Are Smart Locks Secure? The Truth You Should Know 2026

Are smart locks secure? The honest answer is yes, with caveats. Most modern smart locks use AES-128 or AES-256 encryption, the same cipher standard protecting your online banking.

The weak points aren't usually the lock itself. They're the account, the network, or the door it's attached to.

The physical lock is one layer out of several. Per ANSI/BHMA A156.36, residential deadbolts earn a Grade 1, 2, or 3 rating based on torque, impact, and cycle testing. A Grade 1 lock handles far more abuse than a no-name import with a smart chip glued on.

So the real question is where the security actually lives, and which parts of it you control.

are smart locks secure

Yes, smart locks are secure when three conditions hold. The lock is ANSI/BHMA Grade 1 or 2. The protocol is Matter, Thread, Wi-Fi with TLS 1.3, or Z-Wave with AES-128.

Your setup uses a unique password, 2FA, and 6-digit PINs. Miss any one and security drops fast.

The Short Answer: Security Depends on Three Things

Three variables decide whether your smart lock is genuinely secure: device build quality, the wireless protocol it speaks, and how you configure it. Fail any one and the whole chain weakens.

Device build quality comes down to certification. ANSI/BHMA Grade 1 rated hardware resists kick-ins, drilling, and wrench attacks far better than Grade 3. A cheap lock with excellent encryption still opens with one firm boot if the bolt snaps.

Protocol is the second variable. Bluetooth Low Energy (BLE) is short-range and encrypted but exploitable via relay attacks if the pairing is loose. Wi-Fi is convenient but exposes the lock to your whole network.

Thread with Matter is the newest standard, and it keeps local traffic encrypted and hub-mediated.

Configuration is the third piece, and it's the one most people get wrong. A $300 lock with a 4-digit PIN and no two-factor authentication is less secure than a $90 lock with a strong passphrase and 2FA enabled.

Here's how the three variables stack up in practice.

Miss on all three and you've got a lock a teenager with a $40 relay tool can defeat. Hit on all three and the lock stops nearly every realistic attacker.

The rest of this piece breaks down each variable properly. We'll look at how the locks work, where the real attack surfaces sit, how protocols compare, and what a Grade 1 rating means in the real world.

How Smart Locks Actually Work (And Where the Weak Points Sit)

A smart lock has six working parts: the motor, the bolt, the keypad or sensor, the wireless radio, the controller board, and the cloud or hub link. Every attack surface in existence targets one of those six.

The motor drives the deadbolt in and out. It's mechanical, so it's only as strong as the bolt itself. A 1-inch bolt throw is standard for residential deadbolts, and that's what keeps the door shut if someone tries to pry it open.

The keypad or sensor is your input method. Could be a PIN pad, a capacitive touchscreen, a fingerprint reader, or a Bluetooth proximity sensor that unlocks when your phone is nearby. This is where weak PINs and replay attacks land.

The wireless radio is the bridge to your phone, hub, or the cloud. BLE, Wi-Fi, Thread, Z-Wave, and Zigbee all live here. Every one has a different threat model.

The controller board holds the firmware and encryption keys. If it's compromised, the lock obeys whatever commands it receives. Firmware updates patch vulnerabilities here, which is why abandoned devices become liabilities.

The cloud or hub link is where most real-world compromises happen. Your lock talks to a manufacturer server that stores access logs, PINs, and user accounts. If that server gets breached, or if your account password leaks, someone can unlock your door from anywhere.

Where attackers actually get in

Most working attacks don't touch the encryption at all. They go after the human and the account.

• Credential stuffing. You reused your email password on the lock app. A breach elsewhere hands attackers your login.
• Weak or shared PINs. "1234" and the last four digits of your phone number show up in real breach data constantly.
• BLE relay. An attacker with two radios between you and your door extends the Bluetooth signal and tricks the lock into thinking you're standing next to it.
• Abandoned firmware. The manufacturer stopped shipping updates two years ago. Known CVEs sit unpatched on your device.
• Physical bypass. The keyway on a single-cylinder deadbolt is still a lockpick or bump-key target, no matter how smart the rest of the device is.

Research published through USENIX Security and NDSS proceedings has demonstrated BLE relay attacks against consumer smart locks in controlled lab conditions repeatedly since 2016. That doesn't mean someone is standing outside your house with a relay rig. It means the theoretical attack exists, and vendors have slowly been closing the gap.

