Are smart locks safe?

Reputable smart locks can be safe when they use strong encryption and retain a reliable backup way to enter.

Reputable smart locks are safe. Look for strong encryption, auto-lock, unique guest codes, and a physical key backup. Change default codes, update firmware, and use fresh batteries so you are not locked out.

Why the details matter

A smart lock is only as safe as its weakest setting. The hardware on most reputable locks is solid, but accounts get compromised through reused passwords, old firmware, and guest codes that were never deleted. Convenience features like auto-unlock also widen the door — sometimes literally — if you turn them on without thinking. Treat the lock like any other security device: set it up carefully, then maintain it.

What to do, step by step

1. Choose a reputable brand that uses strong encryption, offers automatic firmware updates, and still works with a physical key if the batteries or network fail.
2. Change every default code during setup, protect the app account with a unique password and two-factor authentication, and never reuse your email password.
3. Give each person their own guest code instead of sharing one master code. Delete codes promptly when a sitter, cleaner, or guest no longer needs access.
4. Turn on auto-lock so the door secures itself after a short delay, and check the activity log now and then for entries you do not recognize.
5. Replace batteries on a schedule rather than waiting for warnings, keep firmware updated, and test your backup key so you know it actually turns.