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Smart Lock Buying Guide: What to Know Before You Buy | Revimote
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Smart Lock Buying Guide: What to Know Before You Buy
A practical guide to smart locks—what they actually do, security considerations, installation realities, and how to choose one that fits your door and lifestyle.
Renters wondering if smart locks are allowed and practical for apartments
People frustrated with managing physical keys for family, guests, or service workers
1. Who This Guide Is For
This guide is for anyone considering a smart lock who wants to understand the real trade-offs before purchasing. You might be a homeowner tired of hiding spare keys, a renter wondering if you can even install one, or someone who's seen the convenience features advertised but isn't sure about security implications.
We assume you understand basic smart home concepts but have no specific knowledge of locks. This guide covers what manufacturers don't emphasize: door compatibility issues, the keypad vs. keyless debate, battery realities, and honest security considerations.
Smart Locks vs. Traditional Locks
A smart lock replaces or augments your deadbolt with electronic access control. You can unlock via app, keypad, fingerprint, or voice command—but most smart locks can still use a physical key as backup. The "smart" part is access management, not necessarily improved physical security.
2. What Smart Locks Actually Do (And Don't Do)
Before diving into features, let's be clear about what smart locks can and can't accomplish.
What They Do Well
Keyless convenience: No fumbling for keys. Enter with a code, fingerprint, phone, or voice command.
Guest access management: Create temporary codes for houseguests, Airbnb guests, dog walkers, or contractors. Revoke access instantly without changing locks.
Remote access: Lock or unlock from anywhere via app. Let in a delivery person or check if you remembered to lock up.
Activity logs: See who unlocked the door and when. Know when kids get home from school.
Key Takeaways
Smart locks are convenience devices for access management, not physical security upgrades
Retrofit locks are easier to install and renter-friendly; full replacement offers more features like keypads
Anyone confused by the different types of smart locks and connectivity options
Current smart lock owners considering an upgrade or second lock
Auto-lock: Automatically lock after a set time so you never leave the door unlocked accidentally.
Smart home integration: Trigger automations when you unlock—turn on lights, disarm alarm, adjust thermostat.
What They Don't Do Well
Improve physical security: Most smart locks don't make your door harder to kick in. The deadbolt mechanism is similar to traditional locks. Security comes from the door, frame, and strike plate—not the lock brand.
Eliminate all keys: Most smart locks retain a key cylinder as backup. Fully keyless models exist but create risk if electronics fail.
Work without power: Batteries die. Most locks warn you in advance, but a dead battery means key-only access (or lockout on keyless models).
Guarantee remote access: WiFi locks need internet. Bluetooth locks need you nearby. Z-Wave/Zigbee locks need a hub. Each has failure points.
Prevent all break-ins: Most burglars don't pick locks—they kick doors or break windows. A smart lock doesn't address those vulnerabilities.
Security Reality Check
Smart locks are primarily convenience devices, not security upgrades. If physical security is your main concern, invest in a reinforced door frame, longer strike plate screws, and a door bar before spending on a smart lock.
3. Types of Smart Locks
Smart locks come in several form factors, each with different trade-offs.
Full Deadbolt Replacement
Replaces your entire deadbolt—both interior and exterior hardware.
Pros:
Clean, integrated appearance
Usually includes keypad or touchscreen on exterior
If you're buying new, consider Matter-compatible locks. They work with all major ecosystems and won't lock you into one platform. The selection is growing rapidly.
5. Access Methods: How You'll Actually Unlock
Smart locks offer multiple ways to unlock. Consider which methods your household will actually use.
Keypad / Touchscreen
Enter a numeric code to unlock.
Best for: Families with kids, frequent guests, Airbnb hosts
Considerations: Codes can be shared or guessed. Look for "scramble" features that randomize number positions to prevent wear patterns.
Fingerprint
Biometric unlock via fingerprint sensor.
Best for: Fastest unlock experience, households where everyone has registered fingerprints
Considerations: Wet or dirty fingers may not read. Cold weather affects some sensors. Can't share access without registering prints.
Smartphone App
Unlock via manufacturer app on your phone.