Thread and Matter have helped. They force local encryption and cut the Bluetooth relay window down because the lock talks to a hub, not directly to a phone. As of 2026, Matter-certified locks are the cleanest protocol path available for a residential setup.

The Real Attack Surfaces, Ranked by Likelihood

Ranked by how often they cause a break-in or a lockout, here's the honest order. Notice the exotic stuff sits at the bottom.

Cloud account and app compromise

This is the number one way smart locks fail in the wild. Your lock app is a login screen. If the email and password you use there also sit in a leaked database from some other service, an attacker has a working key to your front door.

Two-factor authentication is the single best defence. Enable it. Use an authenticator app over SMS if the vendor offers it, because SIM-swap attacks defeat text-based codes.

Bluetooth and relay attacks

BLE relay requires two coordinated radios physically near you and your door at the same time. It's been demonstrated in academic settings, not in mass burglary statistics. Still, if your lock has an auto-unlock feature, you're extending the attack window every time you walk up to the door.

If you live in a high-traffic area, turn auto-unlock off. Use the app to unlock manually. It's one extra tap and it removes a whole category of attack.

Firmware bugs and abandoned devices

Every smart lock ships with firmware running on a small microcontroller. Bugs are inevitable. What matters is whether the vendor patches them and pushes updates over the air.

Check the last firmware release date before you buy. If a vendor hasn't shipped a security update in 18 months, that's a red flag. CISA publishes IoT security advisories that include smart home devices, and a quick search of the vendor name is a five-minute sanity check.

The physical keyway nobody talks about

Every single-cylinder smart deadbolt with a backup key still has a keyway. That keyway can be picked, bumped, or bypassed with a snap gun by anyone with ten minutes of practice and $60 of tools.

If you want to eliminate that surface entirely, buy a keyless model. If you want a backup key as insurance against a dead battery, understand you've traded one risk for another. There's no free lunch here.

Your door, frame, and strike plate

Here's the part almost nobody covers. A smart lock is bolted to a door that's hung in a frame with a strike plate. Most residential strike plates are attached with three 3/4-inch screws that bite into the softwood door jamb, not the stud.

A firm kick splits the jamb, and the lock doesn't matter at all. Whatever you spend on the lock, spend $15 on a reinforced strike plate and 3-inch screws. That single upgrade stops more real break-ins than any encryption upgrade ever will.

Wireless Protocols Compared: Wi-Fi vs. Bluetooth vs. Thread/Matter vs. Z-Wave/Zigbee

The protocol decides how your lock talks to the world, and each one carries a different security and reliability profile. There's no single winner. There's a right answer for your setup.

Wi-Fi: convenient but battery-hungry

Wi-Fi locks connect directly to your router. No hub needed, remote access from anywhere. The downside is battery life.

A Wi-Fi lock drains batteries in 4 to 8 weeks in continuous use, versus 6 to 12 months for Thread or Z-Wave.

From a security angle, Wi-Fi is fine if the lock uses TLS 1.2 or 1.3 and your router isn't running WPA2. Put the lock on a guest network if you can. That keeps it isolated from your laptop and NAS.

Bluetooth: simple but limited

Bluetooth-only locks are cheap, easy to install, and don't need a hub. They also can't be controlled remotely unless you add a bridge. The 30-foot range is a limitation and a feature at the same time.

Attackers need to be physically close.

The BLE relay risk is real but narrow. If you keep auto-unlock disabled and use a strong app password, Bluetooth is plenty for a rental or a single-user apartment.

Thread and Matter: the modern standard

Thread is a low-power mesh radio. Matter is the language devices speak over it. Together they give you local encryption, whole-home range, and multi-vendor compatibility, all without trashing your battery.

Matter 1.x certified locks work with Apple Home, Google Home, Amazon Alexa, and Samsung SmartThings simultaneously. No lock-in. That alone is worth the small extra cost.

As of 2026, most premium locks ship with Matter support out of the box.

If you want to kit out a rental or apartment, it's worth seeing how these devices fit alongside the other top-rated gadgets for renters before you commit to an ecosystem.

Z-Wave and Zigbee: the older generation

Both are mature, encrypted (AES-128), and mesh-based. If you already run a SmartThings or Hubitat hub, they're a solid choice. They don't do Matter yet, so you're outside the newer interoperability story.

