How to choose a smart lock

Updated June 2026Independently researchedNo paid placement.

What are the three connectivity types and their real trade-offs?

The biggest differentiator among smart locks is how they connect to your network. Wi‑Fi locks talk directly to your router, giving you full remote access without extra hardware, but that constant link drains batteries significantly faster, often requiring changes every few months. Z‑Wave and Zigbee locks are more battery friendly (many last a year or more) because they’re usually idle until a hub wakes them. The catch: you need a compatible hub like a SmartThings, Wink, or Hubitat to reach them from afar. If you already run a smart home system, these integrate smoothly; if not, you’re adding cost and complexity. Bluetooth locks are the simplest and cheapest, but remote access is limited unless you pair them with a Wi‑Fi bridge (sold separately). They’re great for single‑door, in‑range use, but you won’t be unlocking from the office or granting entry to a guest while you’re away unless you add a bridge.

What does the ANSI/BHMA grade mean and why does Grade 1 matter?

ANSI/BHMA grades rate a lock’s durability and security. Grade 1 is the highest, tested to survive repeated forced entry attempts and hundreds of thousands of cycles. Grade 2 is still good for residential, and Grade 3 is the minimum standard for interior doors. For an exterior door that takes the brunt of weather and daily use, Grade 1 gives real peace of mind. Many top‑tier smart locks advertise Grade 1 certification, but you should verify it on the product page or packaging. If you see Grade 2 or 3, it’s fine for a back door or less‑trafficked entry, but the best protection for a front door comes from Grade 1 hardware.

How do I know if my door is compatible with a smart lock?

Before you buy, confirm three measurements: backset (the distance from the edge of the door to the center of the deadbolt hole, usually 2⅜ or 2¾ inches), cross bore (the large hole for the lock body, typically 2⅛ inches), and deadbolt hole size (often 1 inch). Most smart locks are designed to fit these standard door preps, but older or custom doors may need adapters or re‑drilling. Also check if you want to keep your existing deadbolt. Some smart locks replace only the interior thumb turn, letting you re‑use the deadbolt mechanism and key outside. Others replace the entire assembly. If you like your current key or have a smart home that uses a specific brand, that might steer your choice.

Which features are worth paying for and which are overhyped?

Absolutely worth it: a Grade 1 certified body for durability, auto‑lock that engages after a set time (prevents leaving the door unlocked), and an app that uses end‑to‑end encryption (most reputable brands do). Keypad entry is also genuinely useful for guests or when you don’t want to carry keys. Skip the built‑in alarm sensor if your lock is on a frequently used door, it tends to false‑trigger from wind or rattling. Fingerprint readers integrated into the door hardware often fail in rain, heat, or cold, and they add significant cost without a meaningful benefit over a simple keypad. A voice assistant integration (Alexa, Google) is nice, but make sure it works through your existing ecosystem rather than a separate skill that may be dropped.

What’s the reality of battery life versus manufacturer claims?

Manufacturers often quote battery life under ideal conditions: moderate use, mild temperatures, and Wi‑Fi locks that aren’t polling constantly. In real‑world use, Wi‑Fi locks may need fresh batteries every two to four months, while Z‑Wave or Zigbee locks can last six months to a year. Bluetooth locks fall somewhere between, especially if you’re frequently using the app. Cold weather zaps battery life, as does a poor Wi‑Fi signal that forces the lock to retransmit. Many locks send a low‑battery alert, but if you ignore it, you could be locked out. Some models allow a temporary power boost from a 9V battery held to the terminals, look for that as a backup feature.

What three questions should I answer before buying?

First: does your door support a deadbolt? If your door has only a spring latch or a non‑standard prep, you may need to modify or replace it. Second: do you need remote access? If you frequently let in guests or want to check lock status from work, Wi‑Fi or a Z‑Wave hub is essential. If you’re usually at home, a Bluetooth lock with a keypad is cheaper and simpler. Third: do you already have a smart home hub? A Z‑Wave or Zigbee lock can join your existing system without adding another hub, but if you have no hub, a Wi‑Fi lock is the easiest plug‑and‑play option. Matching your lock to your current ecosystem (or lack thereof) saves money and headaches.

Frequently asked questions