Tired of fumbling for keys or wondering if you locked the door after you left? Welcome to the world of smart locks! But what if you don’t want to replace your entire door hardware? That’s where a smart lock retrofit comes in, offering a brilliant way to modernize your home security without a full overhaul. These clever devices essentially turn your existing deadbolt into a smart one, often installing on the inside of your door and keeping your home’s exterior aesthetic intact. It’s a fantastic way to dip your toes into smart home automation without extensive DIY.
Whether you’re a homeowner looking for advanced security features, a renter wanting temporary smart access, or just someone craving the ultimate convenience of keyless entry, a smart lock retrofit can be a game-changer. You’ll gain remote control, activity tracking, and often hands-free locking/unlocking, all while still being able to use your traditional keys as a backup.
We’ve scoured the market to bring you the top 10 smart lock retrofit options that are making waves for their ease of installation, robust features, and reliable performance. Let’s dive in and find the perfect upgrade for your front door!
1. August Home, Silver Wi-Fi Connected Smart Keyless Entry
The August Wi-Fi Smart Lock stands out as a true innovator in the retrofit space, allowing you to seamlessly upgrade your existing deadbolt without altering the exterior look of your home. It’s perfect for maintaining your home’s curb appeal while gaining cutting-edge smart features. With built-in Wi-Fi, you get remote control right out of the box, no extra bridge needed, making it super convenient for managing access from anywhere. Its award-winning design and wide compatibility with smart home ecosystems make it a top contender for effortless home security.
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Key Features:
- Upgrades existing deadbolt from the inside, keeping original keys.
- Built-in Wi-Fi for remote control and voice assistant integration (Alexa, Google Assistant, Apple HomeKit, Samsung SmartThings).
- Auto-Unlock as you approach and Auto-Lock with DoorSense.
- Share permanent, scheduled, or temporary access via August app.
- Easy 10-minute installation over most single-cylinder deadbolts.
- Award-winning smart lock (CNET Editor’s Choice, Good Housekeeping, Tom’s Guide).
- Optional keypad and biometric ID for additional access methods.
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Pros:
- Preserves exterior aesthetics and existing keys.
- True hands-free auto-unlock and auto-lock.
- Excellent smart home ecosystem compatibility.
- Very simple and quick installation.
- Reliable and recognized brand.
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Cons:
- Optional keypad and biometric features are sold separately.
- Wi-Fi connectivity might lead to slightly faster battery drain.
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User Impressions: Users consistently praise the August lock for its straightforward installation and the seamless Auto-Unlock feature, calling it incredibly convenient for daily use. Many appreciate that it keeps the traditional look of their door while adding powerful smart capabilities. Some note that battery life can vary depending on Wi-Fi usage.
2. Yale Approach Smart Wi-Fi Deadbolt Retrofit Smart Lock
The Yale Approach is a sleek and modern smart lock retrofit that brings Yale’s trusted security directly to your existing deadbolt. Designed to install on the inside of your door, it maintains your home’s exterior appearance while providing robust keyless entry and monitoring. It’s Yale’s first foray into the purely retrofit market, offering ultimate convenience with virtual keys and a comprehensive activity feed through the Yale Access app, ensuring you’re always in control of who comes and goes.
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Key Features:
- Inside-only installation, keeping existing deadbolt and keys.
- Secure keyless access via Yale Access app.
- Share unlimited virtual keys for family, friends, and guests.
- 24/7 activity feed to track door events.
- Blends seamlessly into any home décor.
- Includes Yale Connect for remote access.
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Pros:
- Easy installation without altering exterior.
- Reliable Yale brand security.
- Excellent app control and activity logging.
- Sleek and discreet design.
- Unlimited virtual keys for easy access sharing.
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Cons:
- Relies heavily on the Yale Access app for full functionality.
- May not offer as many physical unlock options (like built-in keypad/fingerprint) as some full-replacement smart locks.
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User Impressions: Customers love the Yale Approach for its simplicity and the peace of mind it offers. The ability to share virtual keys and monitor door activity remotely is a huge hit, making it ideal for managing guest access or just keeping an eye on things.
3. Philips 3000 Series New Version – WiFi Smart Deadbolt Retrofit Lock
The Philips 3000 Series steps up the smart lock retrofit game by not only providing easy smart capabilities for your existing deadbolt but also including a versatile fingerprint keypad right in the box. This means you get the convenience of built-in Wi-Fi for remote control and voice commands, plus the added flexibility of fingerprint or code access for guests – all without needing extra purchases. It’s a robust solution for a truly connected and secure home.
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Key Features:
- Transforms regular deadbolt into a smart lock without changing exterior.
- Built-in Wi-Fi for direct phone connection (Philips Home Access APP).
- Instant alerts and activity logs for real-time monitoring.
- Included Smart Keypad for fingerprint and unique code entry.
