Smart Locks — Guest Codes, Keyless Entry, and What Happens When the Battery Dies

What Smart Locks Actually Offer

Smart locks replace or augment your physical lock cylinder with a Wi-Fi or Z-Wave connected controller. The genuine benefits:

These are real conveniences that address real problems — particularly for property managers, vacation rentals, and people who regularly need to let service workers in.

The Security Risks Worth Understanding

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The Account Is the Attack Surface

A smart lock is only as secure as the account it's attached to. If your Yale, August, or Schlage account is compromised, whoever has your credentials has your front door.

Use a strong, unique password for your smart lock account and enable 2FA. This is more important than any feature of the lock itself.

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Bluetooth Proximity Attacks

Many smart locks unlock automatically when your phone comes within Bluetooth range. Relay attacks can extend the Bluetooth range of your phone without your knowledge — an attacker near you can relay your phone's signal to an accomplice at your front door.

For high-security installations, disable Bluetooth auto-unlock and require active confirmation.

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Offline Vulnerabilities

Smart locks typically have a physical backup — either a traditional key cylinder or a backup code. If the backup cylinder is low quality, it's easier to pick than the smart features suggest. Some models have had their backup override code accessible via a physical button on the device.

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Battery Failure

Most smart locks run on AA batteries and last 6–12 months. When the battery dies, the lock stops responding. Every smart lock should have a plan for battery failure — most offer a 9-volt emergency power contact on the exterior that can temporarily power the lock.

Set up low-battery alerts in the app. Replace batteries when the alert fires, not when the lock stops working.

Guest Access Best Practices

Guest codes are one of the most useful features of smart locks, but they need active management:

Does a Smart Lock Make Your Home More or Less Secure?

For most homes, a smart lock with a quality lock cylinder (Grade 1 ANSI rating) and properly managed access codes is no less secure than a traditional lock — and is more convenient. The physical cylinder quality matters more than the smart features.

The weak point is always the account. Secure the account and the lock is fine.

Bottom Line

Smart locks provide genuine convenience and useful access management features. The security depends almost entirely on account security and access code hygiene — not the hardware itself. Use 2FA on the account, review codes regularly, and set expiry dates on everything.

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