How to Choose a Smart Lock: The Complete Buying Guide

Smart locks have more variables than most smart home devices — deadbolt type, connectivity protocol, entry methods, ecosystem compatibility, security grade, battery life, and subscription requirements. Knowing which of these actually matter for your situation simplifies the decision significantly.

This guide walks through the key decisions in the order you should make them.

Step 1: Determine your installation type

Before anything else, figure out what kind of installation your situation allows.

Can you replace your existing deadbolt?

If you own your home, or your landlord approves the change: a full replacement deadbolt gives you the widest selection and typically the most reliable performance. You remove your existing deadbolt and install the smart lock in its place.

Requirements: a standard door prep for a deadbolt (most US exterior doors have this). Check that your door has a 2-3/8" or 2-3/4" backset (the distance from the door edge to the center of the hole). Both are common; most smart lock kits include hardware for both.

Can't replace the exterior hardware?

Renters and some condo owners may need to leave the exterior hardware unchanged. In this case, an interior retrofit lock (August, Wyze) is the appropriate category — it attaches to the interior thumbturn of your existing deadbolt without changing the exterior.

→ Full guide: Best Smart Locks for Renters

Step 2: Decide on connectivity

Your connectivity choice determines how you control the lock remotely and which hub hardware (if any) you need.

Wi-Fi deadbolt

Best for: People who want remote access without additional hardware.

Connects directly to your router. Remote access (locking/unlocking from anywhere) works out of the box. No additional hub purchase. Trade-off: higher battery consumption than other protocols. Expect 3–6 months per battery set on typical Wi-Fi locks vs. 6–12 months for non-Wi-Fi models.

Matter over Thread

Best for: People who want cross-ecosystem compatibility, local reliability, and better battery life than Wi-Fi.

Works with all four major ecosystems. Thread is a low-power mesh protocol — battery life is better than Wi-Fi. Requires a Thread Border Router, but if you have an Apple TV 4K, HomePod, 4th gen Echo, or 2nd gen Nest Hub, you already have one.

→ What Is Matter?

Z-Wave

Best for: People already using a Z-Wave hub (SmartThings, Hubitat) with other devices.

Excellent range, reliable mesh, and strong security. Requires a Z-Wave hub — not the right choice if you don't have one already.

Bluetooth only

Best for: Local-only control, or integration with a bridge hub device sold by the manufacturer.

No remote access without an additional bridge. Best battery life. Only choose this if local use is sufficient or you're adding the manufacturer's bridge for remote connectivity.

Step 3: Confirm ecosystem compatibility

Check that the lock explicitly supports your ecosystem. The compatibility claim should appear on the box or the manufacturer's product page — not just in reviews.

• Alexa users: look for "Works with Alexa" badge
• Google Home users: look for "Works with Google Home" badge
• Apple Home users: look for "Works with Apple Home," "HomeKit," or the Matter certification logo

Apple Home is the most restrictive — not all smart locks support it. If you use Apple Home, verify HomeKit or Matter certification specifically.

→ Best Smart Locks for Apple Home

Step 4: Choose your entry methods

Think about who will use this lock and how:

Keypad (recommended for most)

A numeric keypad lets family members, guests, and service providers enter without a physical key or a smartphone. It's the most universally accessible entry method and works regardless of internet connectivity. Almost all full-replacement smart locks include a keypad; some retrofit models require a separate keypad purchase.

Fingerprint

Fast and hands-free. Adds cost. Less useful in cold climates where you may be wearing gloves. A secondary entry method alongside a keypad, not a replacement for it. Useful if you have household members who struggle to remember PINs.

App (Bluetooth or remote)

All smart locks include app control. Works as long as your phone is charged. The risk: if your phone battery dies, app access fails. This is why having a keypad backup matters.

Physical key

Most full-replacement deadbolts include a traditional key cylinder as a backup. Key-free models (like Yale Assure Lock key-free) eliminate the cylinder for a cleaner look, but also eliminate the physical key backup. For most homes, keeping a backup key is the more prudent choice.

