The promise is seductive: unlock your door with your phone, never worry about lost keys again, see who’s coming and going. Smart locks have transformed from tech curiosity to mainstream option.
But should you actually get one?
Smart locks excel at convenience but vary wildly in security. The best smart locks approach traditional lock security while adding features. The worst prioritise app features over physical resistance. If security is your primary concern, a high-quality traditional lock still offers the most reliable protection.
What Makes a Lock “Smart”?
Smart locks replace or supplement traditional key operation with electronic access:
- Keypad entry - Enter a code to unlock
- Smartphone control - Unlock via app, often remotely
- Biometric access - Fingerprint recognition
- Auto-locking - Door locks itself after a set time
- Access logging - Record of who unlocked and when
- Guest codes - Temporary access for visitors
The “smart” part connects this hardware to your home network, usually via WiFi, Bluetooth, or a proprietary hub.
Security Comparison
Physical Security
This is where the divide appears.
Traditional locks at the premium end (TS007 3-star rated cylinders) are engineered specifically to resist physical attack: snapping, drilling, picking, bumping. See our guide on choosing the right lock for detailed comparisons.
Smart locks vary enormously:
| Category | Physical Security |
|---|---|
| Premium smart locks | Approach traditional lock resistance |
| Mid-range smart locks | Basic physical protection, some vulnerabilities |
| Budget smart locks | Often seriously lacking in physical resistance |
Digital Security
Here’s where smart locks introduce entirely new attack surfaces:
- Bluetooth vulnerabilities - Some locks can be exploited wirelessly
- WiFi network security - Lock security depends on your network security
- Cloud account security - Your door security tied to a password
- Software bugs - Updates can introduce vulnerabilities
Real-World Security Assessment
Despite digital concerns, most break-ins remain unsophisticated physical attacks. The question becomes: does your smart lock resist these as well as a quality traditional lock?
For premium smart locks (£200+), often yes. For budget options, often no.
Convenience Comparison
Smart Lock Advantages
No keys to lose or forget The most compelling benefit. You’ll never be locked out because of a forgotten key.
Remote access Let in the cleaner, delivery driver, or family member from anywhere in the world.
Guest codes Create temporary access that expires automatically. No physical key handover required.
Access history Know exactly when children arrived home or whether a contractor actually visited.
Integration Connect with home automation: lights turn on when you unlock, heating adjusts when you lock up.
Traditional Lock Advantages
No batteries to fail Mechanical locks work indefinitely without power.
No connectivity required Works regardless of WiFi, Bluetooth, or network issues.
Simplicity No apps to learn, no accounts to manage, no software updates.
Universal spare keys Anyone can cut a spare at any shop. Smart lock backup keys are often restricted.
Reliability Comparison
Points of Failure
Traditional locks:
- Mechanical wear (gradual, predictable)
- Physical damage
- Key loss
Smart locks:
- All the above, plus:
- Battery depletion
- Software glitches
- Connectivity issues
- Cloud service outages
- Compatibility losses after updates
- Motor mechanism failure
Backup Access
Quality smart locks include physical key backup. This is essential—never install a smart lock without one. If the electronics fail, you need a way in.
Cost Comparison
Initial Purchase
| Lock Type | Typical Cost |
|---|---|
| Budget traditional | £20-50 |
| Quality traditional | £80-150 |
| Budget smart lock | £80-150 |
| Mid-range smart lock | £150-250 |
| Premium smart lock | £250-400+ |
Ongoing Costs
Traditional locks: Essentially zero for years.
Smart locks:
- Battery replacement (£10-20/year)
- Potential subscription for advanced features
- Possible hub purchase for full functionality
- Higher replacement cost when technology outdates
- Regular lock maintenance still required
Installation
Traditional cylinder swaps are often DIY-friendly. Smart locks vary—some replace entire mechanisms requiring professional fitting with associated costs.
Who Should Choose Smart Locks?
Smart Locks Make Sense If:
- You regularly need to grant remote access
- You lose keys frequently
- You want integration with home automation
- You value access logging for security or practical reasons
- You’re willing to invest in premium models with solid physical security
- You maintain good digital security practices
Traditional Locks Make Sense If:
- Security is your absolute priority
- You prefer simplicity and reliability
- You’re buying on a budget
- You don’t need remote access features
- You’re uncomfortable managing connected devices
- You want minimal ongoing maintenance
The Hybrid Approach
Many security-conscious homeowners use both:
- Traditional high-security lock on the front door
- Smart lock on a secondary entrance for convenience
This provides the best physical security where it matters most while gaining smart features where convenient.
What to Look For in a Smart Lock
If you decide to go smart:
Physical Security Checklist
- Solid construction, metal not plastic
- Anti-drill, anti-pick, and anti-snap protection features
- Quality deadbolt mechanism
- Physical key backup
Digital Security Checklist
- End-to-end encryption
- Reputable manufacturer with security track record
- Regular security updates
- Two-factor authentication for app access
- No cloud-only models (should work locally)
Practical Checklist
- Reliable battery life
- Easy battery replacement
- Works with your door type and thickness
- Compatible with your smart home system (if applicable)
The Security Reality Check
Here’s what criminals actually do:
- Most common: Check if door is unlocked
- Second most common: Physical force or simple tools
- Third most common: Break glass or find other entry point
- Rare: Sophisticated lock attacks
- Very rare: Digital exploitation of smart locks
For most homes, a quality lock of either type, combined with other security measures, provides excellent protection. The smart vs traditional debate matters less than simply having a good lock properly fitted.
Making Your Decision
Both traditional and smart locks can provide excellent security when you choose quality products and install them correctly.
Choose traditional if: Security and reliability are paramount, budget is limited, or you prefer simplicity.
Choose smart if: Convenience features have genuine value for your lifestyle, you’ll invest in a quality model, and you maintain good digital security habits.
Either way, invest in quality. A cheap lock—traditional or smart—protects nothing.