The Best Smart Locks of 2026 for Keyless Entry

It depends on the lock you already have. Retrofit smart locks such as Nuki are designed for euro-profile cylinders, the type common on European doors: they clamp onto the inside of the existing cylinder without replacing the lock. The cylinder needs to stick out slightly on the inside and have an emergency function, so a key still works from outside while the smart lock's own key stays in. Most US exterior doors use a deadbolt instead, so check that the model you pick is made for your door before you buy.

Usually not, because insurers look at the lock itself, its cylinder or deadbolt, not the motor mounted on it. Still, read the theft section of your policy: some set requirements for the locks on exterior doors, and some only pay out for a burglary when there are signs of forced entry. Entry with a shared code or a stolen phone leaves no trace, so it may not be covered. Retrofit models that turn your existing key leave the original lock in place, which avoids most problems.

Usually only with your landlord's permission, since many leases forbid changing or adding locks without consent. A retrofit model that mounts on the inside of the existing lock, with no drilling, is the easiest to get approved, because it comes off without a trace when you move out. If the cylinder or deadbolt has to be replaced, keep the original to put back later and give your landlord a key to the new one.

For a family, a keypad is the most practical: no phone needed, and you can give temporary codes to house cleaners, dog walkers or guests. Fingerprint readers are fast but can struggle with wet or cold fingers, so pick one that also has a keypad. App-only locks suit people who always carry a phone, ideally with auto-unlock as you arrive. Whatever you choose, keep a mechanical key or an emergency power option for when the batteries die.

Anywhere from a few months to around a year, depending on how often the door is used and whether the lock stays connected over Wi-Fi. Bluetooth-only locks, or those using a Thread or Zigbee bridge, generally last longer than models with built-in Wi-Fi. The app warns you when the batteries run low, and keypad models often have emergency contacts for a 9-volt battery or USB power from outside. Rechargeable packs are convenient, but a spare avoids downtime while one charges.