Smart Lock: Is It Worth It?

More and more smart locks are being installed in Brussels, especially in new apartments and short-term rentals. Opening your door with your smartphone, granting temporary access to a relative, knowing in real time whether you locked up: the convenience is real. But a smart lock is still an electronic device — and that changes how you think about security. Here's an honest take, without the hype.

How a smart lock works

Most consumer models, like those from the brand Nuki, mount on your existing cylinder, on the inside. The motor turns the key for you; you therefore keep your mechanical lock and your physical keys as backup. Other systems replace the whole lock. In Brussels, cylinder mounting is the most common because it doesn't alter the door and suits apartment buildings.

The real Nuki compatibility check

Before buying, check whether your cylinder is compatible with Nuki: cylinder type, inside projection, thumbturn or key on the inside, available length and emergency access with a physical key. If the cylinder is not compatible, we can first fit a security cylinder that works with Nuki.

The real benefits

• No more key left inside: you open with the phone, a code or a badge.
• Temporary access: very handy for a cleaner, a relative or an Airbnb guest, with no key copy circulating.
• History and notifications: you see who comes in and when, and you get an alert if the door stays open.
• Auto-locking: the door locks itself, no more "did I lock up?".

The limits to know before buying

Let's be clear: a smart lock is not armour plating. It improves convenience and access control, not necessarily resistance to break-ins. A few points of caution:

• Security depends on the cylinder underneath: a smart module on a low-end cylinder doesn't protect better. Start with a good certified security cylinder.
• Battery: like any device, it runs down. Always keep the mechanical backup access.
• Electronic faults: temperamental Bluetooth, an app that crashes after an update — it happens. It's actually one of the call-outs we see most with these models.
• Apartment buildings: on a landing door, check what the co-ownership rules allow.

Smart locks and short-term rentals (Airbnb)

For Airbnb hosts in Brussels, the smart lock is almost essential: it avoids handing over keys in person and lets you generate a unique code per stay. Do remember to pair the system with a reliable mechanical lock and to plan a backup in case of failure, so you never leave a traveller stuck at the door.

Our recommendation

A smart lock is an excellent complement, provided you respect the order of priorities: first a quality cylinder and lock, then the smart layer for convenience. If you fit a module on a weak door, you add convenience without adding security.

Unsure about the model or compatibility with your door in Brussels? We install and service Nuki smart locks, and our Nuki lock installation page explains models, compatibility checks and configuration. Call 0495 205 400 for advice tailored to your setup.