Best for: Remote access, activity logs, managing guest codes
Considerations: Requires phone to be charged and nearby (Bluetooth) or connected to internet (WiFi). Can be slow to connect.
Auto-Unlock (Proximity)
Automatically unlocks when your phone approaches the door.
Best for: Hands-free entry, carrying groceries, accessibility needs
Considerations: Can be unreliable—sometimes unlocks too early or not at all. Security concern if phone is stolen. Uses more battery.
Voice Control
Unlock via Alexa, Google Assistant, or Siri.
Best for: Convenience when hands are full, letting guests in remotely
Considerations: Many locks require a PIN spoken aloud for security—awkward and potentially overheard. Some only allow locking, not unlocking, by voice.
Physical Key
Traditional key backup built into most smart locks.
Best for: Emergency backup, battery failure, electronic malfunction
Considerations: Having a key backup means the lock can be picked. Some models are fully keyless—consider the lockout risk.
6. Door Compatibility (Check This First)
Not every smart lock fits every door. Check compatibility before purchasing.
Door Thickness
Most smart locks fit standard doors (1 3/8" to 1 3/4" thick). Thick doors may need extension kits. Thin doors may not work at all.
Backset
The distance from the door edge to the center of the lock hole. Standard backsets are 2 3/8" or 2 3/4". Measure yours—most smart locks include both sizes.
Bore Hole Size
Standard deadbolt bore is 2 1/8" diameter. If your door has a non-standard hole, full replacement locks may not fit without modifications.
Door Handedness
Most smart locks are reversible and work on left- or right-handed doors. Some lever locks are handed—check before ordering.
Existing Deadbolt Type (for Retrofit)
Retrofit locks attach to existing deadbolts but aren't universally compatible. Check the smart lock's compatibility list for your deadbolt brand and model.
Door Material and Condition
Smart locks add weight. Old, warped, or misaligned doors may have issues with auto-lock features or motor strain. Fix door alignment before installing a smart lock.
Measure Before You Buy
Use the manufacturer's compatibility checker (most brands have one online). Measure your door thickness, backset, and bore hole. Taking 5 minutes to verify compatibility prevents frustrating returns.
7. Security Considerations
Smart locks introduce both conveniences and new security considerations.
Physical Security
ANSI/BHMA grades: Look for Grade 1 (commercial) or Grade 2 (residential) ratings. Grade 3 is light-duty and not recommended for exterior doors.
Lock bumping and picking: Smart locks with key cylinders can be picked like any other lock. Keyless models eliminate this but create battery dependence.
Deadbolt strength: The smart features don't change deadbolt physics. A 1" throw is standard; some premium locks offer longer throws.
Digital Security
Encryption: Reputable brands use AES-128 or AES-256 encryption. Avoid no-name brands with unknown security practices.
Cloud account security: Your lock is only as secure as your account. Use strong, unique passwords and enable two-factor authentication.
Local vs. cloud operation: Z-Wave, Zigbee, and Thread locks can operate locally without internet. WiFi locks often depend on cloud servers—if the company has an outage, you might lose remote access.
Operational Security
Code management: Change codes when relationships end or service workers change. Use temporary codes for one-time access.
Auto-unlock risks: Proximity unlock can trigger in shared spaces (apartments) or if your phone is stolen while you're nearby.
Tamper alerts: Some locks detect and alert on tampering attempts. Useful but not a replacement for other security measures.
8. Battery Life and Power
Battery life varies dramatically based on lock type, connectivity, and usage.
Thread/Matter locks: 6-12 months (similar to Zigbee)
Battery Types
AA batteries: Most common, easy to replace, available everywhere
CR123 batteries: Smaller, longer-lasting, more expensive, harder to find
Rechargeable battery packs: Some locks (Level Lock+, some August models) have rechargeable batteries—remove and charge via USB
Low Battery Warnings
All reputable smart locks warn you before batteries die—usually via app notification and sometimes with audible alerts when unlocking. Take these warnings seriously; a dead battery means key-only access or potential lockout.
Emergency Power Options
Some locks have external power contacts that let you temporarily power the lock with a 9V battery held to the exterior. Not all models have this—check if it matters to you.