Fine for a static setup, less ideal for a new build.

Smart Lock Security Ratings and Certifications That Actually Mean Something

Certifications are boring until you realize they're the only independent check on marketing claims. Here are the ones worth paying attention to.

ANSI/BHMA grades explained

ANSI/BHMA A156.36 is the American National Standards Institute and Builders Hardware Manufacturers Association standard for residential deadbolts and auxiliary locks. Locks are tested on three axes: torque resistance, impact resistance, and cycle life.

• Grade 1: 250,000 cycles, highest impact tolerance. Commercial-adjacent quality.
• Grade 2: 150,000 cycles, mid-range residential.
• Grade 3: 100,000 cycles, builder-grade minimum.

If a smart lock doesn't publish its grade, assume Grade 3. That's the floor, not a badge of honour.

UL 1568 and FCC Part 15

UL 1568 covers residential door hardware safety. FCC Part 15 covers the radio emissions and ensures the lock doesn't interfere with other devices. Both are baseline compliance, not differentiators.

What Matter certification does (and doesn't) guarantee

Matter certification means the device passed Connectivity Standards Alliance interoperability tests. It talks to other Matter devices correctly and uses the required encryption stack.

It does not guarantee the vendor will keep shipping firmware updates. It does not guarantee the cloud backend is secure. It does not guarantee the physical lock is Grade 1.

Matter is a communication standard, not a security audit of the whole product.

Read the certification as one green flag among several. Pair it with ANSI/BHMA grading, a public firmware update history, and a vendor that supports 2FA. Together, those four signals tell you far more than any single badge.

Smart Locks vs. Traditional Deadbolts: Where Each One Wins

Neither option wins across the board. Traditional deadbolts beat smart locks on price, longevity, and attack surface. Smart locks beat them on access control, audit trails, and daily convenience.

Traditional deadbolts have no firmware, no app, no cloud account, and no battery. The only attack surfaces are the keyway and the door itself. That simplicity is a security feature, not a lack of one.

Smart locks add a digital layer on top of the physical layer. That layer has to be defended constantly: updates, passwords, 2FA, and account hygiene. Skip the maintenance and you've made your home less secure, not more.

When a traditional deadbolt is the better call

If you rent a room, travel for months at a time, or share a home with people who won't remember to update firmware, keep the deadbolt. Upgrade it to ANSI/BHMA Grade 1 and add a reinforced strike plate. That's a $50 job that stops more break-ins than any smart device.

If your home has unreliable Wi-Fi, the smart lock becomes a liability. It will still function as a local keypad, but remote access dies. So do firmware updates.

So does the audit log.

When a smart lock earns its place

Frequent guests, cleaners, dog walkers, contractors, and short-term rental turnovers. Anywhere you'd otherwise hand out a physical key and hope you get it back, a smart lock wins outright.

Remote workers who want to check "did I lock the door?" from a hotel room. Families with aging parents who need a code that works for the caregiver on Tuesdays. Anyone who has ever lost a key and paid $200 to rekey.

The audit trail alone justifies the cost for a lot of people.

The honest take: if your life doesn't involve temporary access, a Grade 1 deadbolt plus good door hardware gives you the same real-world security for a fraction of the price and zero ongoing maintenance.

The Real Weak Point: Why Your Door Matters More Than the Lock

A $300 smart lock on a weak door is less secure than a $30 deadbolt on a solid one. That's not a marketing line. It's how burglars actually break in.

The average residential rear door has a 1-3/8-inch thick slab of composite or softwood. The door jamb is often just as flimsy. The strike plate is secured with three 3/4-inch screws that bite into softwood, not the framing stud behind it.

A single firm kick splits the jamb and pops the door open. The lock never enters the equation. Peer-reviewed burglary studies have consistently found that forced entry through the door, not defeat of the lock, accounts for the majority of residential break-ins.

What actually stops a kick-in

Four cheap upgrades make more difference than any smart feature.

• Reinforced strike plate. A 4-inch steel plate with 3-inch screws that reach the framing stud. Roughly $10 to $20.
• Door jamb reinforcement. A metal wrap or kick plate that runs the full height of the jamb. $30 to $60.
• Solid-core or metal door. Fiberglass or steel exterior doors resist flexing far better than hollow-core composites.
• Deadbolt throw depth. 1-inch minimum, 1-1/4-inch preferred for added bite.

