Smart Home Assistant
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Smart locks that work with Home Assistant

Most smart locks are designed for American deadbolts and simply don't fit British doors. Everything here works with UK euro cylinders or multipoint locks — retrofit motors like Nuki and SwitchBot that turn your existing key, and full replacements like the Aqara U200. Each card notes the Home Assistant integration path and, critically, what happens when the battery dies or the Wi-Fi drops.

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Frequently asked questions

Do smart locks fit UK doors?

Only some. UK doors use euro cylinders (uPVC and composite doors with multipoint locks) or mortice locks, not US-style deadbolts. Retrofit locks like Nuki, tedee and the SwitchBot Lock clamp over a euro cylinder with a thumb-turn — check your cylinder protrudes enough inside, and consider a 3-star cylinder upgrade (or the Ultion Nuki pairing) while you're at it.

Are smart locks safe to connect to Home Assistant?

Locks that integrate locally — Matter-over-Thread models like the Aqara U200, or Nuki via its local API — never expose your door to a vendor cloud, and Home Assistant keeps all lock events on your own hardware. Standard advice applies: secure your Home Assistant instance with strong auth before exposing any lock entity remotely.

What happens if the battery dies — am I locked out?

No, if you fit it sensibly. Retrofit euro-cylinder locks still accept your physical key from outside as long as you choose an emergency-function cylinder (key works even with the thumb-turn attached inside). Every lock here reports battery level to Home Assistant, so set a 20% alert and you'll never get close.