Ever wished you could ditch those clunky keys and step into a smarter home without overhauling your entire door? Well, you’re in luck! Retrofit smart locks are here to make that dream a reality. These clever devices attach to your existing deadbolt, transforming it into a high-tech smart lock without changing the look of your door from the outside or requiring complex installations. They’re perfect for renters, homeowners, and anyone looking for an easy upgrade to their home security.
In this guide, we’re diving deep into the world of retrofit smart lock options, highlighting what makes each one special. We’ve done the homework to bring you reviews of 10 top contenders, helping you find the perfect fit for your home.
What Exactly is a Retrofit Smart Lock?
Simply put, a retrofit smart lock is a smart device that mounts on the inside of your door, over your existing deadbolt’s thumbturn. Unlike full smart locks that replace your entire deadbolt, retrofit models keep your original exterior lock and keys intact. This means your home’s curb appeal stays the same, and you always have the option to use a traditional key if needed (though you probably won’t want to once you go smart!).
Why Go for a Retrofit Smart Lock?
Choosing a retrofit model over a full replacement comes with a bundle of benefits:
- Easy Installation: No need for drilling new holes or professional help. Most can be installed in minutes with just a screwdriver.
- Maintain Curb Appeal: Your door’s exterior remains unchanged, preserving its original look.
- Renter-Friendly: Perfect for apartments or rental properties since you don’t alter the original hardware. You can even take it with you when you move!
- Backup Key Access: You can still use your traditional keys, offering peace of mind.
- Cost-Effective: Often more affordable than full smart lock replacements.
- Convenient Access: Enjoy keyless entry, remote control, guest access, and activity logs right from your smartphone.
Ready to see which one might be your home’s next upgrade? Let’s get to the reviews!
Our Top 10 Retrofit Smart Locks Reviewed
August Home, Silver Wi-Fi Connected Smart Keyless Entry…
The August Wi-Fi Connected Smart Lock is a standout choice for those looking to seamlessly integrate smart features without a complete lock overhaul. What truly sets it apart is its built-in Wi-Fi, meaning you don’t need an extra bridge or hub to connect it to your home network and control it remotely. It’s designed to fit right over your existing deadbolt, keeping your original keys as a backup while providing ultimate hands-free convenience with auto-unlock and auto-lock features as you come and go.
- Key Features:
- Upgrades existing deadbolt on the inside of the door.
- Built-in Wi-Fi for remote control (no hub needed).
- Grant permanent, scheduled, or temporary access via the August app.
- Easy 10-minute installation over most single-cylinder deadbolts.
- Auto-unlocks as you approach and auto-locks when closed (with DoorSense).
- Works with Amazon Alexa, Google Assistant, Apple HomeKit, Samsung SmartThings.
- Retains your home’s curb appeal.
- Optional Smart Keypad and biometric ID for enhanced security.
- Pros:
- True built-in Wi-Fi connectivity.
- Very easy and quick installation.
- Excellent integration with popular smart home ecosystems.
- Auto-unlock/lock feature is incredibly convenient.
- Maintains exterior appearance of your door.
- Cons:
- DoorSense (door open/closed sensor) can sometimes be finicky.
- Battery life can vary based on usage and Wi-Fi signal.
- Optional keypad and biometric ID require separate purchases.
- User Impressions: Users frequently praise the August Wi-Fi Smart Lock for its hassle-free installation and reliable auto-unlock feature, calling it a true game-changer for daily convenience. While some users mention occasional app glitches or battery drain, the consensus leans towards a highly positive experience for its core functionality and smart home integration.
- See it on Amazon here
Yale Approach Smart Wi-Fi Deadbolt Retrofit Smart Lock (Instance 1)
The Yale Approach Smart Wi-Fi Deadbolt truly lives up to its name, offering an “approachable” way to elevate your home security. As Yale’s first dedicated retrofit smart lock, it’s designed to blend seamlessly with your existing door hardware. Its ultimate convenience comes from secure keyless access, allowing you to share virtual keys with family and guests, all managed from anywhere via the intuitive Yale Access app. This lock is about making your daily life simpler, without ever having to hide a key again.
- Key Features:
- Installs on the inside of your door, keeping your existing deadbolt.
- Manage and track door activity 24/7 via the Yale Access app.
- Share unlimited virtual keys with friends, family, and guests.
- Sleek, simple, and modern design.
