Tired of fumbling for keys or wondering if you locked the door after you left? The world of smart home security has evolved, making it easier than ever to upgrade your traditional deadbolt without a complete overhaul. Enter the best retrofit smart lock solutions – these clever devices attach to your existing hardware, transforming your entry into a keyless, connected portal.
Retrofit smart locks are a game-changer for homeowners and renters alike. They offer the convenience of keyless entry, remote access, and integration with your smart home ecosystem, all while letting you keep your original keys and maintaining your home’s exterior aesthetic. No complicated wiring, no changing the outside look of your door – just a quick, often DIY, installation.
We’ve scoured the market to bring you a comprehensive guide to the top 10 options available, helping you find the perfect match for your needs. Let’s dive into our picks for the best retrofit smart lock options that offer security, convenience, and peace of mind.
1. August Home, Silver Wi-Fi Connected Smart Keyless Entry…
The August Wi-Fi Smart Lock is a perennial favorite for a reason, consistently winning awards for its innovative design and functionality. What sets it apart is its unique approach: it completely hides on the inside of your door, leaving your existing deadbolt and exterior hardware untouched. This means you maintain your home’s curb appeal while gaining full smart lock capabilities, including hands-free auto-unlock as you approach your door. It’s like magic!
- Key Features:
- Upgrades existing deadbolt from the inside, maintaining exterior appearance.
- Grant permanent, scheduled, or temporary access via August app.
- Easy 10-minute installation over most single-cylinder deadbolts.
- Auto-Unlock upon arrival and Auto-Lock with DoorSense.
- Built-in Wi-Fi for direct connection to smart home systems (Alexa, Google Assistant, Apple HomeKit, SmartThings).
- Optional Smart Keypad (sold separately) for code entry.
- Optional biometric recognition for two-factor authentication.
- Pros:
- Extremely discreet – keeps your current exterior lock look.
- Auto-Unlock/Lock features are highly convenient.
- Excellent smart home integration.
- Award-winning reliability.
- Easy DIY installation.
- Cons:
- Keypad sold separately, adding to the cost for code entry.
- Relies on phone for primary unlocking without keypad.
- DoorSense can occasionally be finicky depending on door alignment.
- User Impressions: Users frequently praise the August lock for its ease of installation and the seamless Auto-Unlock feature. Many love that it doesn’t change the exterior look of their door, which is a big plus for homeowners and renters alike. The app is generally considered user-friendly and reliable.
- See it on Amazon here
2. Yale Approach Smart Wi-Fi Deadbolt Retrofit Smart Lock,…
The Yale Approach is Yale’s very first foray into the retrofit smart lock market, aiming to provide ultimate convenience without altering your door’s aesthetic. Like the August, it installs on the inside, letting you keep your keys as a backup while embracing secure keyless access. Its sleek and modern design blends effortlessly with any home décor, making it an appealing choice for those who value both function and subtle style.
- Key Features:
- Installs on the inside of your door, keeping existing deadbolt.
- Secure keyless access via Yale Access app.
- Sleek, simple, and modern design.
- 24/7 control with Activity Feed and included Yale Connect bridge.
- Unlimited virtual keys for sharing access.
- Pros:
- Maintains exterior appearance.
- Easy to share virtual keys.
- Includes Yale Connect for remote access out of the box.
- Clean, minimalist design.
- Cons:
- Does not include a physical keypad, relying solely on app or virtual keys.
- Relatively new to the retrofit market compared to established players.
- User Impressions: Customers appreciate the Yale Approach for its simple installation and the robust functionality of the Yale Access app. The ability to share virtual keys easily is a significant benefit for managing guests or service providers. Its unobtrusive design is also a commonly highlighted positive.
- See it on Amazon here
3. Philips 3000 Series New Version – WiFi Smart Deadbolt…
The Philips 3000 Series steps up the game by offering a comprehensive retrofit solution that includes a smart keypad. This means you get the convenience of app control, voice commands, and the option for fingerprint or code entry without needing to buy extra accessories. It truly transforms your old lock into a smart one with a focus on ease of use and immediate functionality.
- Key Features:
- Transforms regular deadbolt into a smart one without changing exterior.
- Built-in Wi-Fi for direct phone connection (no extra hub needed).
- Instant alerts and activity logs via Philips Home Access APP.
- Included Fingerprint Keypad for code or fingerprint entry.
- Voice control with Alexa & Google Assistant.
- Smart Auto-Locking feature.
- Reliable customer support.
- Pros:
- Built-in Wi-Fi means no separate hub required.
- Includes a fingerprint keypad for versatile entry options.
- Comprehensive activity tracking and notifications.
- Voice control integration.
- Retains use of original keys.
- Cons:
- App ecosystem might be less mature than dedicated smart lock brands.
- Fingerprint recognition can sometimes be inconsistent with varying conditions.
