Smart Locks Compared: What You Actually Need to Know Before Buying

What smart locks do and what they cost

A smart lock replaces or sits on top of your existing deadbolt and lets you lock or unlock your door from a phone, keypad, or key fob instead of a physical key. Most smart locks cost between $100 and $400 installed, though some run higher. The price depends on the brand, whether it needs professional installation, and whether you want extra features like video doorbells or remote access.

Smart locks work by connecting to your home's Wi-Fi or a separate hub, then communicating with your phone through an app. Some models also have a physical keypad where you can punch in a code, or a key fob you carry like a car remote. A few high-end models add fingerprint readers or facial recognition, though these are less common in residential locks.

The main trade-off is convenience versus complexity. You no longer need to carry a key, and you can let people in without being home. But you're adding a device that needs batteries, software updates, and a connection to your home network. If the lock fails or your Wi-Fi goes down, you may not be able to get in.

Key Takeaways

• Smart locks range from $100 to $400 and work by connecting to your phone, a keypad, or a key fob instead of requiring a physical key.
• Battery-powered locks last 6 to 12 months per set of batteries, and most send you a low-battery alert before they die.
• Some smart locks work with your existing deadbolt, while others replace it entirely — check your door type before buying.
• Remote access (unlocking from anywhere) requires a hub or a subscription, and adds another device and monthly cost to your setup.
• Smart locks are most useful for rental properties, frequent guests, or homes where multiple people need access at different times.

How smart locks connect and what that means for your home

Smart locks connect to your phone in one of three ways: through your home Wi-Fi, through a separate hub that talks to the lock, or through Bluetooth (which only works when you're close to the door). Wi-Fi locks are the simplest to set up but drain batteries faster. Hub-based locks are more reliable and secure but require you to buy and place an extra device. Bluetooth locks are cheap and simple but useless if you want to unlock the door from work or while you're away.

If you want remote access — the ability to unlock your door from anywhere — you need either a Wi-Fi lock or a hub. Many hub-based systems charge a monthly subscription ($5 to $15) for remote access, even though you already bought the lock. Some Wi-Fi locks include remote access for free, while others charge a subscription too. Read the fine print before you buy, because this cost adds up over time.

Your home Wi-Fi speed and signal strength matter. If your router is far from your front door or your Wi-Fi is weak, a Wi-Fi lock may not respond quickly or may drop connection. A hub-based system can work better in these cases because the hub sits closer to the lock and uses a stronger, dedicated signal.

Battery life, power loss, and what happens when things fail

Most smart locks run on four to eight AA or AAA batteries and last 6 to 12 months before you need to replace them. The lock will send you a notification when the battery is low, usually a few weeks before it dies. If the batteries do die completely, you're locked out unless you have a backup key or a physical keypad code you can enter.

Some smart locks have a backup power option — a small port where you can plug in a USB charger to unlock the door temporarily if the batteries are dead. This is useful to know about, but it only works if you have a charger nearby and can reach the port. A few premium models have wired power options, but these require an electrician and cost significantly more.

If your Wi-Fi goes down or your phone loses connection, Wi-Fi locks may not respond to your app commands. You'll still be able to use a physical keypad or key fob if the lock has one. Hub-based locks are more resilient because they don't depend on your home Wi-Fi, but if the hub loses power, remote access stops working.

Different types of smart locks and how they fit your door

Retrofit locks sit on top of your existing deadbolt and don't require you to remove or replace anything. They're cheaper ($100 to $200), easier to install yourself, and work with most standard deadbolts. The downside is they add bulk to your door and may look less polished. They also don't work if your deadbolt is damaged or if your door frame is too narrow.

Replacement locks remove your old deadbolt entirely and install a new one in its place. They look cleaner and more integrated with your door, but installation usually requires a locksmith ($50 to $150 extra) unless you're comfortable with tools. They cost more upfront ($200 to $400) but give you a more finished appearance. Replacement locks also give you more options for features like keypads or fingerprint readers built into the lock itself.

Keypad-only locks have no Wi-Fi or app at all — you just punch in a code to unlock the door. They're the cheapest option ($80 to $150), need no subscription, and work without internet. But you can't unlock the door remotely, and you can't easily change who has access without changing the code for everyone. These work well for vacation rentals or garages where you want simple, temporary access.

Comparing the major brands and their real differences

The most common brands are August, Level Lock, Yale, Schlage, and Kwikset. August locks are Wi-Fi based, work with most deadbolts as retrofits, and include free remote access. Level Lock is a retrofit that fits inside your existing deadbolt and is nearly invisible from outside, but it's more expensive and requires professional installation. Yale and Schlage are replacement locks that integrate with smart home systems like Google Home and Alexa, and they often include keypads built in.