- Included Yale Connect for remote control and notifications.
- Pros:
- Extremely easy to install without altering the door’s exterior.
- Comprehensive app control for remote access and monitoring.
- Unlimited virtual keys simplify guest access.
- Elegant design that complements most home décors.
- Cons:
- Requires the Yale Connect bridge (included) for Wi-Fi features.
- Some users report occasional delays in app responsiveness.
- No built-in keypad or fingerprint reader (requires separate purchase).
- User Impressions: Customers love the straightforward installation and the convenience of managing access through the Yale Access app. The ability to share virtual keys is a big hit, making it ideal for rentals or busy households. While the need for the Yale Connect hub is noted, its inclusion in the package mitigates this concern for most.
- See it on Amazon here
Philips 3000 Series New Version – WiFi Smart Deadbolt…
The Philips 3000 Series steps into the retrofit game with a big advantage: built-in Wi-Fi, meaning no extra hub is needed for remote control! This makes setup super straightforward and keeps your smart home ecosystem clutter-free. What truly makes it shine is the included fingerprint keypad, offering multiple ways to enter – from your phone app to unique codes or a quick finger scan. It’s an all-in-one solution for upgrading your existing deadbolt with modern, convenient access methods.
- Key Features:
- Transforms regular deadbolts into smart ones without changing exterior.
- Built-in Wi-Fi for direct phone connection and remote control.
- Instant phone alerts and detailed activity logs.
- Included Smart Keypad for code and fingerprint entry.
- Voice control compatible with Alexa & Google Assistant.
- Smart auto-locking feature for peace of mind.
- Reliable customer support.
- Pros:
- True built-in Wi-Fi, eliminating the need for a separate hub.
- Fingerprint keypad included, adding versatile entry options.
- Voice control integration for hands-free operation.
- Automatic locking ensures your home is always secure.
- Keeps original key functionality.
- Cons:
- Fingerprint reader performance can vary with conditions (e.g., wet fingers).
- App interface might have a learning curve for some users.
- Battery life can be impacted by heavy Wi-Fi usage.
- User Impressions: Users highly appreciate the convenience of the included fingerprint keypad and the integrated Wi-Fi, which simplifies installation and setup. The auto-lock function is frequently cited as a favorite feature, though some wish for even faster fingerprint recognition. Overall, it’s seen as a solid, feature-rich upgrade for existing locks.
- See it on Amazon here
SwitchBot Smart Lock Pro, Keyless Entry Door Lock, Smart…
The SwitchBot Smart Lock Pro stands out for its wide compatibility and renter-friendly design, making it an excellent choice for a diverse range of door types. Crafted with a durable aluminum alloy casing, it offers a robust build without the need for any drilling or damaging your existing door. For those keen on future-proofing their smart home, its Matter support (with SwitchBot Hub 2) is a huge plus, enabling seamless integration with platforms like Apple HomeKit. Plus, with impressive battery life, it’s designed for hassle-free, long-term use.
- Key Features:
- Wide compatibility with mainstream North American deadbolts.
- Retrofit installation, no DIY needed, doesn’t damage old parts.
- Durable aluminum alloy casing.
- Pro battery life of 6-9 months (extendable to 9-12 with Dual Power Pack).
- Auto-locks with real-time notifications (with SwitchBot Hub).
- Voice command compatible (Alexa, Google, Siri with Hub 2 for Matter).
- Part of the broader SwitchBot ecosystem for home automation.
- Pros:
- Excellent compatibility for various deadbolt types.
- Matter support enhances smart home integration.
- Long battery life reduces maintenance frequency.
- Non-invasive installation is perfect for renters.
- Robust build quality.
- Cons:
- Full smart features (remote access, notifications, Matter) require a separate SwitchBot Hub.
- The “Pro” features like extended battery life come with additional accessory purchases.
- Can be bulky on the inside of the door compared to some competitors.
- User Impressions: Users often highlight the SwitchBot Lock Pro’s ease of installation and its versatility across different door types. The Matter compatibility is a significant draw for tech enthusiasts. While the need for a hub for full functionality is a common point, users generally find its performance reliable and its battery life commendable.