- Voice control compatible with Alexa & Google Assistant.
- Smart Auto-Locking for automatic home security.
- Comprehensive customer support.
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Pros:
- Built-in Wi-Fi and included fingerprint keypad offer great value.
- Multiple convenient ways to unlock (app, fingerprint, code, voice).
- Automatic locking provides added security.
- Strong customer support.
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Cons:
- App interface may require some getting used to for new users.
- Philips is newer to the smart lock market compared to some competitors.
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User Impressions: Users highly rate the Philips 3000 Series for its inclusive package, especially the integrated fingerprint keypad, which simplifies access for everyone. The built-in Wi-Fi is also a big plus, eliminating the need for separate hubs and making setup straightforward.
4. SwitchBot Smart Lock Pro, Keyless Entry Door Lock
The SwitchBot Smart Lock Pro is a compelling smart lock retrofit option, especially if you’re already invested in the SwitchBot ecosystem or value broad compatibility. Its aluminum alloy casing ensures durability, and its retrofit design means no damage to your existing door. With Matter support (via SwitchBot Hub 2), it’s future-proof for seamless integration into various smart home platforms, offering a wide array of unlock methods when paired with SwitchBot accessories. Plus, its impressive battery life keeps you worry-free for months.
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Key Features:
- Retrofit design for easy, non-damaging installation on mainstream deadbolts.
- Aluminum alloy casing for enhanced durability.
- Voice command compatible and supports Matter (with SwitchBot Hub 2, sold separately).
- Pro Battery Life: 6-9 months on 4xAA batteries, extendable with Dual Power Pack.
- Auto-Lock and real-time notifications (with SwitchBot Hub).
- Part of the SwitchBot Ecosystem for expanded smart home automation.
- Up to 15 unlock methods with optional SwitchBot Keypad Touch (fingerprint, passcodes, remote, voice).
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Pros:
- Wide compatibility with existing deadbolts.
- Durable build quality.
- Excellent battery life.
- Future-proof with Matter support.
- Highly versatile with the SwitchBot ecosystem and accessories.
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Cons:
- Requires SwitchBot Hub 2 for Matter support and remote notifications.
- Most advanced unlock methods (like fingerprint) require additional purchase of a Keypad Touch.
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User Impressions: Reviewers are often impressed by the SwitchBot Lock Pro’s robust build and its seamless integration into their smart home, particularly appreciating the Matter support. The long battery life is a recurring positive, though some mention the added cost of the Hub and Keypad for full functionality.
5. Lockly Access Touch, 3D Biometric Fingerprint Sensor
For those prioritizing quick and secure biometric access, the Lockly Access Touch is a standout smart lock retrofit solution. It easily attaches to your existing deadbolt, transforming it into a smart lock with a lightning-fast 3D biometric fingerprint reader. Your finger truly becomes your key, offering incredibly rapid and secure entry. While it keeps things simple on the outside, its advanced internal technology provides peace of mind and effortless access for authorized users.
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Key Features:
- Easy retrofit installation onto your existing deadbolt.
- Ultra-fast 3D biometric fingerprint reader (<0.3 sec recognition, <0.5 sec open).
- Stores up to 99 fingerprints for multiple users.
- Physical key backup for traditional entry.
- State-of-the-art mobile app for remote access management and monitoring (with optional Wi-Fi hub).
- Easy DIY installation with common household tools.
- Limited 5-year mechanical, 2-year electronics warranty, plus lifetime tech support.
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Pros:
- Industry-leading fingerprint recognition speed and accuracy.
- Simple installation that doesn’t require re-keying.
- Excellent security with 3D biometric sensor.
- Robust warranty and customer support.
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Cons:
- Wi-Fi hub for remote access is an optional, separate purchase.
- Limited to fingerprint and physical key as primary access modes without the hub.
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User Impressions: Users rave about the Lockly Access Touch’s fingerprint accuracy and speed, often calling it a “game-changer” for convenient entry. Many highlight its reliable performance and the ease of turning their “dumb lock” into a smart one without much hassle.
6. Tapo Smart Wi-Fi Deadbolt Door Lock – Keyless Tactile Buttons
While many “retrofit” locks focus on keeping your existing exterior, the Tapo Smart Wi-Fi Deadbolt offers a different kind of simple upgrade: a full deadbolt replacement designed for incredibly easy, no-drilling installation. It’s built for convenience and security, featuring multiple unlock methods including a keyless tactile keypad, app control, and voice commands. If you’re okay with a new exterior look but want installation that feels like a smart lock retrofit, this is a solid choice. It’s durable, weather-resistant, and seamlessly integrates with popular smart home platforms.
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Key Features:
- Full deadbolt replacement designed for easy installation without drilling.
