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Smart Locks

The device that has to work when the network doesn’t — so buy for the mechanics first and the app second.

A retrofit smart lock cylinder fitted over a front door lock

A smart lock has one job that overrides every other feature: it has to open the door when you need it to, including when the Wi-Fi is down, the app has crashed, or the battery is at 4%. Everything else — auto-lock, geofencing, guest codes — is worth having, but it is a poor trade for a lock that strands you outside because a server somewhere is unreachable.

In Europe most smart locks are retrofit motors that clamp onto your existing Euro-cylinder and turn the same key-shaped stub your physical key already turns, rather than replacing the whole lock body. That means the mechanical lock stays underneath, you keep a physical key as a fallback, and installation is a five-minute job with a screwdriver rather than a locksmith call-out. The UK and North America more often use full-body replacement locks that swap the entire cylinder and deadbolt.

The other decision that matters is local versus cloud. A lock that talks Zigbee, Z-Wave, Matter or Bluetooth to a hub you own keeps working when your internet does not. A lock that depends on the manufacturer's cloud for remote unlock still works locally at the door, but geofencing, guest access and remote unlock all stop the moment their servers do.

What to look for

Retrofit vs full-body replacement

A retrofit motor (Nuki, Tedee, Danalock, LOQED, Aqara's U100) clamps over your existing Euro-cylinder in minutes and keeps your key working underneath. A full-body lock (Yale Linus, most US-market locks) replaces the cylinder and deadbolt entirely, needs the door prepped for it, and usually needs a locksmith if it goes wrong.

Local control vs cloud dependency

Zigbee, Z-Wave, Matter or a hub-paired Bluetooth connection lets your automation hub trigger the lock without a round trip to the manufacturer's servers. Purely app-and-cloud locks still open at the door by Bluetooth when offline, but lose remote unlock, guest codes and geofencing during an outage.

Entry methods beyond the app

A keypad, fingerprint reader or NFC tag matters more than the app for a household with kids, guests, or a cleaner. Some locks bundle these; most sell them as a separate accessory that adds real cost.

Auto-lock and auto-unlock reliability

Auto-lock on a timer is simple and reliable. Geofence-based auto-unlock is the feature people love in theory and disable in practice, because phone GPS drift causes false triggers at a door that really should not open by accident.

Battery life and low-battery behaviour

Retrofit motors that physically turn a cylinder draw far more current than a passive sensor, so expect 3–9 months rather than years. Confirm the lock warns well before it dies, and check whether it can still be opened by physical key when the battery is flat — it always should be.

Fire safety and egress

A door that only unlocks by app or code can become a trap in an emergency if the phone is dead or the code forgotten under stress. Keep a physical key readily accessible, and check local fire regulations before smart-locking an only escape route.

The shortlist compared

BrandModelTypeProtocolBattery lifeIndicative price
NukiSmart Lock Pro (4th Gen)Euro-cylinder retrofitMatter over Wi-Fi / Bluetooth~6 months€219
TedeeTedee ProEuro-cylinder retrofitBluetooth + bridge~9 months€219
AqaraSmart Lock U100Euro-cylinder retrofitMatter over Bluetooth/Thread~6 months€150
DanalockV3Euro-cylinder retrofitZ-Wave / Bluetooth~6 months€180
LOQEDTouch Smart LockEuro-cylinder retrofit, built-in keypadWi-Fi / Bluetooth Thread~12 months€270
YaleLinus L2Full-body replacementMatter over Wi-Fi / Bluetooth~6 months€200
SwitchBotLock ProEuro-cylinder retrofitMatter over Bluetooth~5 months€130

Prices move constantly and vary by country, so we give an indicative band rather than a figure that would be stale within a month. Check the brand's own store for the current price.

The picks in detail

Nuki Smart Lock Pro (4th Gen)

Matter over Wi-Fi / Bluetooth

The default recommendation for European Euro-cylinder doors, and for good reason: Nuki has iterated this product for a decade, and the mechanics are the most refined in the category. It clamps over the existing thumb-turn, keeps the physical key working, and the Pro adds a built-in Wi-Fi bridge so it doesn't need Nuki's separate Bridge accessory for remote access.

Matter support means it pairs directly with Apple Home, Google Home, Alexa or a Matter-capable hub without going through Nuki's own cloud for local commands. The company has also been unusually transparent about local API access for people who want to script around it.

  • Fastest, quietest motor in this category
  • Matter over Wi-Fi and Bluetooth, no separate bridge needed on the Pro
  • Well-documented local API
  • Premium price for the Pro tier
  • Cylinder measurement mistakes are the most common installation failure

Tedee Pro

Bluetooth + Tedee Bridge

Tedee's selling point is battery life: the Pro claims roughly double the cycles of most retrofit motors on a comparable battery, which in practice means fewer nights spent worrying whether the lock will make it to morning. The body is also notably compact, sitting flatter against the door than Nuki's or Danalock's.

The trade-off is that remote access and automation both need the separate Tedee Bridge accessory, which is an extra purchase most competitors have started building in.