- See it on Amazon here
Lockly Access Touch, 3D Biometric Fingerprint Sensor…
For those prioritizing lightning-fast, secure entry, the Lockly Access Touch is a game-changer. What truly distinguishes this retrofit smart lock is its advanced 3D biometric fingerprint sensor, which unlocks your door in under 0.5 seconds. No more fumbling for keys or remembering codes – your finger truly becomes your key! It’s designed for quick, DIY installation over your existing deadbolt, transforming it into a high-tech access point with minimal effort.
- Key Features:
- Attaches to existing deadbolt for easy conversion.
- Ultra-fast 3D biometric fingerprint reader (<0.3sec recognition, <0.5sec unlock).
- Stores up to 99 fingerprints for multiple users.
- Multiple access modes: fingerprint and physical key.
- State-of-the-art mobile app for remote access (with optional Wi-Fi hub).
- Easy DIY installation with common tools, no re-keying needed.
- Strong warranty and lifetime technical support.
- Pros:
- Exceptional fingerprint recognition speed and accuracy.
- Maintains the use of your original physical key.
- Robust security with 3D biometric sensor.
- Straightforward installation process.
- Excellent customer support and warranty.
- Cons:
- Remote access and monitoring require an optional Wi-Fi hub (Lockly Secure Link).
- The design might be larger than some other retrofit options.
- No keypad for code entry directly on the unit.
- User Impressions: Customers rave about the Lockly Access Touch’s incredibly fast and reliable fingerprint sensor, often citing it as the best feature. The easy installation is also a big plus. While some note the additional cost for the Wi-Fi hub, the convenience and security offered by the biometric access make it a favorite for many.
- See it on Amazon here
Yale Approach Smart Wi-Fi Deadbolt Retrofit Smart Lock (Instance 2)
The Yale Approach Smart Wi-Fi Deadbolt (again, because it’s that popular!) is perfect for those who want a smart lock that feels like it was always meant to be there. This sleek, simple, and modern retrofit smart lock is Yale’s answer to enhancing your door without altering its aesthetic. Beyond its subtle design, it empowers you with constant control, allowing you to track who comes and goes via the Yale Access app’s Activity Feed, ensuring you’re always in the know about your home’s comings and goings, all thanks to the included Yale Connect.
- Key Features:
- Installs on the inside of your door, retaining your existing deadbolt and keys.
- Sleek and minimalist design blends into any home décor.
- Provides 24/7 control over your door with the Yale Access app Activity Feed.
- Share unlimited virtual keys to eliminate the need for physical keys.
- Included Yale Connect for full Wi-Fi capabilities and remote control.
- Comes with 4 AA batteries.
- Pros:
- Unobtrusive design maintains home aesthetics.
- Comprehensive activity tracking for enhanced security monitoring.
- Simple installation without permanent modifications.
- Convenience of virtual keys for guests and family.
- Reliable performance from a trusted brand.
- Cons:
- Requires the Yale Connect module (included) for smart features.
- No physical keypad or fingerprint scanner built-in.
- Battery life is typical for smart locks (requires occasional replacement).
- User Impressions: Many users appreciate the Yale Approach for its subtle design and the robust features of the Yale Access app, particularly the activity log and virtual key sharing. Its ease of installation and the ability to keep original keys are frequently mentioned benefits, making it a favorite for those seeking a balance of smart features and design integrity.
- See it on Amazon here
Anona Holo Wi-Fi Smart Lock with Keypad, Keyless Entry…
The Anona Holo Wi-Fi Smart Lock stands out by offering direct Wi-Fi connectivity without a separate hub, combined with advanced anomaly detection. This retrofit smart lock not only simplifies installation over most single-cylinder deadbolts but also brings peace of mind with its built-in inertial sensor that detects if the door is truly closed and locks automatically. It even alerts you via buzzer or app notification if the lock is jammed or left open, ensuring your home is secure and you’re always informed.
- Key Features:
- No-hub Wi-Fi connectivity, compatible with Alexa, Apple HomeKit.
- Easy installation over most single-cylinder deadbolts.
- Auto-Lock feature with built-in inertial sensor for door status detection.
- Anomaly Detection: alerts for jammed or left-open doors.
- Durable battery life (4-6 months in standard Wi-Fi mode).
- Personalized management: share temporary or one-time passcodes via Anona App.
- Optional low power mode for extended battery life.
- Pros:
- Direct Wi-Fi connection, eliminating the need for a hub.
- Intelligent auto-lock and anomaly detection for enhanced security.
- Matter ecosystem support for broader smart home integration.