- Multiple unlock ways: keyless keypad, Bluetooth, remote Wi-Fi via Tapo App, voice commands (with PIN), 2 backup keys.
- Create customizable access codes (up to 200).
- Backlit keypad with “random digits” security feature.
- AA Battery Powered (up to 200-300 days) with USB-C for emergency power.
- Real-time alerts, remote lock/unlock, and activity tracking.
- Auto-Lock and PIN Attempt Limiter for enhanced security.
- BHMA Grade 3 certified for durability and IP54 weatherproof rating.
- Smart Home Integration with Alexa, Google Home, Samsung SmartThings.
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Pros:
- Comprehensive array of unlock methods.
- Built-in keypad is a huge convenience.
- High durability and weather resistance.
- Long battery life with emergency power option.
- Strong smart home compatibility.
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Cons:
- Replaces the entire deadbolt, changing the exterior appearance.
- Voice commands require PIN verification which can be less convenient for quick unlocks.
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User Impressions: Customers love the Tapo DL100 for its robust features and the convenience of having a built-in keypad. Its durability and easy installation are frequently highlighted, making it a popular choice for those looking for a complete, yet simple, smart deadbolt solution.
7. Yale Approach Smart Wi-Fi Deadbolt Retrofit Smart Lock
It’s clear that the Yale Approach is a popular choice for good reason, appearing on our list twice! This highly-rated smart lock retrofit from Yale continues to impress with its minimalist design and powerful internal features. It installs discreetly on the inside of your door, allowing you to keep your traditional keys while embracing a fully connected smart home experience. It’s perfect for families, short-term rentals, or anyone who values secure keyless access and comprehensive activity tracking through the intuitive Yale Access app.
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Key Features:
- Installs on the inside of your door, preserving existing deadbolt and keys.
- Enjoy secure keyless access with the Yale Access app.
- Share unlimited virtual keys with trusted individuals.
- Monitor door activity 24/7 with the Activity Feed.
- Sleek, simple, and modern design blends with any décor.
- Includes Yale Connect for remote functionality.
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Pros:
- Unobtrusive design maintains home aesthetics.
- Reliable brand known for security.
- Excellent for managing guest access with virtual keys.
- Real-time monitoring provides peace of mind.
- Included Yale Connect ensures full remote capabilities.
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Cons:
- Doesn’t offer physical keypad or fingerprint options directly on the unit.
- Relies heavily on smartphone for primary access.
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User Impressions: Users consistently praise the Yale Approach for its reliability and ease of use, especially for remote access management. Its discreet design and the ability to continue using traditional keys are frequently cited as major advantages.
8. August Home Smart Lock, 3rd Generation – Silver
The August Home Smart Lock 3rd Generation offers a fantastic entry point into smart home security for those who prioritize simplicity and renter-friendliness. Like its Wi-Fi-enabled sibling, this smart lock retrofit replaces only the thumbturn on the inside of your door, leaving the exterior unchanged and your existing keys fully functional. It brings August’s renowned auto-lock and auto-unlock features, making coming and going an absolute breeze – perfect for when your hands are full!
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Key Features:
- Replaces only the inside thumbturn, keeping existing exterior lock.
- Lock and unlock with the August app on your phone or Apple Watch.
- Auto-Unlocks as you get home; Auto-Locks with DoorSense.
- Easy 10-minute installation on most single-cylinder deadbolts.
- Renter-friendly – easily remove and take it with you when you move.
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Pros:
- Extremely easy and quick installation.
- Maintains curb appeal and allows use of original keys.
- Ideal for renters due to non-permanent installation.
- Hands-free auto-unlock and auto-lock are highly convenient.
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Cons:
- This 3rd Gen model requires a separate August Connect Wi-Fi bridge (sold separately) for remote access.
- Fewer advanced features compared to the Wi-Fi connected version.
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User Impressions: Users consistently highlight the 3rd Gen August lock’s renter-friendly design and the sheer convenience of its auto-unlock feature. It’s often recommended for those seeking a simple, non-invasive smart lock upgrade without compromising on core smart functionalities.
9. Nuki Smart Lock & Keypad 2, Keyless Door System
The Nuki Smart Lock & Keypad 2 system offers a comprehensive and highly secure smart lock retrofit solution, proudly made in Europe. This innovative system installs invisibly from the outside, attaching over your single-cylinder deadbolt in minutes, making it perfect for both renters and homeowners. Its standout feature is the included Keypad 2, which offers both fingerprint and code access, providing versatile keyless entry options for everyone. Plus, with Matter over Thread support, it’s ready for advanced smart home integration.
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Key Features:
- Retrofit installation over single-cylinder deadbolt (15 mins, no drilling).
- Invisible from outside, maintains exterior look.
- Ultra-fast unlock in under 1 second.
- Smart integrations with Apple Home, Alexa, Google Home, SmartThings, and Matter over Thread.