  • Best battery life in the category
  • Compact, low-profile body
  • Auto-lock and pull-to-open gesture both work reliably
  • Bridge sold separately for remote/automation access
  • Smaller install base than Nuki, fewer third-party integrations

Aqara Smart Lock U100

Matter over Bluetooth / Thread

Aqara undercuts Nuki and Tedee on price while still shipping Matter support, which makes it the value pick for anyone already inside Aqara's ecosystem of sensors and hubs. Fingerprint and keypad entry are available as bundled options rather than pricey add-ons.

It is a newer entrant to European retrofit locks than Nuki, so the long-term reliability track record is shorter, but early reviews are positive and Aqara's hardware quality elsewhere in this guide's other categories has generally held up.

  • Lowest price among Matter-certified retrofit locks here
  • Fingerprint and keypad bundles are competitively priced
  • Aqara hub ecosystem integration if you already own their sensors
  • Shorter track record than Nuki or Danalock in this category
  • Thread requires a Thread border router to use that path

LOQED Touch Smart Lock

Wi-Fi / Bluetooth Thread

LOQED's distinguishing feature is a built-in touch keypad on the lock body itself, so there's no separate keypad accessory to buy, mount and pair. It also ships with a physical Wi-Fi-connected "Open Sesame" style contact point that most rivals treat as an upsell.

It's the most expensive lock here, and the touch keypad's battery drain is real — expect the shortest replacement interval in this list if guest codes get heavy daily use.

  • Keypad built into the lock body, nothing extra to buy
  • Excellent auto-calibration during install
  • Strong guest-code management in the app
  • Most expensive lock in this guide
  • Heavier keypad use shortens battery life

Yale Linus L2

Matter over Wi-Fi / Bluetooth

Yale is one of the very few mainstream lock brands offering a genuine full-body Matter lock rather than a retrofit motor, which matters for UK and North American doors that don't use a Euro-cylinder thumb-turn. Build quality benefits from decades of Yale's core lock-making business.

Full-body replacement means professional fitting is worth budgeting for unless you're comfortable with a door lock installation, and the deadbolt option needs the door prepped to accept it.

  • Full-body Matter lock, works on non-Euro-cylinder doors
  • Yale's long-standing physical lock engineering
  • Wide accessory ecosystem (keypads, view, doorbell)
  • Full-body install is more involved than a retrofit clamp
  • Matter feature set has lagged slightly behind Yale's own app

SwitchBot Lock Pro

Matter over Bluetooth

SwitchBot's Lock Pro is the budget entry with Matter certification, aimed at people who want the category without the premium-brand price. It pairs with SwitchBot's own optional keypad and works reasonably well as a first smart lock.

The trade-off is a noisier, slower motor than Nuki or Tedee, and SwitchBot's build quality, while adequate, doesn't match the decade of refinement behind the market leaders.

  • Cheapest Matter-certified retrofit lock here
  • Works with SwitchBot's broader ecosystem of buttons and hubs
  • NFC card entry supported
  • Slower, noisier motor than premium alternatives
  • Shorter battery life under heavy use

If a smart lock feels like overkill

A keypad-only mechanical lock (no app, no Bluetooth) solves the "forgot my key" problem for a fraction of the price and never has a battery-dies-in-winter moment. It just can't auto-lock, log entries, or issue time-limited codes. If those three features aren't the point for your household, this is the honestly better buy.

Further reading

Frequently asked questions

Will a smart lock fit my door?

Retrofit motors need a standard Euro-cylinder with a thumb-turn on the inside face — the norm across most of continental Europe. Measure the cylinder's exterior and interior length before buying; an ill-fitting cylinder is the single most common return reason. UK and North American doors more often need a full-body replacement lock instead.

What happens if the battery dies?

Every lock in this guide can still be opened with a physical key when the battery is flat, and all of them warn well in advance in the app and usually with an audible or LED alert on the lock itself. Never buy a lock, however convenient, that removes the physical key fallback entirely.

Is Bluetooth-only remote unlock actually reliable?

At the door, yes — Bluetooth range is a few metres and doesn't depend on your home network. Remote unlock from outside Bluetooth range needs either a bridge accessory, a Wi-Fi-connected version of the lock, or a Matter/Thread border router relaying the command, so check which path a given model uses before assuming remote access is included.

Do smart locks work during a power cut?

Yes for the lock itself, since it runs on its own battery, not mains power. What stops working is anything that depends on your home network or internet — remote unlock, notifications, and hub-based automations — until power and Wi-Fi return. Bluetooth unlock at the door keeps working.

Can I keep using my existing keys?

With a retrofit motor, yes — the motor turns the same thumb-turn your key already turns, so the mechanical lock and its keys are unchanged underneath. With a full-body replacement lock, the manufacturer usually supplies new keys as a backup, and your old keys stop working.

Terms explained

Euro-cylinder
The standard lock cylinder profile used in most of continental Europe, identified by its keyway shape and measured by the length of each side of the cylinder from the mounting plate.
Retrofit motor
A smart lock that clamps over an existing cylinder's thumb-turn and turns it electronically, leaving the mechanical lock and physical key unchanged.
Geofencing
Using a phone's GPS location to trigger an action — here, unlocking automatically as you approach the door. Prone to false triggers from GPS drift.
Auto-lock
A timer-based feature that locks the door automatically a set number of seconds or minutes after it is closed, regardless of phone location.

More terms in the smart home glossary. Related questions: Which protocol is best for smart locks? How secure is a smart lock?