9. Installation Considerations
DIY Installation
Most smart locks are designed for DIY installation:
Retrofit locks: 10-20 minutes, often no tools needed
Full replacement: 20-45 minutes, requires screwdriver
If your existing deadbolt works smoothly and your door is properly aligned, installation is straightforward.
When to Hire a Locksmith
Your door doesn't have an existing deadbolt (new hole needed)
Your door is misaligned or warped
Non-standard door or lock configuration
You want to rekey the lock to match other doors
You're not comfortable with DIY installation
Renter Considerations
Get permission: Most leases prohibit changing locks without landlord approval.
Keep the original: Store your old deadbolt to reinstall when you move.
Retrofit is safest: Retrofit locks leave the exterior unchanged—landlords are more likely to approve.
Provide landlord access: You may need to give your landlord a key or code for emergency access.
10. Common Mistakes When Buying
Mistake 1: Not Checking Door Compatibility
The most common frustration is buying a lock that doesn't fit your door. Measure door thickness, backset, and bore hole size before ordering. Use the manufacturer's compatibility checker.
Mistake 2: Choosing WiFi When Battery Life Matters
WiFi locks drain batteries 2-3x faster than Bluetooth, Z-Wave, or Thread alternatives. If you don't need constant remote access, consider a different connectivity option.
Mistake 3: Expecting Improved Physical Security
Smart locks are about convenience and access management, not making your door harder to break down. If physical security is the goal, reinforce your door frame and strike plate first.
Mistake 4: Ignoring Ecosystem Compatibility
A lock that doesn't work with your smart home platform limits automation potential. Check for Apple Home, Google Home, or Alexa compatibility—or choose Matter for cross-platform support.
Mistake 5: Relying Solely on Auto-Unlock
Auto-unlock (proximity) features are convenient but unreliable. Always have a backup method—keypad, key, or app—for when auto-unlock fails.
Mistake 6: Installing on a Misaligned Door
If your current lock is hard to turn or your door doesn't close smoothly, fix the door before installing a smart lock. Motors struggle with misalignment and will fail prematurely.
11. Budget Guidance
Under $150: Entry Level
Basic keypad locks or simple retrofit options. Bluetooth connectivity, limited smart home integration. Good for testing if smart locks fit your lifestyle.
$150-250: Mid-Range (Best Value)
Most popular options. WiFi or Z-Wave connectivity, keypad or fingerprint access, good smart home integration. This is where most buyers should shop.
$250-400: Premium
Best build quality, multiple connectivity options (WiFi + Thread/Matter), fingerprint readers, premium design. Worth it for front doors on higher-end homes or if specific features matter to you.
No Subscriptions Required
Unlike cameras and doorbells, smart locks generally don't require subscriptions. The purchase price is the full cost. Some brands offer optional premium features, but core functionality is always free.
12. Your Next Step
Choosing a smart lock comes down to practical questions about your door, your household, and how you want to enter your home.
Measure your door. Door thickness, backset, and bore hole size. Use the manufacturer's compatibility checker before purchasing.
Decide: retrofit or replacement? Renters and those who want keypads will have different answers. Retrofit is easier; full replacement offers more features.
Choose your access methods. Will you primarily use keypad, fingerprint, phone, or auto-unlock? Make sure your chosen lock supports what you'll actually use.
Check ecosystem compatibility. Match your smart home platform, or choose Matter for cross-platform flexibility.
Consider connectivity vs. battery life. WiFi for always-on remote access (shorter battery life) or Bluetooth/Z-Wave/Thread for longer battery life.
Use Revimote's Product Finder to filter smart locks by type, connectivity, access methods, and ecosystem. We'll show you what fits your door and lifestyle.
Remember
A smart lock is primarily a convenience upgrade—keyless entry, guest codes, remote access. It won't make your door harder to break down. Choose based on the access methods and smart home integration that fit your daily life, not security theater.
Always measure door thickness, backset, and bore hole before purchasing
No subscriptions required—unlike cameras, smart locks are a one-time purchase
Expecting improved physical security from a smart lock
Ignoring ecosystem compatibility with your existing smart home platform
Relying solely on auto-unlock without backup access methods
Installing a smart lock on a misaligned or warped door