- Included Nuki Keypad 2 for fingerprint (20 prints) or code (200 codes) access.
- Nuki Premium included for early birds (remote access, alerts, smart hosting).
- Focus on privacy with no account needed for full functionality.
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Pros:
- Excellent speed and security.
- Included fingerprint keypad is a significant value.
- Matter over Thread support for cutting-edge smart home integration.
- Ideal for renters due to non-invasive installation.
- Privacy-focused design.
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Cons:
- Nuki Premium features become subscription-based after an initial period.
- May be a pricier option upfront compared to some basic retrofit locks.
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User Impressions: Users frequently praise the Nuki system for its speed, the convenience of the included fingerprint keypad, and its robust smart home compatibility, especially the Matter over Thread integration. Its “invisible from outside” design is a big plus for many.
10. eufy Security Retrofit Smart Lock E110+Wireless Keypad
The eufy Security Retrofit Smart Lock E110 delivers a fantastic blend of security, convenience, and privacy, making it an excellent choice for a smart lock retrofit. Designed with renters and landlords in mind, it installs quickly over your existing deadbolt without altering the exterior, allowing original keys to still function. With 5 ways to unlock, including an included wireless keypad and smart auto-unlock via geofencing, it offers incredible flexibility. Eufy’s commitment to advanced security with local data storage provides an extra layer of peace of mind.
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Key Features:
- Retrofit installation over existing deadbolt (10 mins), exterior remains unchanged.
- Ideal for renters and landlords.
- Remote control via eufy Security app.
- Auto Locking and Auto Unlocking (with iOS geofencing).
- 5 Ways to Unlock: app, voice, included wireless keypad, original keys, auto-unlock.
- Advanced Security: local data storage with AES128 encryption chip.
- Wireless keypad included for code entry.
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Pros:
- Very renter-friendly and non-invasive.
- Generous 5 unlock methods, including an included keypad.
- Strong focus on data privacy with local storage.
- Convenient auto-locking and auto-unlocking.
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Cons:
- Auto-unlock via geofencing might be iOS-specific.
- Some users may prefer a built-in keypad over a separate wireless one.
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User Impressions: Customers appreciate the eufy Retrofit Smart Lock for its ease of installation and the security of local data storage. The included wireless keypad and the reliable auto-lock feature are frequently cited as major conveniences, making it a great value for those seeking a comprehensive retrofit solution.
Frequently Asked Questions (FAQ)
Q1: What exactly is a smart lock retrofit?
A1: A smart lock retrofit is a device that attaches to your existing deadbolt (usually on the inside of your door) to add smart functionality without requiring you to replace the entire lock mechanism or change your door’s exterior appearance. It essentially makes your current deadbolt “smart.”
Q2: Why should I choose a retrofit smart lock over a full replacement?
A2: Retrofit smart locks are ideal for several reasons: they’re much easier to install (often in minutes), they preserve your home’s exterior aesthetics, and they allow you to continue using your original keys as a backup. They’re also perfect for renters who want smart home convenience without permanent alterations.
Q3: Are smart lock retrofits secure?
A3: Yes, quality smart lock retrofits are very secure. Since they work with your existing deadbolt (which is typically already a strong, traditional lock), they add a layer of digital security on top. They use strong encryption for digital communication and often include features like activity logs and auto-locking to enhance your home’s safety.
Q4: Do I still need my old keys with a retrofit smart lock?
A4: Most smart lock retrofits are designed to work with your existing keys, allowing you to keep them as a traditional backup method of entry. This is a key advantage, offering flexibility and peace of mind in case of battery drain or tech issues.
Q5: How easy is it to install a smart lock retrofit?
A5: Installation is generally very easy! Most models are designed for DIY installation in under 15 minutes with just a screwdriver. You usually just remove the thumbturn from your existing deadbolt and attach the retrofit device in its place on the inside of the door.
Q6: Are retrofit smart locks compatible with all deadbolts?
A6: While most retrofit smart locks are designed to fit standard single-cylinder deadbolts, it’s crucial to check the product’s compatibility specifications before purchasing. Some may not work with double-cylinder deadbolts or very old/unusual lock mechanisms.
Q7: Can I integrate a smart lock retrofit with my existing smart home system?
A7: Absolutely! Many smart lock retrofits offer compatibility with popular smart home ecosystems like Amazon Alexa, Google Assistant, Apple HomeKit, Samsung SmartThings, and Matter. Look for “built-in Wi-Fi” for direct integration or see if a separate bridge/hub is required for remote access and voice control.
Q8: What about battery life for these devices?
A8: Battery life varies greatly depending on the model, usage frequency, and whether it has built-in Wi-Fi (which typically consumes more power). Most run on standard AA or AAA batteries and can last anywhere from 6 months to over a year. Apps usually provide low-battery notifications.