What a smart lock is good at
- Codes instead of keys. Give the cleaner, the dog walker or a guest their own code, and delete it when they are done. Nothing to copy, nothing to get back.
- No more lockouts from forgotten keys. A keypad does not care that your keys are in the other bag.
- A record. Many models log which code opened the door and when, which settles questions a key never can.
- Rentals and short-term lets. A new code for every guest is the whole appeal.
What it is not good at
A smart lock is only as strong as its bolt and the strike it throws into. A well-made one on a properly fitted strike is as strong as a good deadbolt; a cheap one is a cheap deadbolt with a motor. It needs batteries, and a door that does not close square makes the motor strain and drains them in weeks. And if you never lend keys and never lock yourself out, it solves a problem you do not have: a good graded deadbolt does the security part for less. Our deadbolt page covers that option.
Keypad, Bluetooth or Wi-Fi?
- Keypad only. Codes, no app, no network. Simple and reliable, and all most people need.
- Bluetooth. Adds an app that works when you are near the door, plus guest keys on phones.
- Wi-Fi or a hub. Lets you lock, unlock and see the log from anywhere, and links to voice assistants. More features, more to go wrong, and it depends on your home network.
When the battery dies
You get warnings for weeks: a beep, a light, a notification. If you miss them, most models have a key cylinder as a backup, and some have terminals for a 9-volt battery held against the outside to power the keypad long enough to enter a code. Our dead battery guide goes through each option. The practical rule is simple: keep the backup key keyed to your house and somewhere you can reach it.
Who should get one
Families with teenagers who lose keys, anyone who gives access to cleaners, carers or contractors, landlords and short-term hosts, and anyone who has been locked out more than once. Who should skip one: a door that is out of alignment until it is fixed, and anyone who will not change batteries.
Getting it fitted properly
Most smart lock problems we see are fitting problems: a bolt that drags, a strike held by short screws, a lock on a door that does not close square. We check the door first, fit the lock so the bolt throws freely, set up the codes and the app with you, and key the backup cylinder to your other doors. You can buy the lock yourself or ask us to recommend one; see our smart lock page.
Questions people ask
Are smart locks easy to hack?
A well-made lock from an established brand, kept updated, is not the weak point of a house. The bolt, the strike and the door frame matter far more than the electronics.
How long do the batteries last?
Usually months to a year, depending on the model and how often the door is used. A door that makes the bolt drag drains them much faster.
Can I keep my existing deadbolt?
Some models fit over your existing deadbolt on the inside and keep the outside as it is. Others replace it completely.
Can the backup key match my other doors?
Usually yes. The key cylinder on most smart locks is an ordinary cylinder that can be rekeyed to your house key.