- User Impressions: Reviewers often highlight the convenience of the included keypad, especially the fingerprint option, making it very accessible for all family members. The direct Wi-Fi connection and instant notifications are also highly valued for peace of mind.
- See it on Amazon here
4. Yale Approach Smart Wi-Fi Deadbolt Retrofit Smart Lock,… (Duplicate Entry – Assuming different variant or bundle)
This appears to be another variant of the Yale Approach, emphasizing the same core benefits of convenience and discrete installation. It reinforces the idea of secure, keyless access from anywhere through the Yale Access app, providing the perfect touch to enhance your door without visible changes. The inclusion of batteries simplifies the out-of-the-box experience, ensuring you’re ready to go right away.
- Key Features:
- Ultimate convenience with secure keyless access.
- Inside-only installation, keeping existing deadbolt.
- Sleek, simple, and modern design.
- 24/7 control via Yale Access app’s Activity Feed and included Yale Connect.
- Unlimited virtual keys.
- Batteries included (4 AA).
- Pros:
- Maintains original door aesthetic.
- Remote monitoring and access.
- Includes Yale Connect for out-of-the-box remote functionality.
- Batteries included for immediate use.
- Cons:
- No integrated keypad or fingerprint option in this version.
- Requires a smartphone for primary operation.
- User Impressions: Users value the simple installation and reliable app performance. The ability to manage access remotely and receive activity notifications provides significant peace of mind. Its subtle design often receives positive comments.
- See it on Amazon here
5. Yale Approach with Keypad – Wi-Fi Smart Lock – Retrofit…
This version of the Yale Approach takes convenience up a notch by bundling the smart lock with a Yale Keypad. This is a fantastic option for families or those who prefer entering a code over using their phone. The keypad can be placed anywhere within Bluetooth range, offering flexibility, while the core lock maintains its signature discreet, inside-only installation. Auto-Lock with DoorSense and Auto-Unlock further enhance the hands-free experience.
- Key Features:
- Inside-only installation with included, separately placeable keypad.
- Effortless install for lock and keypad (adhesive/screw mounting).
- Ultimate convenience: lock, unlock, share custom entry codes via Yale Access app and included Yale Connect.
- Customizable entry codes for secure, keyless, trackable access.
- 24/7 control with Activity Feed.
- Auto-Lock with DoorSense and Auto-Unlock.
- One-Touch Locking and backlit keypad buttons.
- Pros:
- Includes a separate keypad for code entry convenience.
- Flexible keypad placement.
- Hands-free Auto-Unlock and Auto-Lock with DoorSense.
- Remote management with Yale Connect.
- Easy DIY installation.
- Cons:
- Keypad is a separate unit, not integrated into the lock itself.
- Relies on Bluetooth range for keypad communication.
- User Impressions: Users are particularly happy with the added convenience of the keypad, which makes sharing access with non-smartphone users or in phone-free moments much easier. The Auto-Unlock feature is frequently highlighted as a major time-saver. Installation is generally considered straightforward.
- See it on Amazon here
6. Lockly Access Touch, 3D Biometric Fingerprint Sensor,…
The Lockly Access Touch stands out by making your finger truly your key. This best retrofit smart lock option integrates a sophisticated 3D biometric fingerprint sensor directly into the lock, offering lightning-fast access in less than half a second. It’s designed for ultimate keyless convenience, while still allowing you to use your physical key as a backup. It’s perfect for those who want quick, secure, and intuitive entry.
- Key Features:
- Attaches to existing deadbolt, transforming it into a smart lock.
- 3D biometric fingerprint reader (stores up to 99 fingerprints).
- Fast access: <0.3sec fingerprint recognition, <0.5sec lock opening.
- Physical key as backup.
- Mobile app provides remote access management and monitoring (with optional Wi-Fi hub).
- Easy DIY installation, no re-keying needed.
- Limited 5-year mechanical/finish warranty, 2-year electronics warranty, lifetime tech support.
- Pros:
- Blazing fast and highly secure fingerprint access.
- Maintains your existing deadbolt and keys.
- Strong warranty and customer support.
- Simple DIY installation.
- Cons:
- Wi-Fi hub is optional and sold separately for remote access.
- No integrated keypad for code entry.
- User Impressions: Customers rave about the speed and reliability of the fingerprint sensor, often calling it a game-changer for quick entry. The ease of installation is also a frequently mentioned positive, and the ability to keep their original keys is a comforting backup.
- See it on Amazon here
7. Keypad Smart Door Lock with Handle: Kucacci Keyless Entry…
The Kucacci Keypad Smart Door Lock offers an incredibly versatile entry solution, blending a traditional handle with multiple smart access methods. This isn’t just a deadbolt retrofit; it replaces your entire knob or lever, providing fingerprint, passcode, app, key fob, and traditional key access. It’s designed for a quick 5-minute installation, making it one of the easiest ways to upgrade your door’s entire entry mechanism.