- Good battery life for a Wi-Fi enabled lock.
- Retains original key functionality.
- Cons:
- The “keypad” is likely a separate accessory, not directly integrated into the retrofit unit itself. (Based on similar product structures).
- App interface might have a learning curve.
- Buzzer alerts might be too loud for some.
- User Impressions: Users are particularly impressed with the Anona Holo’s direct Wi-Fi and the smart auto-lock and anomaly detection features, highlighting the enhanced sense of security they provide. The ease of installation is consistently praised, making it a popular choice for straightforward smart upgrades.
- See it on Amazon here
August Home Smart Lock, 3rd Generation – Silver
The August Home Smart Lock, 3rd Generation, is designed for ultimate simplicity and renter-friendliness, making it a fantastic entry point into smart home security. This retrofit smart lock replaces only the thumbturn on the inside of your door, leaving your exterior untouched and your original keys fully functional. Its standout feature for everyday convenience is the reliable auto-unlock as you approach and auto-lock after you leave, making it ideal for busy families or when your hands are full.
- Key Features:
- Replaces only the inside thumbturn, keeping existing exterior lock.
- Lock and unlock with the August app or Apple Watch.
- Auto-unlocks as you arrive, auto-locks when closed or after a set time.
- Easy 10-minute installation on most single-cylinder deadbolts.
- Renter-friendly design, easily removable when moving.
- DoorSense technology confirms door open/closed status.
- Pros:
- Extremely easy and non-invasive installation.
- Highly convenient auto-unlock/lock features.
- Perfect for renters who want smart features without permanent changes.
- Maintains the traditional look of your door from the outside.
- Trusted brand with a solid app.
- Cons:
- Requires the August Connect Wi-Fi bridge (sold separately) for remote access/smart home integration.
- No built-in keypad or fingerprint reader.
- Auto-unlock relies on geofencing and can occasionally be inconsistent.
- User Impressions: Users consistently praise the 3rd Gen August lock for its straightforward installation and the incredible convenience of its auto-unlock feature. Renters particularly love its non-permanent nature. While the need for a separate Wi-Fi bridge is a common point, its overall reliability and ease of use make it a popular choice.
- See it on Amazon here
eufy Security Retrofit Smart Lock E110+Wireless Keypad…
The eufy Security Retrofit Smart Lock E110 comes with a wireless keypad, offering a comprehensive and secure entry solution without any external alterations to your door. What truly sets this retrofit smart lock apart is its focus on privacy and convenience: it stores your in-app data locally using AES128 encryption, keeping your personal information safe from the cloud. With five ways to unlock, including auto-unlock, remote control, voice, keypad, and original keys, it offers unparalleled flexibility for every household member.
- Key Features:
- Ideal for renters and landlords; installs in 10 minutes over existing deadbolt.
- Remote control via the eufy Security app from anywhere.
- Auto-locking and auto-unlocking (via geofencing for iOS).
- 5 ways to unlock: Auto Unlock, app, voice, wireless keypad (included), original keys.
- Advanced security with local AES128 encryption for in-app data.
- Exterior of the door remains unchanged.
- Pros:
- Included wireless keypad adds versatile entry options.
- Strong emphasis on data privacy with local storage.
- Multiple unlocking methods cater to all preferences.
- Very easy installation and renter-friendly.
- Reliable auto-lock/unlock features.
- Cons:
- Auto-unlock for iOS devices uses geofencing, which can sometimes drain phone battery.
- Wireless keypad requires batteries.
- Full smart home integration might be more limited compared to some competitors.
- User Impressions: Customers frequently highlight the eufy E110 for its ease of installation and the convenience of the included keypad, which is a big hit for families. The focus on local data storage is also a significant plus for privacy-conscious users. Its multiple unlocking options are praised for their flexibility and reliability.
- See it on Amazon here
Nuki Smart Lock & Keypad 2, Keyless Door System with…
The Nuki Smart Lock & Keypad 2 offers a complete keyless entry system that is truly “invisible from outside,” perfect for those who prioritize aesthetics and European craftsmanship. This clever retrofit smart lock mounts easily over your single-cylinder deadbolt without any drilling, making it ideal for both renters and homeowners. Its integration with Apple Home, Alexa, Google Home, and especially Matter over Thread support, positions it as a highly versatile and future-proof option for seamless smart home control. The included Keypad 2 with fingerprint and code access adds incredible flexibility.