The back door problem

Most homes have a smart lock on the front door and a 20-year-old builder-grade deadbolt on the back. Burglars know this. They walk around.

If you upgrade one entry, upgrade the other to the same standard. A front-door-only smart lock is security theatre.

Windows and glass panels

Every lock in the world is bypassed by a rock through a window. If your door has a glass panel within reach of the lock, a burglar can break the glass and reach inside to turn the thumb-turn.

Double-cylinder deadbolts (keyed on both sides) fix this. They also create a fire-safety hazard, since you need a key to escape. Most jurisdictions restrict them on egress doors.

Check local building code before installing one.

Sliding doors and garage doors

Sliding doors use a latch, not a deadbolt. Latches are trivially lifted from the outside. A dowel in the track helps, but a proper auxiliary lock is better.

Garage doors are often the softest entry point in the whole house.

Whatever you spend on the smart lock, spend the same amount again on the door. It's the part attackers actually attack.

Who Smart Locks Are Right For (And Who Should Skip Them)

Smart locks are right for anyone who manages temporary or multiple access. They're wrong for anyone who wants zero ongoing maintenance and maximum simplicity.

If/then logic makes this easier than a pros-and-cons list.

• If you run a short-term rental or host regularly, then a smart lock is worth every penny.
• If you have a cleaner, dog walker, or contractor visiting weekly, then a smart lock saves you from hiding keys under mats.
• If you travel often and want remote status checks, then a smart lock earns its cost.
• If you have mobility issues or no ability to manage keys, then keypad entry changes your daily life.
• If you live alone, keep regular hours, and never hand out keys, then a Grade 1 deadbolt does the job for less.
• If your Wi-Fi is unreliable or you refuse to manage software updates, then skip the smart lock.
• If you're in a rental where you can't install anything permanent, then a retrofit smart lock over the existing deadbolt is the only sane option.

Best for homeowners

Homeowners with permanent setups get the most out of smart locks. You can install a full replacement, add a reinforced strike plate, wire up a hub, and treat it as a long-term investment. Matter-certified models give you the longest useful life and the widest ecosystem compatibility.

Best for renters

Renters need reversible installs. Retrofit smart locks like the August Wi-Fi or SwitchBot Lock mount over the existing deadbolt without replacing it. You keep your security deposit and the landlord's hardware stays intact.

The trade-off is often weaker motors and a still-exposed keyway.

If you're kitting out a rental, it's worth looking at how these devices sit alongside other top-rated gadgets for renters before you buy into an ecosystem.

Best for short-term rental hosts

Airbnb and VRBO hosts are the smart lock's killer app. Every guest gets a unique code, valid only for their stay. No key handoff, no lost keys, no lockout calls at 2am.

Auto-expiring codes plus the audit log also cover you if a guest claims they never checked in. This is where a $200 lock pays for itself in a single season.

Best for multi-property landlords

Landlords managing five or more units need centralised control. The right setup is a Matter or Z-Wave ecosystem with per-door audit logs, remote lock/unlock, and bulk firmware management. Individual app-managed locks become a nightmare at scale.

Central management through SmartThings, Hubitat, or a commercial platform is the standard approach.

Who should skip them entirely

If you live in a building where the front door is the primary security boundary and your unit door is hollow-core, the smart lock upgrade is cosmetic. Spend the money on a Grade 1 deadbolt and a reinforced strike plate first. Add the smart features only after the physical side is handled.

Mistakes That Quietly Undo Smart Lock Security

Small oversights wreck strong hardware. Here's what our research into breach reports, user complaints, and vendor CVEs shows as the most common self-inflicted failures.

Reusing your email password on the lock app

This is the single biggest real-world compromise vector. Breach dumps from unrelated services get tried against lock apps in automated credential stuffing attacks. If you've used the same password anywhere else, change it today.

Generate a unique 16-character password in a password manager.

Skipping two-factor authentication

2FA is available on almost every major lock app in 2026. Turn it on. Use an authenticator app (Google Authenticator, Authy, 1Password, Apple Passwords) rather than SMS, which is defeatable by SIM-swap attacks.

Sharing one PIN across the household

Every person who uses the lock should have their own code. Shared codes destroy the audit trail and can't be revoked individually. If your partner's ex still has the code from two years ago, you have no way to know they used it.