- Key Features:
- Multiple Access Ways: Fingerprint, Passcode, App, Key Fob, Key, Alexa Voice Unlock (Wi-Fi Gateway Required), Remote Unlock (Wi-Fi Gateway Required).
- Retrofits old door knob/lever or deadbolt lock in 5 minutes with a Philips screwdriver.
- No extra drilling needed, no locksmith required.
- Double security features: low battery alarm, emergency USB power bank option.
- Remote access with KUCACCI Gateway (sold separately).
- AES256 encryption, IP66 weatherproof, wide operating temperature range.
- Pros:
- Offers an impressive array of unlocking methods.
- Extremely easy and quick installation (replaces handle/knob).
- Built for durability in various weather conditions.
- Good security features like low battery alerts and encryption.
- Cons:
- Replaces the entire handle/knob, so it alters the exterior more than internal-only retrofits.
- Wi-Fi Gateway is required and sold separately for remote features.
- Less known brand compared to others on the list.
- User Impressions: Users are generally impressed with the sheer number of access options and the remarkably fast installation process. The fingerprint reader is often cited as responsive, and the overall convenience for families is a significant plus.
- See it on Amazon here
8. Level Bolt (Wi-Fi) Smart Deadbolt – Make Your Lock Smart…
The Level Bolt is the epitome of hidden smart technology. This isn’t just an inside-only attachment; it literally replaces the internal mechanism of your existing deadbolt, making your lock smart without changing keys, hardware, or the visible appearance of your door at all. It’s the most discreet smart lock on the market, ideal for those who want cutting-edge technology without anyone knowing it’s there. The included Level Connect Wi-Fi bridge ensures remote access out of the box.
- Key Features:
- Replaces the internal deadbolt mechanism, not the exterior hardware.
- Completely invisible smart lock – keeps your original keys and door look.
- Includes Level Connect Wi-Fi bridge for remote control (lock/unlock, activity history, key codes).
- Keyless entry via Level Home app.
- Works with Google, Alexa & Apple HomeKit for voice control and automations.
- 6-stage stainless steel gearbox for strength and security.
- FITS MOST EXTERIOR DOORS (check compatibility).
- DIY installation with a single screwdriver.
- Pros:
- The ultimate in discreet smart lock design – completely hidden.
- Maintains existing keys and full exterior appearance.
- Built-in Wi-Fi via included Level Connect bridge.
- Strong smart home ecosystem integration.
- Exceeds security standards for strength.
- Cons:
- More involved installation than some other inside-only retrofits.
- Premium price point.
- No keypad or fingerprint option available directly from Level (though compatible with Level Keypad).
- User Impressions: Customers are consistently amazed by the Level Bolt’s invisible design, highlighting it as the perfect solution for maintaining aesthetics while gaining smart capabilities. While installation might be slightly trickier than a simple August-style install, most find it manageable, and the app is praised for its reliability.
- See it on Amazon here
9. SwitchBot Smart Lock Pro, Keyless Entry Door Lock, Smart…
The SwitchBot Smart Lock Pro is a highly compatible and incredibly easy-to-install retrofit smart lock that’s perfect for tenants or anyone looking for a no-damage solution. Made with durable aluminum alloy, it simply attaches to your existing deadbolt, providing keyless entry without any DIY skills. Its Matter compatibility (with a separate hub) future-proofs your smart home setup, making it a versatile and user-friendly choice.
- Key Features:
- Retrofit design, no DIY needed, simple and quick installation without damaging old parts.
- Wide compatibility with mainstream North American deadbolts.
- Voice Command Compatible, Supports Matter (with SwitchBot Hub 2, sold separately).
- Long battery life (6-9 months, extendable with Dual Power Pack).
- Auto-Lock and real-time notifications (with SwitchBot Hub).
- Part of the SwitchBot Ecosystem for broader home automation.
- Up to 15 unlock methods with Keypad Touch (sold separately), including fingerprint.
- Pros:
- Extremely easy, non-invasive installation, ideal for renters.
- High compatibility with various deadbolts.
- Matter support for future-proof smart home integration.
- Good battery life.
- Extensive unlock methods available with optional accessories.
- Cons:
- Requires SwitchBot Hub 2 for Matter, voice control, and remote features.
- Keypad Touch with fingerprint is sold separately.
- Relies on an adhesive mount for installation.
- User Impressions: Users love the SwitchBot for its absolute simplicity of installation, often calling it the easiest smart lock they’ve ever set up. The wide compatibility and the potential for a full SwitchBot ecosystem are also frequently praised. The battery life generally meets expectations.
