A smart lock should work reliably as a lock before it adds convenience as a connected device. Start with your door’s condition, then check the exact model’s fit and access options. App features cannot compensate for a deadbolt that scrapes the strike plate or a door that needs to be pushed hard to latch.
Check the physical fit first
Measure the door thickness, bore dimensions, and backset using the manufacturer’s template. Confirm whether you have a compatible single-cylinder deadbolt, a mortise lock, or another arrangement. Retrofit devices usually work with particular existing deadbolts; full replacement locks need their own dimensional checks. A product intended for a U.S. door is not guaranteed to fit every U.S. door.
Compare retrofit and replacement locks
| Option | What changes | What to verify |
|---|---|---|
| Retrofit | Often the interior mechanism | Deadbolt compatibility and retained key access |
| Full replacement | Exterior and interior lock hardware | Door dimensions, keying, finish, and mounting |
Choose access methods for your household
A keypad can let visitors enter without installing an app. A physical key or supported emergency power method can help if batteries fail. Remote control may need Wi-Fi, a bridge, a hub, or a compatible home controller. Bluetooth control near the door does not automatically mean access from another city.
Ask what works when the network is down
Check whether keypad entry, stored codes, and manual operation still work without internet. Keep account recovery information secure, but do not rely on cloud access as your only way in. Use individual guest codes where supported and revoke them when access is no longer needed.
Plan battery care and safe operation
Use the battery type specified by the manufacturer and respond to low-battery warnings. Test the deadbolt with the door open before testing with it closed. Verify that anyone inside can exit normally, including children and guests who may not know the app.
Start with our installation checklist. If you rent, read the renter-friendly security guide before changing hardware.