Using predictable PINs

"1234," "0000," the last four digits of your phone number, your house number, and your birth year. These show up in every guessed-PIN analysis. Use random 6-digit codes and let the app generate them.

Leaving auto-unlock on in dense areas

Auto-unlock uses Bluetooth proximity or geofencing to open the door as you approach. It's convenient. It's also the feature that most BLE relay demonstrations exploit.

In an apartment building or high-traffic street, turn it off and unlock via the app.

Ignoring firmware updates

Every lock shows a firmware version somewhere in the app. If it's more than six months old and the vendor has newer firmware available, install it. Bugs get patched.

CVEs get closed. Skipping updates leaves known holes open.

Forgetting to revoke old access

When a relationship changes (roommate moves out, cleaner is let go, contractor finishes), delete every PIN, disable every saved user, and if the vendor supports it, rotate the lock's encryption keys. You'd be surprised how many people leave an old code active for years.

Using the manufacturer's default master code

Some locks ship with a factory default admin PIN, often printed on the inside of the battery cover. If you don't change it during setup, anyone with the same model knows your master code. This is a documented weakness in older keypad locks.

Always set a custom admin code on day one.

Mounting over hollow-core doors

If your door is a hollow-core interior slab, a smart lock won't save it. Even a well-installed deadbolt just pulls through the skin. Solid-core, metal, or exterior-rated doors only for any entry lock upgrade.

Not testing emergency entry

You have a backup key, or a 9V battery terminal, or a neighbour's phone registered. Have you tested any of them? Most people don't, then discover the fallback doesn't work when they're locked out at midnight in the rain.

Run an emergency entry drill once a quarter.

Setup and Maintenance Habits That Keep a Smart Lock Secure

A smart lock is only as secure as the routine you build around it. Setup takes an hour. Maintenance takes five minutes a month.

Skip either and the device quietly drifts into a weakened state.

The first-hour setup checklist

Do these in order. The sequence matters.

1. Update firmware before you pair anything. Some locks ship with outdated firmware. Connecting to the app first can leave a window where the old code is running.
2. Set a custom admin code. Never keep the factory default printed inside the battery cover. Use a 6+ digit random code and store it only in your password manager.
3. Create a unique master account. Use an email address dedicated to smart home devices. Do not reuse your personal email.
4. Enable two-factor authentication. Prefer an authenticator app over SMS.
5. Disable auto-unlock if you live in a dense area or if the lock is on an exterior door near the street.
6. Set auto-lock. 30 seconds to 2 minutes is the sweet spot. Long enough to carry in groceries. Short enough that a door left open by accident locks on its own.
7. Set failed-attempt lockout. Three to five wrong PINs should trigger a 60-second cooldown or a notification.
8. Enable tamper and forced-entry alerts. These trigger if the lock detects abnormal force or physical tampering.
9. Register a backup entry method. Either a physical key (if your model has a keyway) or a neighbour's phone paired to the lock.
10. Test the emergency drill. Lock out, unlock in, and confirm every backup path works.

The monthly five-minute routine

Once a month, open the app and check four things.

• Battery level. Below 30% means replace soon. Don't wait for the low-battery chirp.
• Audit log anomalies. Look for unlocks at times you don't recognize or codes you don't remember creating.
• Firmware version. Compare against the vendor's support page. Install any updates.
• Active users and codes. Delete anyone who no longer needs access.

The quarterly deeper check

Once every three months, go further.

• Physically inspect the strike plate and screws. Look for loosening or wobble.
• Check the deadbolt action. It should throw smoothly with no grinding. Grinding signals the motor is straining or the bolt is misaligned.
• Re-test the emergency backup. A key that worked three months ago may not work if the cylinder has seized.
• Review connected integrations. If you've linked the lock to IFTTT, Alexa, or a smart home hub, check that the integrations are still authorised and haven't been abandoned by the third party.

Wi-Fi network hygiene

If your lock is Wi-Fi connected, put it on a dedicated SSID or guest network. That isolates it from your laptops, phones, and NAS. If the lock is compromised, the attacker has nothing else to pivot to.

Use WPA3 if your router supports it. WPA2-AES is acceptable. WEP and WPA-TKIP are obsolete and should never protect a smart lock.

When to replace the lock

Replace the lock if any of the following are true.

• The vendor has not shipped a firmware update in 18 months.
• The manufacturer has discontinued the app or shut down the cloud backend.
• The lock has failed twice in the same month.
• A CVE has been published against the model and no patch is available.