- See it on Amazon here
10. eufy Security Smart Lock C220, Fingerprint Keyless Entry…
The eufy Security Smart Lock C220 combines a robust set of features with the convenience of built-in Wi-Fi and a self-learning AI fingerprint sensor. This means direct remote control without a separate bridge and increasingly precise fingerprint recognition over time. It offers a comprehensive solution for keyless entry, including app control, keypad, physical key, Apple Watch access, and voice commands, all within the trusted eufy ecosystem.
- Key Features:
- Built-in Wi-Fi for control from anywhere (no bridge required).
- Self-learning AI fingerprint sensor for quick (<1.5s) and precise unlocking.
- 6 Ways to Unlock: Fingerprint, eufy Security app, Keypad, Physical Key, Apple Watch, Voice (Alexa/Google).
- 8 Months Battery Life (with 8 AA batteries).
- Integrated with eufy ecosystem for routines with other eufy devices.
- Easy 15-minute installation without drilling.
- Security and durability: alarm for unusual attempts, -22℉ to 158℉ operating temperature, IP53 Waterproof.
- Excellent customer service and 18-month protection.
- Pros:
- Built-in Wi-Fi is a major convenience, no extra hub needed.
- Highly accurate and improving fingerprint recognition.
- Versatile unlocking methods, including Apple Watch.
- Strong integration within the eufy smart home ecosystem.
- Durable and weather-resistant design.
- Cons:
- Requires 8 AA batteries, which can be more expensive to replace.
- While easy, it’s a full deadbolt replacement (both interior and exterior).
- User Impressions: Users are very impressed with the eufy C220’s fast and reliable fingerprint sensor, noting how it gets better with use. The built-in Wi-Fi is a definite highlight, simplifying setup and remote access. Many appreciate the solid build quality and the peace of mind offered by the eufy security ecosystem.
- See it on Amazon here
Frequently Asked Questions about Retrofit Smart Locks
Q1: What exactly is a retrofit smart lock?
A: A retrofit smart lock is a device designed to convert your existing traditional deadbolt into a smart lock without replacing the entire locking mechanism or the exterior hardware. Typically, it attaches to the inside of your door, allowing you to keep your original keys and maintain your home’s curb appeal while gaining smart features like keyless entry, remote control, and integration with smart home systems.
Q2: Are retrofit smart locks secure?
A: Yes, generally, retrofit smart locks are highly secure. Since they often work with your existing deadbolt, they maintain the physical security of your current lock. The “smart” features add layers of digital security, such as encryption for communications, activity logs, and the ability to grant temporary access. Reputable brands also adhere to high industry standards for both physical and digital security.
Q3: How difficult is it to install a retrofit smart lock?
A: Most retrofit smart locks are designed for easy, DIY installation, often requiring just a screwdriver and about 10-15 minutes of your time. Unlike full smart lock replacements, you typically don’t need to remove the exterior part of your lock or re-key anything. Always check the specific product’s compatibility with your existing deadbolt before purchasing.
Q4: Do I need Wi-Fi for a retrofit smart lock to work?
A: For basic functions like locking/unlocking via Bluetooth when you’re near the door, Wi-Fi isn’t always strictly necessary. However, to access remote features (like locking/unlocking from anywhere, checking activity logs, or integrating with voice assistants), most smart locks either have built-in Wi-Fi or require a separate Wi-Fi bridge/hub, which often comes with the lock or is sold separately.
Q5: Can I still use my old keys with a retrofit smart lock?
A: Yes! This is one of the biggest advantages of a retrofit smart lock. Since they typically only modify the inside of your deadbolt, your existing keys will continue to work as a traditional backup, offering peace of mind.
Q6: What’s the main difference between a full replacement smart lock and a retrofit smart lock?
A: A full replacement smart lock replaces your entire deadbolt, including both the interior and exterior components. This often means changing the look of your door’s hardware and potentially needing to re-key your locks. A retrofit smart lock, on the other hand, only modifies the interior side of your existing deadbolt, preserving your current exterior hardware and keys.
Q7: Are all retrofit smart locks compatible with smart home systems like Alexa or Google Home?
A: Most modern retrofit smart locks offer compatibility with popular smart home platforms like Amazon Alexa, Google Assistant, Apple HomeKit, or Samsung SmartThings. However, the level of integration (e.g., voice control, routines) can vary. Always check the product specifications to ensure it supports your preferred smart home ecosystem.
Q8: How long do the batteries typically last in these locks?
A: Battery life for retrofit smart locks can vary depending on usage frequency, Wi-Fi connectivity, and battery type. Generally, you can expect anywhere from 6 to 12 months of battery life. Most locks will provide low battery warnings through their app or with an audible alert.
Choosing the best retrofit smart lock really comes down to your priorities: do you want ultimate discretion, built-in fingerprint access, or a comprehensive keypad solution? No matter your preference, there’s a fantastic option out there to transform your home entry into a smart, secure, and convenient experience. Happy locking!