Retrofit vs full lock replacement — which is right for most UK buyers?
A retrofit smart lock fits over your existing euro cylinder without changing the lock itself — your current keys continue to work and installation takes minutes. A full replacement changes the lock completely, costs more and typically requires a locksmith. For most UK buyers, a retrofit is the practical choice. Go for a full replacement only if you want the cleanest integrated look or are doing a new-build fit-out.
Euro cylinder compatibility — the key question for UK doors
Most UK front doors use a euro cylinder lock. Yale and Nuki are both designed specifically around euro cylinders. US brands like August and Schlage are primarily built for American deadbolts — check compatibility carefully if considering these options. The simplest check: look at your current door lock. If it has a keyhole on both sides with a cylindrical barrel between them, it is likely a euro cylinder.
Connectivity options explained
Bluetooth-only models are cheaper and do not require a hub, but can only be operated within Bluetooth range — typically 10 metres. For remote access from anywhere, you need Wi-Fi (built into some models) or a bridge device that connects the lock to your home network. Always factor in the bridge cost when comparing prices — some 'cheaper' locks need a £30–50 bridge to access their full features.
Are smart locks as secure as traditional locks?
A reputable smart lock is not weaker than a traditional lock — the physical lock mechanism remains the same. The addition of electronics adds a cyber-security dimension that a traditional lock does not have, but established brands like Yale and Nuki have strong security track records. Look for locks with tamper alarms, AES 128-bit or better encryption and automatic lockout after failed PIN attempts.
Sharing access and temporary codes
One of the most useful features of smart locks is remote guest access. Most apps let you send time-limited digital keys to guests, contractors or Airbnb visitors — access that expires automatically so you never need to worry about collecting keys back. Yale and Nuki apps both handle this well. August's expiry-date codes are particularly suited to frequent short-term access management.
Battery life and what happens when batteries die
Smart locks run on batteries — typically 4 AA batteries lasting 6–12 months. All reputable models send low-battery warnings via app before power is lost. If the battery does run flat, most models include a physical key override as backup. Check whether your chosen model has an external emergency power port (some accept a 9V battery pressed against the contacts to power the motor enough to unlock once).