- Key Features:
- Invisible from outside, mounts over single-cylinder deadbolt.
- Easy 15-minute, drill-free installation.
- Works with Apple Home, Alexa, Google Home, and SmartThings.
- Supports Matter over Thread for enhanced smart home control.
- Nuki Keypad 2 included: access via fingerprint (20 prints) or code (200 codes).
- “Made in Europe” quality with focus on privacy (no account needed).
- Nuki Premium features included for early birds (remote access, alerts, etc.).
- Pros:
- Excellent design: completely hidden from the exterior.
- Robust and versatile Keypad 2 with fingerprint and code access.
- Strong smart home ecosystem compatibility, including Matter over Thread.
- Simple, non-invasive installation.
- Focus on user privacy.
- Cons:
- Nuki Premium features become a subscription after a certain period.
- Can be a higher price point than basic retrofit options.
- Physical lock unlocking speed is fast but not instantaneous.
- User Impressions: Users are consistently impressed with the Nuki Smart Lock’s discreet design and the seamless integration provided by the Keypad 2, especially the fingerprint reader. Its Matter over Thread compatibility is a significant advantage for smart home enthusiasts. The ease of installation and quality feel are also highly rated.
- See it on Amazon here
Frequently Asked Questions about Retrofit Smart Locks
Q1: What’s the main difference between a retrofit smart lock and a full replacement smart lock?
A1: A retrofit smart lock attaches to the inside of your existing deadbolt’s thumbturn, leaving the exterior of your door and your original key mechanism untouched. A full replacement smart lock, on the other hand, completely replaces your existing deadbolt, including the exterior hardware. Retrofit options are generally easier to install, renter-friendly, and maintain your door’s aesthetic.
Q2: Are retrofit smart locks as secure as traditional deadbolts or full smart locks?
A2: Yes, retrofit smart locks are generally very secure. They don’t compromise the physical integrity of your existing deadbolt – they simply automate its operation. The security of the lock itself remains dependent on your original deadbolt. Additionally, they add layers of digital security like encryption, activity logs, and remote monitoring, which traditional locks lack.
Q3: How easy is it to install a retrofit smart lock? Can I do it myself?
A3: Absolutely! One of the biggest advantages of retrofit smart locks is their ease of installation. Most models can be installed in 10-15 minutes using just a screwdriver, as they typically only require you to remove and replace the thumbturn on the inside of your door. No drilling or wiring is usually needed, making them perfect for DIY enthusiasts.
Q4: Do I still need my old keys with a retrofit smart lock?
A4: You can keep your old keys as a backup, and they will still work with your existing exterior lock. However, with a retrofit smart lock, you’ll likely find yourself rarely needing them, thanks to convenient keyless entry methods like smartphone apps, passcodes, or fingerprint access.
Q5: What smart home systems are compatible with these locks?
A5: Many retrofit smart lock models offer broad compatibility with popular smart home ecosystems. Look for features like Wi-Fi (built-in or via a hub), Bluetooth, and integration with platforms such as Amazon Alexa, Google Assistant, Apple HomeKit, Samsung SmartThings, and increasingly, Matter over Thread. Always check the specific product’s compatibility list before purchasing.
Q6: How long do the batteries last in a retrofit smart lock?
A6: Battery life varies depending on the model, usage frequency, and whether it uses Wi-Fi directly or a Bluetooth connection. Typically, you can expect batteries to last anywhere from 6 to 12 months. Most smart locks will provide low battery alerts via their app, giving you plenty of time to replace them.
Q7: Can I use a retrofit smart lock on a rental property?
A7: Yes, retrofit smart locks are often an excellent choice for rental properties. Since they don’t alter the exterior of the door and don’t require permanent modifications like drilling, they are renter-friendly. You can easily install them when you move in and remove them when you move out, restoring the original lock.
Ready to Upgrade Your Home?
A retrofit smart lock is a fantastic way to bring modern convenience and enhanced security to your home without the fuss of a full lock replacement. Whether you’re a renter looking for a temporary upgrade or a homeowner who loves their door’s current look, there’s a perfect retrofit solution out there. With easy installation, seamless smartphone control, and features like auto-locking and guest access, these smart devices are truly a step forward for any smart home.
Take a closer look at the options we’ve reviewed, and get ready to experience a smarter, more secure home!