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Smart locks have one big fork in the road: replace your entire deadbolt, or retrofit over the existing one. That decision determines which brands even apply to your situation. After that, it's about ecosystem fit, connectivity type, and build quality. Here's what to know before buying.

Quick answer

The first decision: retrofit vs full replacement

Retrofit locks (August, Wyze Lock) mount on the interior side of your door and turn your existing deadbolt's thumb-turn. Your exterior hardware stays identical — same lock face, same keys, same looks from outside. This is the right choice for renters, for doors where you want to keep existing keys working, or when you don't want to drill new holes.

Full replacement locks (Schlage, Yale, Kwikset) replace your entire deadbolt. They look like a traditional lock from outside, with either a keypad or a touchscreen instead of a keyhole (though most still include a physical key backup). These are more secure, more weather-resistant, and have better build quality because they're designed as complete units.

What to look for

ANSI/BHMA grade rating — Grade 1 is commercial-grade and the highest residential security standard. Schlage Encode and Yale Assure Lock 2 are Grade 1. Most cheap smart locks are Grade 3. If your front door is your main entry point, don't go below Grade 1.

Connectivity type — Smart locks connect via WiFi, Z-Wave, Zigbee, or Bluetooth. WiFi locks (Schlage Encode, August 4th Gen) work without a separate hub. Z-Wave and Zigbee locks (Yale Assure Lock 2) require a hub like SmartThings, Hubitat, or an Alexa hub with Z-Wave support, but they're more reliable and don't strain your WiFi router.

Battery life — Smart locks with keypads and WiFi consume more power than you'd expect. Expect 6–12 months on a set of AA batteries under normal use. Cold weather kills batteries faster; lithium batteries significantly outperform alkaline below 40°F.

Ecosystem fit — If you're Apple-heavy, look for HomeKit support (Yale Assure Lock 2) or Apple Home Key (Schlage Encode Plus). If you're Alexa or Google Home based, most major brands work fine. Apple Home Key lets you tap your iPhone or Apple Watch directly on the lock to unlock — no app required.

Our picks

Best overall: Schlage Encode Plus

The Encode Plus is the easiest recommendation for most homeowners replacing a deadbolt. It's Grade 1 certified (same rating as commercial building locks), has WiFi built in so there's no hub, supports up to 100 access codes, and is one of the few smart locks with Apple Home Key — meaning you can tap to unlock with iPhone or Apple Watch without opening an app. Build quality is noticeably better than cheaper brands; the keypad has a solid feel and the deadbolt mechanism itself is robust.

The Encode Plus only requires 2.4GHz WiFi — make sure you have a separate 2.4GHz network available, especially if your router uses combined bands.

Best retrofit: August Wi-Fi Smart Lock (4th Gen)

The August 4th Gen is the right lock for situations where you can't or don't want to replace your deadbolt. It mounts on the interior thumb-turn using an adapter system that fits most standard deadbolts. From outside, your door looks exactly the same — same keyhole, same keys work. The August app handles access codes, auto-lock, DoorSense (detects if door is open or closed), and Alexa/Google Home integration. Setup takes about 10 minutes.

The most important thing to get right during setup: calibration must be done with the door open. If you calibrate with the door closed, the lock will report false jammed errors.

→ Fix: August Smart Lock calibration failed or jammed error

Best for smart home hubs: Yale Assure Lock 2

The Yale Assure Lock 2 stands out because it's available in multiple radio variants — WiFi, Z-Wave, and Zigbee — using the same physical lock. If you're running a SmartThings hub or Hubitat, the Z-Wave version integrates more reliably than any WiFi lock. The touchscreen is clean, it supports Apple HomeKit (on the WiFi+ version), and Yale's deadbolt mechanism is Grade 1 certified. Battery life is good, typically 12+ months with normal use.

→ Fix: Yale Assure Lock Z-Wave pairing failed

Budget pick: Schlage Encode

The original Schlage Encode (non-Plus) has the same Grade 1 deadbolt, same built-in WiFi, same keypad — just without Apple Home Key support. If you're not in the Apple ecosystem, the Encode saves money and delivers the same core experience. It has a built-in alarm sensor that detects tampering, which cheaper competitors don't include.

→ Fix: Schlage Encode WiFi not connecting

The battery issue

Every smart lock manufacturer underestimates how fast batteries drain, especially in cold climates. Standard alkaline AA batteries lose voltage quickly below freezing — a lock that works fine in summer will stop responding in January. Energizer Ultimate Lithium batteries maintain voltage down to -40°F and typically last 2–3x longer than alkaline in smart lock applications.

FAQ

Do smart locks work during a power outage? Yes — smart locks run on batteries, not your home's power. The physical keypad and mechanical backup key both work during outages. The cloud-based features (remote access, history) require your router to be online.

Can I keep my existing keys with a smart lock? Full replacement locks (Schlage, Yale) include physical key backup by default. Retrofit locks (August) keep your existing deadbolt's keys working entirely. No smart lock forces you to be completely keyless.

What happens when the battery dies? Most smart locks give low-battery warnings well in advance (typically at 20% remaining). If you somehow miss them, most locks have a physical key override. Some, like Schlage, support jump-starting with a 9V battery held against terminals on the keypad.

Are smart locks actually secure? The weakest point of a door is rarely the lock — it's usually the door frame and the strike plate. A Grade 1 smart lock on a door with a reinforced strike plate and 3-inch screws is more secure than a Grade 3 deadbolt with original hardware. The "smart" part doesn't meaningfully change the physical security.

Will smart locks work with my apartment? Most apartments don't allow replacing deadbolts. A retrofit lock like August (which mounts on the interior and leaves the exterior hardware unchanged) is usually acceptable — confirm with your landlord first.