An abandoned smart lock is a deadbolt with extra failure modes. When the software stops being maintained, the hardware becomes the security ceiling again.

What Happens When Things Fail: Batteries, Outages, Lockouts, and Emergency Access

Everything that can fail will fail eventually. The question is whether failure leaves you locked out or just inconvenienced. Good smart lock setups are designed around failure, not despite it.

Battery failure

Batteries die at the worst times. Cold snaps cut lithium capacity by 30% to 50%. A lock that read 40% in October reads 15% in January.

Mitigations that actually work:

• Swap batteries on a schedule. Every 6 to 9 months regardless of the meter reading.
• Use lithium AA or CR123 cells. Alkaline cells leak and die faster in cold weather.
• Keep an external power option if your lock supports one. A 9V terminal or USB-C backup port powers the lock for one unlock.
• Watch the app alert threshold. Set low-battery warnings at 30%, not 10%.

If your lock has a keyway, keep a physical backup key somewhere accessible but not on your person. Not under the mat. A lockbox with a combination, a trusted neighbour, or a car with a hide-a-key.

If your lock is keyless and the battery dies completely, you have exactly one path in: the external power terminal (if there is one) or a call to a locksmith. That's the trade-off for eliminating the keyway.

Wi-Fi and hub outages

Wi-Fi outages kill remote access. The lock still works locally via keypad, PIN, and (if applicable) Bluetooth. But the app can't reach it, auto-lock rules still work, and the audit log buffers until the connection returns.

Hub outages are worse for Z-Wave and Zigbee locks. If the hub is down, the lock might not respond to remote commands and its automations stall. Thread locks are more resilient because the border router can be any one of several devices.

If your home has frequent outages, prefer a Thread/Matter lock over Z-Wave. Or run a battery backup on your router and hub.

Load-shedding and regional power issues

In regions with rolling blackouts (parts of South Africa, California in fire season, Texas in winter storms), smart locks get tested hard. Battery life collapses. Wi-Fi modems die.

Hub devices reboot unpredictably.

The right prep: an uninterruptible power supply (UPS) on the router and hub. A spare set of lithium batteries for the lock. And a physical key or hidden keypad device on the door that works off a coin cell.

The total lockout scenario

Total lockout happens when the battery is dead, the Wi-Fi is down, there's no keyway, and the app can't reach the lock. Rare, but it happens. Every smart lock owner should have an answer to: "Who do I call, and how do they get in?"

Options ranked by cost.

• A locksmith with smart lock experience. $150 to $400 depending on region.
• A physical key if the lock has a keyway. Free if you planned ahead.
• A hidden mechanical keypad lock or key lockbox. $30 to $80 one-time.
• A neighbour with a paired phone. Free, requires trust and setup.

When the app is down

Sometimes the outage is on the vendor's side, not yours. Cloud services go down. If the vendor shuts down entirely (as has happened to several smaller smart lock brands), the app stops working permanently.

Check before you buy: does the lock function locally without the cloud? A Matter-certified lock with Thread works over your local hub even if the vendor's server is offline. A cloud-only Wi-Fi lock is dead when the vendor's backend is dead.

If a small brand shuts down, the lock often still works via keypad and local Bluetooth. Remote access dies. Plan for that possibility when choosing a vendor.

Emergency egress rules

Fire codes and building codes restrict what you can install on egress doors. Never install a lock that requires a key or code to exit from the inside if that door is a designated escape route. Single-motion egress (turn a knob, push a bar, or use the thumb-turn) is required in most jurisdictions.

Smart locks with thumb-turns satisfy this. Double-cylinder deadbolts often don't. Any lock with an in-app-only exit requirement is dangerous and illegal on egress doors in most regions.

If you're unsure about your local rule, check with your building inspector before installing.

Legal, Rental, and Insurance Considerations

Smart locks sit at the intersection of property law, tenancy contracts, and insurance policies. Getting this wrong can cost you coverage or a legal dispute.

Landlord and tenant rules

Most residential leases require written landlord approval before you change the locking hardware. Even if you plan to keep the original deadbolt and use a retrofit lock, get it in writing.

If you're a tenant, the safest path is a reversible retrofit that doesn't alter the door or the existing deadbolt. You keep your deposit and avoid stepping on the landlord's rights.

