Best Smart Lock Under $200

Measure your door before you shop

More smart locks get returned over fit than over features. Ten minutes with a tape measure saves the whole exercise, and these are the four numbers.

Door thickness. Standard US exterior doors are 1 3/8" to 1 3/4". Most locks cover that range as standard; anything thicker needs an extension kit that may or may not exist for the model.

Backset. The distance from the edge of the door to the centre of the bore hole - almost always 2 3/8" or 2 3/4". Nearly all deadbolts ship with an adjustable latch covering both, but confirm it.

Bore hole diameter. Usually 2 1/8". A smaller bore means drilling, which is a different job.

Which way the door opens, and what is behind it. Smart deadbolts have a fat interior escutcheon housing the batteries and motor. If a storm door, a deep trim moulding or a door chain sits where that body needs to go, the lock will not sit flush.

If any of that comes back non-standard, stop and look at retrofit locks, which keep your existing deadbolt and just motorize the thumb turn on the inside.

• Thickness 1 3/8"-1 3/4", backset 2 3/8" or 2 3/4", bore 2 1/8" - the standard set.
• Renting? Retrofit or keypad lever only. Do not change a deadbolt you do not own.
• Built-in Wi-Fi beats a bridge, but costs battery life.
• BHMA Grade 1 is best, Grade 3 is the residential baseline. No grade at all is a flag.

What the specs actually mean

BHMA grade. The Builders Hardware Manufacturers Association grades locks 1 to 3 on durability, strength and finish, with Grade 1 the highest. Grade 3 is the standard residential baseline and is what most locks in this price band carry. A lock with no stated grade at all has not been through the testing, which is worth knowing.

Built-in Wi-Fi vs a bridge. Wi-Fi in the lock means you can unlock it from anywhere with no extra hardware - and it costs battery life, because a Wi-Fi radio is power-hungry. A Bluetooth lock with a separate plug-in bridge gets much longer battery life and adds a box to buy and a thing to fail. Both approaches are represented below.

Auto-lock. The feature people actually use daily. The door locks itself a set number of seconds after closing, which solves the real-world failure mode of simply forgetting.

Fingerprint. Now routine under $200 and genuinely the fastest way in with full hands. The thing to check is how many prints it stores and whether it can be re-enrolled without a factory reset.

Physical key override. Some models drop it for a cleaner look. We would not: a key cylinder is the backup for a dead battery, and the alternative backup - jumping 9V across contacts on the outside of the lock - is a worse experience in the rain.

Renting? Read this before anything else

Changing an exterior deadbolt on a property you do not own is, in most leases, a modification requiring permission - and it also breaks the landlord's key, which is both a practical and a legal problem in an emergency.

The two safe routes are a retrofit that motorizes the interior thumb turn and leaves the cylinder and keys alone, or a keypad lever on an interior door such as a home office. Both come off cleanly at the end of the tenancy.

Keep the original hardware. Every screw, the strike plate, the old thumb turn - in a labelled bag, in a drawer. Losing the original deadbolt is how a $60 upgrade becomes a deposit deduction.

Batteries, and what happens when they die

Every smart lock runs on batteries, and every smart lock will at some point be flat. The design question is what happens next.

A physical key cylinder is the best answer, and it is the reason we would not buy a keyless-only lock for a front door. A key in a wallet costs nothing and works in the rain.

A USB-C or terminal jump is the second-best answer. The Tapo DL100 takes USB-C from a power bank, which turns a dead lock into a thirty-second problem - provided you carry a power bank or can borrow one.

Neither means a locksmith, a drill and a new lock. Check before you buy, not from the doorstep.

Practical habits that help: change the batteries on a date rather than on a warning, use good alkalines rather than the ones in the box, and note that built-in Wi-Fi roughly halves battery life compared with a Bluetooth-plus-bridge lock. Our best power bank under $50 roundup covers the backup that makes a USB-C lock trivial to rescue.

Security, realistically

A smart lock changes your convenience far more than it changes your security, and it is worth being clear about why.

Most residential break-ins are not lock-picking. They are a kicked door, a smashed window or an unlocked back door. The strongest lock in this roundup is attached to a door frame and a strike plate, and a Grade 1 deadbolt in a frame with 1-inch screws into soft trim is still a weak door. Fitting 3-inch screws that reach the stud behind the frame costs a few dollars and does more for your security than the difference between any two locks on this page.

Where a smart lock genuinely helps is behavior. Auto-lock removes the single most common real-world failure - a door that was never locked at all - and temporary codes mean a key is not floating around with a contractor six months after the job.

Where it adds risk: codes get shoulder-surfed, and a worn keypad shows which four digits are in the code. Use a code length longer than four digits where the lock allows it, change codes when a trade finishes, and clean the keypad.

If you are hardening the front of the house more broadly, best doorbell camera under $100 is the other change that actually alters behavior, and best security camera under $100 covers the rest.