Smart Lock vs a Regular Deadbolt

The short answer

A smart deadbolt is a deadbolt. The bolt, the strike plate and the door are doing the security; the electronics are doing the access control. So the honest comparison is not “smart versus mechanical” — it is “which graded deadbolt, and do you want keys or codes as the thing you hand out?”

That framing matters because the two products fail in completely different ways. A mechanical deadbolt fails when somebody attacks the door or the frame. A smart deadbolt fails that way too, and when the batteries die, the firmware sulks or the account is sloppy. The upside is that it also removes the failure mode nobody counts: the key under the mat, the key the contractor kept, the key you cannot get back.

What the makers actually publish about strength

There is one comparable mechanical claim in this aisle and it is the ANSI/BHMA grade the maker prints on the product page. Here is what the locks we cover publish.

Schlage lists ANSI/BHMA A156.40 Grade AAA for the Encode Plus, along with a built-in alarm, up to 100 scheduled access codes and built-in Wi-Fi with no additional accessories. Yale lists ANSI/BHMA Grade 2 for the Assure Lock 2, with unlimited shared codes and Auto-Lock with DoorSense. Wyze publishes a long feature list for the Lock Bolt — fingerprint unlock, 4-to-8-digit keypad codes, app control, an activity log, a flashing red low-battery indicator and a USB-C port for a brief emergency charge — but no ANSI/BHMA grade on its own product page. That is not an accusation; it is a gap in the information, and a gap in the information is exactly what this site exists to point at.

We report those grades and deliberately do not translate them into cycle counts, impact figures or “equivalent to a commercial door” claims. Those numbers live in the standard documents, we have not read them, and we are not going to paraphrase a standard we have not seen.

The retrofit case, which settles the argument

There is one configuration where the security question has a clean answer: the retrofit lock. August’s own page describes a lock that attaches to your existing door lock, on the inside of the door, over the deadbolt, “so you can still use your keys”.

Read what that means mechanically. The deadbolt is the one you already had. The keyway is the one you already had. The strike plate, the jamb and the screws are untouched. A motor on the inside turns the thumb-turn you used to turn with your fingers. Whatever mechanical grade your door had before, it still has — so the only thing being added is the access control, with none of the mechanical uncertainty.

That is the single strongest argument in the smart-lock-versus-deadbolt debate, and it belongs to the retrofit design. It is also why we rank the August bundle so highly for renters and for anyone with a door they like the look of. The honest price of it: no keypad unless you buy one, which is why we list it as a bundle with the Keypad Touch.

Four things a plain deadbolt is genuinely better at

1. It never needs charging. No batteries, no low-battery indicator, no six-month cycle. Schlage publishes four AA cells with up to six months of typical use on the Encode Plus and Yale publishes four AA cells on the Assure Lock 2 — perfectly reasonable, and still more maintenance than zero.

2. There is no software in it. Nothing to update, nothing to deprecate, no app redesign, no server to be retired in 2031. A mechanical lock will outlive every cloud service mentioned on this website.

3. There is no account. NIST runs an entire federal programme on IoT device security and CISA publishes consumer guidance on securing connected devices, which tells you the category has a real attack surface. A mechanical deadbolt has no credential to leak.

4. It is cheaper. Often several times cheaper. If the only thing you want is a locked door, you can have one for a fraction of the prices on this page.

Four things a smart lock is genuinely better at

1. Trust becomes revocable. A key is permanent until you change the cylinder. A code is deleted in four seconds. Schlage publishes up to 100 scheduled access codes; Yale publishes unlimited shared codes. For a cleaner, a dog walker, a contractor or a family member, that is the whole ballgame.

2. You can see what happened. Wyze publishes an activity log showing who locked or unlocked the door, when and by which method. No mechanical lock tells you anything.

3. The door locks itself. Yale publishes Auto-Lock with DoorSense — and the DoorSense half is the part that matters, because a lock that knows the door is actually shut is doing something a timer cannot. We pull that apart in do smart locks lock automatically?

4. It costs nothing to run. Unlike cameras, where the monthly fee is the business model, locks are the honest half of this aisle: smart locks do not require a subscription. Batteries are the entire running cost.

Side by side, on published facts only

The three locks this comparison points to

Three picks from our main lock ranking, chosen on the published grades and back-up arrangements in the table above rather than on testing we have not done.

The thing both sides of this argument ignore

Burglary is a real category of crime that federal statisticians track — the Bureau of Justice Statistics publishes household burglary victimisation data from the national survey — and the overwhelming majority of what makes a door hard to get through is carpentry, not electronics. The bolt goes into a strike plate, the strike plate screws into a jamb, the jamb is nailed to a stud. Long screws, a reinforced strike plate and a door that actually closes will do more for you than the difference between two good locks.

So the sequence we would follow: fix the frame, buy a graded deadbolt, and then decide whether you want keys or codes as the thing you hand to other people. If codes, the smart lock earns its place easily. If keys, buy a good mechanical lock with a clear conscience — and read are smart locks worth it? for the version of this conversation that puts a number on it. If it is a rental door you are securing, our Airbnb and rental lock ranking is the specific case where revocable codes stop being a convenience and start being the product.