Smart locks let you unlock your front door with your phone, set time-limited codes for guests, and get a notification every time the door is opened or closed — all without changing your existing deadbolt. After testing the options available in the UK market, here are the locks we recommend.
Quick Comparison
| Lock | Type | Fits UK Doors | Insurance | Price |
|---|---|---|---|---|
| Yale Linus Smart Lock | Overlay (no cylinder change) | Yes — euro cylinder | BS3621 retained | ~£190 |
| Nuki Smart Lock Ultra | Overlay | Yes — most euro cylinders | Depends on existing lock | ~£229 |
| Ultion Nuki | Cylinder replacement | Yes — standard UK sizes | BS3621 + Sold Secure Diamond | ~£199 |
| Yale Conexis L2 | Cylinder replacement | Yes — multipoint compatible | BS3621 compliant | ~£259 |
| Sifely Smart Lock | Cylinder replacement | Yes — euro cylinder | Check before buying | ~£89 |
A Quick Note on UK Door Standards
Most UK home insurance policies require a BS3621 five-lever deadlock on the front door. A smart lock that replaces or bypasses this can invalidate your cover. Always check with your insurer before fitting any smart lock, and look for locks that are either BS3621 compliant or retain your existing cylinder’s certification.
UK doors also commonly use multipoint locking systems — where the door locks at three or more points when you lift the handle. Most overlay-style smart locks (Yale Linus, Nuki) work on the deadbolt portion only and are compatible with multipoint systems, since the multipoint lock operates separately.
Best Smart Lock UK: Yale Linus Smart Lock
The Yale Linus is our top pick for most UK homes. It fits over your existing euro cylinder without replacing it, meaning your insurance compliance is completely unaffected. Setup takes around 20 minutes, and the Yale app (Android and iOS) is one of the most polished in this category.
What we like: Retains your existing lock, excellent app, works with Google Home and Alexa, auto-lock option, digital key sharing for guests. Also compatible with the Yale Smart Living Hub for Z-Wave integration.
What to watch: No keypad included as standard (sold separately for ~£40 extra). Requires AA batteries (typically 6–12 months). Works over Bluetooth direct from your phone, or over Wi-Fi via the optional hub.
Check the Yale Linus price on Amazon UK →
Best for Security: Ultion Nuki
If you want the highest level of physical security alongside smart features, the Ultion Nuki is the answer. Ultion cylinders are independently rated to Sold Secure Diamond — the highest UK physical security rating — and the cylinder is designed to resist drilling, picking, and snapping (a common attack vector on euro cylinders).
The Nuki software platform is excellent: it has an open API, works with Matter, Alexa, Google Home, Apple HomeKit, and Home Assistant. The Ultion Nuki ships as a complete cylinder replacement including the Nuki smart module, so everything arrives in one box.
Who it’s for: Anyone who wants top-tier physical security without compromising on smart home integration. Highly recommended if your area has a high rate of door snapping (check local police reports).
Check the Ultion Nuki price on Amazon UK →
Best for Renters: Nuki Smart Lock Ultra
The Nuki Smart Lock Ultra is an overlay lock that clamps onto your existing cylinder’s thumbturn — no drilling, no permanent modification. If you move or need to uninstall it, the door returns to exactly how it was. It takes around 5 minutes to fit and works with most euro cylinders found in UK rental properties.
The Ultra adds Matter support (over Thread), which makes it future-proof as the smart home ecosystem standardises. It also supports Apple Home, Google Home, and Alexa. The Nuki app is feature-rich, with access logs, auto-unlock as you approach home, and time-limited digital keys.
Check the Nuki Smart Lock Ultra price on Amazon UK →
Best for Multipoint Doors: Yale Conexis L2
The Yale Conexis L2 is designed specifically for UK multipoint doors — the kind with a handle that lifts to engage multiple bolts. Rather than adding to your existing cylinder, it replaces the entire lock cylinder and handle with a smart system that controls the full multipoint mechanism.
It comes with a key card, key fob, and a tag that can be added to a wristband. You can also add a Yale doorbell or keypad to build out a complete access system. BS3621 compliant and backed by Yale’s guarantee against lock snapping.
Check the Yale Conexis L2 price on Amazon UK →
Budget Option: Sifely Smart Lock
If cost is the priority, the Sifely range offers smart lock functionality at under £100. It replaces the euro cylinder and includes a keypad, fingerprint reader, app control, and key backup. The app and cloud integration aren’t as polished as Yale or Nuki, and you’ll want to check whether it meets your insurer’s requirements, but for a rental property, outbuilding, or secondary door it’s a reasonable option.
Check Sifely smart locks on Amazon UK →
What to Check Before You Buy
- Insurance: Confirm with your insurer that the lock you’re fitting maintains your cover
- Cylinder type: Measure your existing cylinder. UK euro cylinders are measured as “external mm/internal mm” (e.g. 35/35). Bring a tape measure before ordering
- Door type: Multipoint doors need a lock designed for them (Yale Conexis L2) or an overlay lock on the deadbolt only
- Connectivity: Decide whether you want Wi-Fi remote access built-in or are happy using Bluetooth only when you’re home
- Power: All smart locks run on batteries. Check battery life in the spec sheet and pick one with a low-battery alert
Our Verdict
For most homeowners: Yale Linus — simple to fit, doesn’t touch your insurance, and works with every major voice assistant. For maximum security: Ultion Nuki. For renters or temporary installs: Nuki Ultra. For multipoint doors: Yale Conexis L2.
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