Smart Lock Buying Guide: What Matters for Your Front Door

Before you compare a single feature, measure three things on your door: the backset, the cross bore, and the thickness. Those numbers decide whether a lock you like will physically fit, and they're why so many installs stall halfway through with the old deadbolt in one hand and a mismatched latch in the other. Features come second.

What Should You Check on Your Door Before Buying?

Check the backset, bore holes, door thickness, and strike plate, because a smart lock that doesn't match your door prep won't install cleanly.

On a standard U.S. residential door, the large hole in the face (the cross bore) is 2-1/8 inches across, and the smaller hole in the edge is 1 inch. The backset is the distance from the door's edge to the center of the big hole, and it's almost always 2-3/8 or 2-3/4 inches. Most smart lock kits ship with an adjustable latch that handles both, so backset is rarely a dealbreaker on a standard door. Check the box anyway. Door thickness is usually 1-3/8 to 1-3/4 inches, and many locks list support up to about 2 inches, with extension kits for thicker slabs.

Then look at the strike, the plate on the frame where the bolt lands. If your current deadbolt throws smoothly without you lifting or pushing the door, you're fine. If it binds, fix the alignment first. A motorized bolt fighting a sticky strike will drain batteries and fail at the worst time.

Some doors won't take a standard smart deadbolt at all. Doors with mortise locks or multipoint locks need a model made for them, and a locksmith can tell you quickly what you have. A plain bored door is usually fine. Anything unusual usually isn't.

Which Smart Lock Features Are Worth Paying For?

Five features earn their price: auto-lock, individual access codes, a physical key or 9V backup, replaceable batteries, and a Grade 2 or better build.

Auto-lock. A forgotten lock is the most ordinary way a door ends up open, and this feature fixes exactly that. A good lock relocks after a delay you set, from about 30 seconds to a few minutes. Make sure the delay is adjustable.

Individual codes. Separate codes for family, a cleaner, or a dog walker let you delete one without disturbing the rest. Confirm you can program codes at the keypad itself, not only through an app, so a dead phone doesn't lock you out of admin duties. Scheduled codes that work only on certain days or hours are a worthwhile bonus.

Keyed or 9V fallback. Batteries die. Either the lock keeps a normal key cylinder, or it has two contacts on the bottom where you touch a 9V battery to wake it up. Either works. A lock with neither is a gamble.

Battery design. Four AA cells commonly run a Bluetooth or keypad lock for several months to a year, while built-in Wi-Fi tends to shorten that. Pick standard replaceable batteries over proprietary packs, and confirm the lock warns you well ahead of failure.

Build grade. ANSI/BHMA grades residential hardware as Grade 1 (toughest), Grade 2, or Grade 3, which is basic. For an exterior door, we'd treat Grade 2 as the floor and pay for Grade 1 on a door that gets heavy use. Some budget locks don't list a grade at all, which tells you something. A listing mark from a recognized testing lab such as UL Solutions on the lock or packaging suggests the electronics were evaluated to a safety standard.

Which Smart Lock Features Mostly Don't Matter?

Most flashy extras, including proximity auto-entry, voice-spoken PINs, and built-in cameras, add cost or risk without making the door meaningfully better.

• Phone-proximity entry. It can be inconsistent, and it opens your door based on a signal rather than a decision. A keypad is faster than most people expect.
• Voice entry. Major voice assistants typically require a spoken PIN to open a door, which defeats the convenience. Voice lock is fine and harmless.
• Fingerprint readers. Handy for kids who lose codes, but wet or cold fingers can cause misreads. Nice to have, not worth a large premium.
• Built-in cameras or doorbells. Combining a lock and a camera usually means compromising on both. Buy a dedicated video doorbell if you want one.
• 'Military grade' and similar claims. These aren't a rating. Look for the actual BHMA grade instead.
• Subscriptions. Core functions like codes and locking shouldn't require a monthly fee. Read the box for what's gated.

Do You Need a Hub for a Smart Lock?

You need a hub only if the lock uses Zigbee or Z-Wave, or if it's Bluetooth-only and you want to control it away from home.

Here's how the four connection types compare:

• Bluetooth. Works within phone range, needs no hub, and drains batteries slowly. Remote access usually requires a plug-in Wi-Fi bridge sold separately.
• Wi-Fi. Remote access with no hub, either built in or through a bridge. It costs more battery life and relies on your router.
• Zigbee or Z-Wave. Low-power mesh radios that need a compatible hub or controller. Worth it if you already run a smart home system, otherwise an extra expense.
• Thread and Matter. Newer standards aimed at working across ecosystems. Thread locks generally need a Thread border router, which some speakers and hubs already include. Check your existing gear before assuming.

Any connected lock is a networked device, so treat it like one. General advice from CISA for connected devices boils down to a few habits: change default passwords, install firmware updates, and keep your Wi-Fi network secured. CISA's site has current guidance on securing home networks and devices.

Smart Deadbolt, Keypad Lock, or Retrofit: Which Fits?

A keypad deadbolt with no radio is the better buy if you only want to stop carrying keys, and a connected smart deadbolt makes sense only if you'll actually use remote access.

A keypad deadbolt stores codes in the lock, has no app, no account, and no firmware to patch, and usually costs $60 to $150. You lose remote control and activity alerts. Most people use those less than they expect.

A retrofit smart lock is a third option. It keeps your existing exterior deadbolt and replaces only the interior thumb turn with a motorized one. That suits renters, since the original hardware stays and you can swap it back when you leave. Read your lease and ask your landlord first. Retrofits also let you keep a Grade 1 or Grade 2 deadbolt you already own, which can be sturdier than the deadbolt built into an inexpensive smart lock.

If you don't know who holds copies of your current key, get the cylinder rekeyed before you rely on a keyed fallback.

How Do the Main Smart Lock Types Compare?

Keypad deadbolts are the cheapest and simplest, Wi-Fi models add remote access without a hub, and Zigbee or Z-Wave locks need extra hardware.

What Do Smart Lock Price Tiers Buy You?

Smart locks run from about $60 to over $350, and the biggest jump in value comes between the first and second tier.

Prices shift with finish, retailer, and whether a bridge or keypad is bundled. Past about $250, you're mostly paying for looks and ecosystem support rather than a stronger door.

What We'd Buy for the Most Common Situation

For a homeowner swapping a standard deadbolt on a front door, we'd pick a Grade 2 keypad smart deadbolt in the $150 to $250 range with auto-lock, individual codes, and a physical key or 9V backup.

Choose Wi-Fi if you want remote alerts, since it works without a hub. Choose Bluetooth if you don't. Insist on replaceable AA batteries, programming from the keypad, and no subscription for core features. Skip fingerprint and proximity entry unless you have a specific reason.

If you rent, buy a retrofit lock and get written permission. If you only want to stop carrying keys, a no-radio keypad deadbolt costs roughly half as much and has less to go wrong.

Your next step: measure the backset, cross bore, and thickness tonight, write them down, and match them against the spec list on any lock before it goes in the cart.