Smart Sensors Door Window Motion Guide UK¶

Guide to smart sensors for UK homes covering door/window contact sensors, motion detectors, environmental sensors, and integration with smart home platforms for automation and security.

Smart Sensor Types and UK Applications¶

Four main sensor types: Door/window contact sensors (Aqara £12-£18, Eve £35-£45, Ring £20-£25). Motion sensors using PIR (Aqara £15-£20, Eve Motion £35-£45, Philips Hue £30-£40). Environmental sensors for temp/humidity (Aqara £10-£15, Eve Weather £40-£50). Water leak sensors (Aqara £15-£20, Eve Water Guard £45-£55). All battery-powered with 1-3 year life. Most need a hub (Zigbee for Aqara, Thread/Bluetooth for Eve).

Sensor Placement and Automation Ideas¶

Door/Window: Place on front/back doors, patio, ground-floor windows. Automations: turn on hall light when door opens after sunset, notification if door opens when away, trigger siren if window opens when armed. Motion: Hallways, landings, living rooms. Mount at 2.1-2.4m. Automations: night light at 20% brightness, turn off heating when no motion for 2 hours. Temperature: Living rooms, bedrooms, loft. Automations: trigger dehumidifier above 70% humidity, frost alert below 5C. Water leak: Near washing machines, under sinks, near boiler. Automations: urgent notification, trigger motorised valve to shut off mains water. Every UK home should have water leak sensors under the kitchen sink, near the washing machine, in the airing cupboard, and in the loft.

Specifications and Comparison¶

Sensor Type	Best Brand	Protocol	UK Price	Battery Life
Door/Window	Aqara	Zigbee	£12-£18	2 years
Motion PIR	Aqara, Eve	Zigbee, Thread	£15-£45	1-2 years
Temp/Humidity	Aqara, Eve	Zigbee, Thread	£10-£50	2 years
Water Leak	Aqara, Eve	Zigbee, Thread	£15-£55	2 years
Multi-sensor	Aqara, Eve	Zigbee, Thread	£30-£60	1-2 years

FAQ¶

Can smart sensors work without a hub?: Some connect via Bluetooth (Eve), but most need a hub. For reliable automation, a hub is recommended.
How long do sensor batteries last?: Most last 1-3 years on CR2032 or AA batteries. Door/window sensors last longer than motion sensors.
Are smart sensors worth it?: Yes - door/window sensors enhance security, motion saves energy, temperature improves comfort, water leak prevents flood damage. For more information see our Smart Plugs and Power Management Guide.

Last updated: 2026-05-31.

External Resources¶

For further information consult authority guidelines at the Royal Society for the Prevention of Accidents.