If you're a landlord, granting smart lock access to a tenant usually means agreeing to manage their PIN and audit log. That's a privacy obligation. Check state and local tenancy laws.

Some jurisdictions require 24 hours' notice before entry. Remote unlock logs create a record both sides can use in a dispute, so treat it seriously.

Short-term rental compliance

Airbnb, VRBO, and local regulators have varying rules about guest access. Some cities require a physical key as a backup. Some require a 24/7 phone line for lockouts.

Some fire codes prohibit smart locks on unit entry doors without a mechanical override.

Check the platform's host requirements and your local short-term rental ordinance. Two flat rules cut across most jurisdictions: guests must always be able to exit freely, and you must have a documented process for guest lockouts.

Insurance policy language

Homeowners insurance rarely has a specific "smart lock" clause. But it does have clauses about forced entry, security obligations, and disclosure of material changes to the property.

Two scenarios to know about.

1. If you install a smart lock and the insurer isn't told, and a break-in occurs, the insurer might argue you didn't disclose a material change. Read your policy.
2. If you install a smart lock and remove the physical keyway, and you get locked out and cause damage breaking in, that's on you, not the insurer.

Most insurers don't care about smart locks as long as you keep a UL 1568 listed lock on the door. A quick call to your agent before install removes all doubt.

GDPR, CCPA, and access logs

Smart lock apps collect timestamps, device IDs, geolocation data (for auto-unlock), and sometimes user contact details. If you're in the EU or California, the vendor is legally required to tell you this and to delete it on request.

If you host short-term guests, you're effectively the data controller for their access logs. Under GDPR, guests can request their data. Have a plan for how to handle that.

Most platforms have a "data subject request" process, but you should understand it before a guest asks.

Fire and egress codes

Fire codes in most jurisdictions require that all required exit doors open with a single motion and without a key, tool, or special knowledge. Smart locks with thumb-turn exits comply. Any lock that requires a code or an app to exit is non-compliant and dangerous.

This is non-negotiable. If a lock only opens with a code on both sides, it belongs on an interior door, not a unit entry or egress door.

Rental laws to check

Rules vary widely. As of 2026, notable ones.

• New York City: multiple dwelling law restricts certain locks on unit doors.
• UK: BS 3621 and TS 007 Kitemark requirements are often referenced in tenancy agreements and insurance policies.
• Germany: strict tenant privacy rules around lock data collection.
• Australia: varies by state, with fire safety and egress rules sometimes overriding tenancy preferences.

When in doubt, check with a local locksmith who handles rental properties. They know the inspection quirks in your area far better than a national chain.

Frequently Asked Questions

Are smart locks easier to break into than regular locks?

No, provided the lock is properly configured and the door is solid. A well-installed ANSI/BHMA Grade 1 smart lock on a reinforced door is harder to defeat than a builder-grade deadbolt. The vulnerability usually isn't the lock.

It's a reused password, a weak PIN, or a hollow-core door that gives way before the lock does.

Can someone hack my smart lock from outside my house?

Only with physical proximity and specific conditions. Bluetooth relay attacks need an attacker within radio range of your phone and door. Cloud account compromises work from anywhere, but they require your login credentials.

Use a unique password, enable 2FA, and turn off auto-unlock if you live in a dense area. Those three steps close the realistic remote attack paths.

What happens if my smart lock battery dies while I'm out?

If the lock has a keyway, your backup key gets you in. If it's keyless, most models have a 9V or USB-C emergency terminal you can power from outside for one unlock. Some locks also have a hidden mechanical override.

Never rely on a single entry method. Test your backup quarterly.

Do smart locks work during a power outage?

Yes, most do. The lock runs on batteries, not mains power. Keypad entry and Bluetooth still work.

Wi-Fi and cloud features may drop if your router is affected. Thread/Matter locks with a battery-backed hub keep working locally. Z-Wave and Zigbee locks depend on the hub staying alive.

Is it safe to use a smart lock on a rental property?

Only with written landlord approval and only if the install is reversible. Retrofit locks that mount over the existing deadbolt are the safest choice for tenants. Never replace the landlord's hardware without permission, and never install anything that prevents single-motion exit if the door is an egress route.

Should I buy a smart lock with a keyway or a keyless model?

It depends on your failure tolerance. A keyway gives you a guaranteed physical backup, which is valuable if batteries die or the app fails. A keyless model eliminates the picking and bumping attack surface entirely.