The real difference between brands is usually in three areas: how easy they are to install, whether they work with your existing deadbolt or require replacement, and which smart home systems they talk to. If you have an Alexa setup, a Schlage lock that works with Alexa may be more convenient than an August lock that doesn't. If you rent and can't modify your door, a retrofit like August is your only option. If you want the cleanest look and don't mind paying for installation, a replacement lock like Yale is worth considering.

All major brands offer similar battery life (6 to 12 months), similar app reliability, and similar security features. The differences are mostly in aesthetics, installation method, and which other smart home devices they work with. Read reviews specific to your door type and your smart home setup before deciding.

Security, hacking, and whether smart locks are actually safer

Smart locks are not inherently less secure than traditional deadbolts. They use encryption to protect your unlock commands, and most major brands have not had widespread hacking incidents. However, they do introduce new vulnerabilities: if someone gets your phone password, they could unlock your door remotely. If your Wi-Fi is weak or unsecured, someone on your network could potentially intercept commands.

The practical security risk is usually smaller than the convenience benefit. A smart lock is more secure than hiding a key under a mat or in a planter, and it's more convenient than giving copies of your key to multiple people. If you're worried about hacking, use a strong, unique password for your lock's app, enable two-factor authentication if the brand offers it, and keep your phone and home Wi-Fi secure.

One real security advantage of smart locks is the audit trail. Most apps show you a log of who unlocked the door and when, which is useful if you rent out a property or have a cleaner or contractor coming by. Traditional locks give you no record of who came and went.

When a smart lock makes sense and when it doesn't

Smart locks are most useful if you rent out a property, have frequent guests or contractors, or live with multiple people who need access at different times. They're also helpful if you frequently lose your keys or if you want to avoid carrying a key at all. For a single person in a house they own and rarely leaves, a smart lock is a convenience feature, not a necessity.

Smart locks are less useful if you have an older or unusual door, if your Wi-Fi is unreliable, or if you prefer not to rely on batteries and apps. They're also not a substitute for good outdoor lighting, a visible security camera, or a solid door frame — those things matter more for actual security than whether your lock is smart.

If you're renting, check your lease and talk to your landlord before installing a smart lock. Some landlords allow retrofits but not replacements. Some require you to remove the lock when you move. A few landlords won't allow smart locks at all.

Installation, setup, and what to expect the first time

Retrofit locks usually take 15 to 30 minutes to install yourself with basic tools — usually just a screwdriver. You remove the interior cover of your deadbolt, attach the smart lock mechanism, and screw it back on. The app setup takes another 10 to 15 minutes: download the app, create an account, connect the lock to your Wi-Fi, and test it a few times.

Replacement locks typically require a locksmith unless you're experienced with door hardware. A locksmith visit costs $50 to $150 and takes 30 to 60 minutes. Some brands offer professional installation as part of the purchase, so check before you buy. After installation, app setup is the same: download, create an account, connect, and test.

The first time you use a smart lock, test it several times before you rely on it. Make sure the app responds quickly, the lock engages fully, and you can still unlock it with a backup method (keypad, key fob, or physical key). If something feels slow or unreliable, restart the lock and your phone, and check your Wi-Fi signal. Most issues resolve after a restart.

Frequently Asked Questions

What happens if my smart lock's battery dies?

You won't be able to unlock the door with your phone. If your lock has a physical keypad, you can still enter a code. If it has a key fob, you can use that. Some locks have a USB backup port where you can plug in a charger to unlock temporarily. If none of these options work, you'll need to call a locksmith or use a physical key if you have one.

Do I need Wi-Fi for a smart lock to work?

Not always. Keypad-only locks and key fob locks work without Wi-Fi. Bluetooth locks work without Wi-Fi as long as you're close to the door. But if you want remote access — unlocking from your phone while you're away — you need either Wi-Fi or a hub. Wi-Fi locks that lose connection can still be unlocked with a keypad or backup method.

Can I install a smart lock myself, or do I need a locksmith?

Retrofit locks are designed for DIY installation and usually take 15 to 30 minutes with basic tools. Replacement locks require removing your old deadbolt, which is more complex and often worth paying a locksmith $50 to $150 to do. Check the brand's installation guide before you buy to see if you're comfortable with the process.

Will a smart lock work with my rental apartment?

Retrofit locks usually work because they don't permanently modify your door. But check your lease and ask your landlord first — some leases forbid any lock changes, and some landlords require you to remove the lock when you move. Replacement locks almost never work in rentals because they require permanent modification.

How much does remote access cost?

Some smart locks include remote access for free. Others charge a monthly subscription of $5 to $15. A few charge a one-time fee instead. Check the brand's pricing page before you buy, because these costs add up over time and aren't always obvious in the product description.