Before you buy a smart lock, check these 7 things
Key takeaways
- Check your door first: lock type, thickness and handing decide what will physically fit.
- A physical key or external power backup matters more than any app feature when batteries die.
- Matter support and offline behaviour decide whether the lock keeps working when your Wi-Fi or a vendor's servers do not.
Last updated: 14 October 2026
A smart lock is the one gadget in your home that fails at the front door, so the boring checks matter more than the app. Apple's Welcome Home event on 13 October pushed smart locks back into the conversation, and our coverage of what to expect from the event and Apple's deal with LG explains why. Whichever brand you consider, run through these seven points first.
Check the door and the lock fit
Start with the door. Most smart locks replace the thumb turn on a standard euro cylinder or a US deadbolt, but door thickness, cylinder length and the handing of the door all change what fits. Measure before you look at any product page. Some locks need a specific cylinder length, and some will not work with multipoint locks at all.
Look at Matter and Thread support
Matter is the shared smart home standard, and a lock that supports it should work with Apple Home, Google Home and Alexa without a separate bridge. Thread, the low-power mesh it can run on, usually means better battery life than plain Bluetooth or Wi-Fi. Ask which one the lock uses, because the two get confused on product pages. You can browse Matter smart locks on Amazon to compare listings.
Plan for dead batteries
Check the battery type, the claimed life and, more importantly, what happens at 20%. A good lock warns you for weeks. It should also have a physical key or a way to jump-start it from outside, such as contacts for a 9V battery. If the lock has neither, you are one flat battery from calling a locksmith.
Test what works offline
Ask what still works when the internet drops. A lock that needs a vendor's cloud to open for guests is a risk, and so is one that stops accepting codes when your router restarts. Keypad and fingerprint entry should work locally. Remote unlock can be the part that needs the internet.
Read the privacy policy
Door lock logs show when you come and go. Find out where they are stored, how long, and whether the company shares them. Local storage or end-to-end encrypted logs are better answers than a vague line about improving services.
Check insurance and your landlord
Some home insurers require locks to meet a specific standard, so check your policy before you fit one. Renters should also check the lease, since changing a lock may need written permission. Established brands such as Yale usually publish their certifications, which makes comparison easier.
Think about who needs access
Count the people who need to get in, and how. Family, cleaners and guests each want different things: a code, a tag, a temporary link. Check how many codes the lock holds and whether you can set time limits.
Our recent look at Wi-Fi 8 routers makes a similar point: the newest hardware is not always the safest buy. For a front door, a mature lock with a real key backup beats a clever one without.
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