Smart locks vs traditional locks for UK homes
Smart locks have moved from novelty to mainstream fairly quickly, and it is easy to see the appeal: no more fumbling for keys, the ability to let a tradesperson or delivery driver in remotely, and a log of exactly when your door was opened and by whom. Traditional mechanical locks, on the other hand, are the thing every locksmith, insurer and burglar has understood for decades. Neither is simply better — the right choice depends on what you actually want from your front door.
Most smart locks fall into one of two categories. Some are a full replacement for the lock itself, opened by a keypad code, smartphone app, fingerprint or fob instead of a key. Others are retrofit devices — a smart cylinder or an add-on motor fitted to your existing mechanical lock — which keep the original lock in place and simply automate turning it. This distinction matters more than it might seem, particularly for insurance, which we come back to below.
The genuine advantages are real. You can grant temporary access to a dog walker, cleaner or guest without cutting a physical key and then chasing it back afterwards. Many models keep a log of who opened the door and when, which is useful if you want to know when family members got home or a delivery was made. There is no risk of being locked out because you left your keys inside, provided the app, code or battery is working.
The downsides are just as real. Smart locks depend on a battery, and a flat battery at the wrong moment can leave you locked out in a different way than usual. They rely on an app, a network connection or a hub working correctly, which introduces points of failure that a traditional key simply does not have. They also cost significantly more upfront than a standard mechanical lock, and if the underlying lock body is poorly made, no amount of smart technology fixed to the front of it will make your door genuinely secure.
Smart locks tend to find their strongest use case in situations where managing physical keys is genuinely inconvenient, rather than simply a novelty — short-term rental and holiday-let properties, homes with regular cleaners or carers, or households where several people need different, time-limited access. For a family home used mainly by the same few people every day, the practical benefit is often smaller, and the extra cost and added points of failure may not be worth it for everyone. It is worth being honest about which category your household falls into before spending several hundred pounds on a system you may end up using only for its basic locking function.
This is where things get important. Many UK home insurance policies still specify a mechanical standard — typically BS3621 for traditional doors or TS007 for UPVC and composite doors — as a condition of cover, regardless of what smart technology is also fitted. A smart lock marketed as secure is not automatically the same thing as an insurance-compliant lock: many smart locks are designed to be paired with, rather than replace, a compliant mechanical lock or cylinder underneath. Before relying on a smart lock as your main security, it is worth checking your insurer's specific wording and, ideally, asking a locksmith to confirm the mechanical lock behind it still meets the standard your policy requires.
For many UK homes, a sensible approach is a hybrid one: keep a mechanical lock that meets the relevant British Standard as the primary security, and add smart functionality — a smart cylinder, a video doorbell, or an app-controlled add-on — on top of it, rather than instead of it. This way you get the convenience without gambling your insurance cover, or your security, on a single piece of battery-powered electronics.
Whichever route you choose, a lock is only as good as its installation and maintenance. Smart locks in particular benefit from professional fitting, both to make sure the mechanical part underneath is genuinely secure and to avoid the kind of poor alignment that causes UPVC-style mechanisms to jam or fail — a problem covered in more detail in our article on UPVC door lock issues.
If you are weighing up a smart lock upgrade, a locksmith who works with both traditional and smart systems can talk through what will and will not affect your insurance before you buy anything. Our directory lists locksmiths across towns and cities in the UK who can advise on the right option for your door.
Frequently asked questions
It depends on the model and, crucially, on the mechanical lock underneath. Many smart locks are add-ons to a standard cylinder or deadlock rather than a full replacement, so the underlying mechanical lock still matters for real-world security.
Possibly. Many insurers require a specific mechanical standard, such as BS3621 or TS007, regardless of any smart technology fitted. Check your policy wording, and confirm with a locksmith that the mechanical lock behind your smart lock still meets it.
Most have a backup option, such as a physical key override or an external power connection to jump-start the battery, but this varies by model — worth checking before you rely on one as your only means of entry.
Not necessarily replace — many homeowners get the best result by keeping a compliant mechanical lock in place and adding smart functionality on top, which preserves insurance compliance while adding convenience.