For most homes, a keyway model with a shielded cylinder is the practical middle ground. For anyone who wants zero physical attack surface and accepts the battery dependency, keyless is the cleaner choice.

How often should I update smart lock firmware?

Every time the vendor ships a security update, and at minimum every six months. Set a calendar reminder to check the vendor's support page. Firmware updates close known vulnerabilities, fix connectivity bugs, and sometimes add new Matter features.

A lock that hasn't been updated in over a year is a liability.

Do I need a hub to make a smart lock secure?

No. Hub or no hub, the security comes down to encryption, credentials, and physical build quality. A Bluetooth-only lock with a strong PIN and no cloud dependency is arguably more private than a Wi-Fi lock with a mandatory app account.

Hubs do add features like local automation and remote access without exposing the lock directly to your router.

The Honest Verdict: When a Smart Lock Is Secure Enough, And When It Isn't

There's no universal answer, and anyone who tells you otherwise is selling something. Smart locks are secure enough when three conditions hold at the same time. Weaken any one and you've built security theatre.

The three-condition test

A smart lock is genuinely secure if all of these are true.

• The lock is ANSI/BHMA Grade 1 or Grade 2, and UL 1568 listed. Anything below that is a decorative bolt with electronics attached.
• The protocol is Matter/Thread, Wi-Fi with TLS 1.3, or Z-Wave/Zigbee with AES-128. Legacy Bluetooth-only locks without modern pairing protections fall short.
• Your configuration includes a unique app password, 2FA, 6+ digit PINs, disabled auto-unlock in dense areas, and active firmware updates.

Hit all three and your smart lock will stop every realistic threat short of a determined, targeted attacker with physical access and time. Miss any one and you've handed an advantage to someone who shouldn't have one.

When a smart lock isn't secure enough

There are three scenarios where a smart lock fails the honest test, regardless of how much you spent.

Scenario one: hollow-core or weak-framed door. The lock is irrelevant if the door gives way with one kick. Fix the door first. Then buy the lock.

Scenario two: unreliable maintenance. If you or someone in the household won't update firmware, revoke old codes, or check the audit log, the smart lock degrades over time. A traditional Grade 1 deadbolt with no digital layer is arguably safer in your hands.

Scenario three: unsupported vendor. If the manufacturer has stopped shipping firmware or the app no longer works, the lock is a liability. Replace it. A dead bolt with no updates is worse than a new bolt with a plan.

What to do this week

If you're deciding whether to buy, install, or replace a smart lock, here's the sequence that matches real-world risk.

1. Fix the door first. Reinforced strike plate with 3-inch screws. Solid-core or metal entry doors. Check the back door. This is a $50 to $150 job and beats every digital upgrade.
2. Choose a Matter-certified lock from a vendor with a published firmware history. As of 2026, the Connectivity Standards Alliance's Matter 1.x program is the best signal that the device will speak to your ecosystem and receive updates.
3. Set it up with a unique password, 2FA, and 6-digit random PINs. Do this on day one, not "later."
4. Put it on a dedicated Wi-Fi SSID or use Thread. Keep the lock off your primary network.
5. Run a quarterly maintenance pass. Battery, firmware, users, emergency drill.
6. Add a reinforced strike plate and 3-inch screws to every exterior door. This is the highest-return $20 you'll ever spend on home security.

The fairness point

Smart locks are not less secure than traditional locks. They're differently secure. They trade a known, physical attack surface for a digital one that requires ongoing maintenance to defend.

If you do the maintenance, they're strictly better than a standard deadbolt. If you don't, they're worse.

That's the real trade. Not "smart vs. dumb." It's "maintained vs. neglected."

The last thing you should know

No lock, smart or otherwise, stops a determined attacker who has time, tools, and privacy. What a good lock does is buy time. It forces noise.

It makes the attempt visible and risky. Combined with a reinforced door, motion-sensing lights, and a camera covering the entry, a well-configured smart lock is part of a layered defence that works.

If your door, frame, and strike plate are solid, your app account is locked down, and your firmware is current, then yes. Your smart lock is secure enough for the way real burglars actually operate. Everything above that is margin, and margin is what good security looks like.

If you're building out the rest of the system, it's worth seeing how these locks sit alongside other home security devices worth owning before you commit to an ecosystem that locks you into one brand for the next five years.