Step 5: Check the security grade

ANSI/BHMA grades define deadbolt security:

• Grade 1: Highest residential/commercial security. Resists significant force, drilling, and picking.
• Grade 2: Standard residential security. Adequate for most homes.
• Grade 3: Minimum. Not recommended for exterior doors.

Most quality consumer smart locks are Grade 2. A few (including some Schlage models) achieve Grade 1. The grade should appear on the product packaging or the manufacturer's spec sheet.

Step 6: Understand battery life and replacement

Questions to answer before buying:

• What battery type? (Most: standard AA. Some: 9V or proprietary rechargeable.)
• How long does a battery set last? (Manufacturer estimates vary; check reviews for real-world reports.)
• Does the lock send low-battery alerts? (Essential — locks without this leave you guessing.)
• Is there an emergency power option? (A 9V contact on the exterior is standard on most quality locks.)

Step 7: Check subscription requirements

Confirm which features require a monthly payment and which don't. Key questions:

• Is remote locking/unlocking free?
• Is the activity log free, and for how many days?
• Are access code management and scheduling free?
• Is geofencing auto-unlock free?

The major brands (Schlage, Yale) include all core features without subscription. Other brands may restrict useful features behind a paid plan.

→ Best Smart Locks Without a Subscription

Common mistakes to avoid

Buying a lock that doesn't fit your door

Measure your backset before ordering — it's the distance from the door edge to the center of the borehole. Standard backsets are 2-3/8" (60mm) and 2-3/4" (70mm). Most smart locks accommodate both with included hardware, but verify before purchasing. Also check your door thickness — standard US doors are 1-3/8" to 1-3/4"; unusual thicknesses may require an adapter.

Assuming "smart" means all ecosystems

Many smart locks support only one or two ecosystems. "Works with Alexa" does not mean "Works with Apple Home." Check the specific compatibility badges for your platform.

Ignoring the deadbolt's physical condition

A smart lock won't fix a door that doesn't close properly or a deadbolt that sticks. The motor adds mechanical stress to an already-problematic door and will fail faster. Fix alignment issues, lubricate the bolt mechanism, and ensure the strike plate is properly positioned before installing any smart lock.

Choosing key-free without understanding the risk

Key-free models have no emergency physical key. If the battery dies and the 9V jump-start doesn't work, you're locked out. For most users, the backup key cylinder is worth keeping.

Recommended for each situation

• Simplest setup, Alexa or Google Home, homeowner → Schlage Encode (Wi-Fi, no subscription, widely available)
• Apple Home or maximum compatibility → Schlage Encode Plus or Yale Assure Lock 2 (Matter)
• Renter → August Wi-Fi Smart Lock (retrofit, landlord-friendly)
• No subscription required → Schlage Encode or Encode Plus
• Z-Wave ecosystem already in place → Yale Assure Lock SL (Z-Wave) or Schlage BE469
• Biometric fingerprint → Kwikset Halo Touch (Alexa/Google Home) or Ultraloq U-Bolt Pro

→ Full pillar: Best Smart Locks

Frequently asked questions

How hard is it to install a smart lock?

For a standard US door: 20–30 minutes with a screwdriver. No wiring, no special tools. The process involves removing 4–6 screws from your existing deadbolt, disconnecting it, positioning the new lock, and reconnecting the screws. Every major brand includes illustrated instructions, and video installation guides for every major model are available. If you can assemble flat-pack furniture, you can install a smart lock.

Can I install a smart lock on an apartment door?

Depending on what your landlord approves. A full deadbolt replacement requires landlord permission. An interior retrofit lock (August, Wyze) is less invasive and more likely to be approved. Always ask before installing.

What if I have a multi-point locking door?

Multi-point locks (common in European doors, some high-security US doors) lock at multiple points along the door frame simultaneously. Most consumer smart locks don't support multi-point mechanisms — they're designed for standard single-point deadbolts. If you have a multi-point lock, check specifically for compatible products; options are limited.

Do I need a separate smart lock if I already have a smart doorbell?

A video doorbell lets you see who's at the door — it doesn't control the door lock. They solve different problems and work well together. A doorbell shows you the visitor; a smart lock lets you let them in remotely.