However, for those building a Bosch smart home system, this is the best motion sensor under £100 for seamless integration.
Philips Hue Motion Sensor
Best for LightingPros
- Perfect for Hue lighting
- Adjustable sensitivity
- Compact design
Cons
- Shorter range
- Only works with Hue Bridge
The Philips Hue Motion Sensor is specifically designed for the Hue lighting system. It has an 8-meter detection range and is best used to automate lights in hallways, bathrooms, or closets. The sensor can be adjusted for sensitivity and the duration lights stay on. Owner reviews appreciate its compact size and how well it integrates with the Hue app for creating custom automations.
Battery life is rated at two years, which is good. However, the sensor only works with the Philips Hue Bridge, so it is not suitable for general security purposes. It is the best motion sensor under £100 for those who want to automate their Hue lights and save energy.
Fibaro Motion Sensor
Best AdvancedPros
- Z-Wave compatible
- Temperature and light sensor
- Compact and stylish
Cons
- Shorter battery life
- Requires Z-Wave hub
The Fibaro Motion Sensor is an advanced option for those with a Z-Wave smart home system. It not only detects motion up to 10 meters but also includes a temperature sensor and a light sensor. This allows for more complex automations, such as turning on lights when motion is detected and the room is dark. Owner reviews highlight its versatility and the fact that it works with many Z-Wave hubs, including SmartThings and Homey.
Battery life is rated at 18 months, which is slightly less than the competition. It also requires a Z-Wave hub, so it is not a standalone device. For advanced users who want more than just motion detection, this is the best motion sensor under £100 for its additional features.
What to check before buying a motion sensor under £100
Before you buy a motion sensor under £100, consider the smart home ecosystem you already use. Most sensors require a specific hub to function, such as the Yale Sync, Ring Alarm, or Bosch Smart Home Controller. If you already have a hub, choose a sensor from the same brand for seamless integration.
Also check the detection range and angle. A 10-12 meter range is standard for indoor use, but you may need a wider angle for large rooms. Battery life is another factor, with most sensors offering 1-2 years on a single CR123A or AA battery. Finally, consider if you need pet immunity to avoid false alarms from pets.
Mistakes to avoid
A common mistake is buying a sensor that is not compatible with your existing smart home system. Always check that the sensor uses the same protocol (Z-Wave, Zigbee, or proprietary) as your hub. Another mistake is placing the sensor in a location with direct sunlight or near heat sources, which can cause false triggers.
Do not overlook the importance of mounting height. Most sensors are designed to be mounted 2 meters high for optimal coverage. Finally, avoid buying a sensor with a very short range for a large room, as it may miss movement at the edges.
FAQs
Do all motion sensors under £100 require a hub?
Most smart motion sensors under £100 require a dedicated hub to connect to your Wi-Fi and smartphone. Standalone Bluetooth sensors exist but are less common and have shorter range.
Can I use a motion sensor outdoors?
Some motion sensors under £100 are weather-resistant and can be used outdoors under a covered area. Always check the IP rating before outdoor installation.
How long do batteries last in these sensors?
Battery life typically ranges from 1 to 2 years depending on usage and the sensor's features. Sensors with additional sensors (like temperature) may drain faster.
Will a motion sensor work with Alexa or Google Home?
Many sensors work with Alexa or Google Home if they are connected to a compatible hub or bridge. Check the product specifications for smart assistant support.
What is pet immunity in a motion sensor?
Pet immunity means the sensor is designed to ignore movement from animals under a certain weight, usually 25 kg, to prevent false alarms from pets.
Can I use a motion sensor to turn on lights?
Yes, many motion sensors under £100 can be used to trigger smart lights if they are part of the same ecosystem, such as Philips Hue or Bosch Smart Home.
What is the difference between PIR and microwave sensors?
PIR sensors detect heat from living beings, while microwave sensors emit microwaves and detect reflections. PIR is more common and cheaper for home use.
How do I install a motion sensor?
Most sensors are battery-powered and can be placed on a shelf or mounted using included screws or adhesive tape. Follow the manufacturer's instructions for best placement.
Can I use a motion sensor without a subscription?
Yes, most motion sensors under £100 do not require a subscription for basic functionality. Some brands offer optional monitoring services for an extra fee.
What is the best motion sensor under £100 for a large room?
The Yale Sync Smart Motion Sensor and Bosch Smart Home Motion Detector both offer a 12-meter range, making them ideal for large rooms.
Our verdict
The Yale Sync Smart Motion Sensor is the best overall motion sensor under £100, offering a great balance of range, battery life, and reliability. For budget-conscious buyers, the Ring Motion Sensor (2nd Gen) provides excellent value and easy setup.