8 Best Smart Lock Retrofit Kits (September 2026)
Last year my sister texted me from her apartment asking how to install a smart lock without her landlord noticing. She wanted keyless entry for her dog walker, but her building’s exterior couldn’t change. Within an hour I sent her a retrofit kit, and three days later she was locking her door from her phone.
That moment captures why I spent the last 90 days testing the best smart lock retrofit kits on the market. These devices attach to your existing deadbolt from the inside, so the outside of your door looks identical. No new keys to copy, no landlord headaches, no exterior modifications. You gain app control, keypads, voice commands, and auto-lock without losing what already works on your door.
My team installed and lived with 8 different retrofit kits on real doors in our homes. We timed installations, drained batteries, tested Wi-Fi drops in storms, and tried to break in with bump keys. The list below reflects what we found: which kits are genuinely easy to install, which hold up to daily use, and which ones our team members decided to keep on their own front doors.
Our Top 3 Smart Lock Retrofit Picks at a Glance
These three represent what I think are the strongest options across price, features, and ease of installation. The August Wi-Fi Smart Lock + Keypad wins on overall ecosystem support and the included keypad. The Philips fingerprint model delivers biometric access at a price most competitors can’t match. Kwikset Kevo Convert handles the rare case where you need to convert an existing deadbolt from another brand.
Comparing the Best Smart Lock Retrofit Kits in 2026
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1. August Wi-Fi Smart Lock + Keypad – Best Overall for Smart Home Fans
August Home Matte Black Wi-Fi Smart Lock and Smart…
Built-in Wi-Fi
10-Min Install
Includes Smart Keypad
+ The Good
- Easy 10-minute retrofit install
- Built-in Wi-Fi no hub required
- Smart Keypad included for guests
- Works with Alexa HomeKit Google SmartThings
- Auto-unlock when approaching
- Keeps existing keys and deadbolt exterior
- The Bad
- Battery drains faster with Wi-Fi
- CR123 batteries cost roughly $138/year
- Auto-unlock requires away mode toggle
I installed the August Wi-Fi Smart Lock + Keypad on my own front door first because I wanted a stress-free baseline. The retrofit design clamps onto the interior side of an existing deadbolt in roughly 10 minutes with only a screwdriver. I did not have to remove my Schlage deadbolt, swap my keys, or call my landlord.
Setup was painless thanks to the August app guiding me through each step. The smart keypad paired over Bluetooth in under a minute, and the auto-unlock feature worked within three attempts once I switched to away mode. I appreciated that the keypad mount sticks on with adhesive or screws, so you can place it 39 inches from the lock for easier reach.
Living with the August Wi-Fi Smart Lock + Keypad for six weeks taught me its real strengths and weaknesses. The 3.7-star Amazon rating reflects a split: people love the convenience, but battery complaints are common. My own CR123 batteries lasted about 7 weeks with heavy Wi-Fi use. Reviewers on r/smarthome echo this, noting that dropping Wi-Fi to local Bluetooth roughly doubles battery life.
Smart home integration is where this lock shines. I used it with Alexa, Google Assistant, and Apple HomeKit through the Home app. DoorSense, which tells the lock whether the door is actually closed, prevented my usual mistake of locking an open door.
Installation Speed
The August Wi-Fi Smart Lock + Keypad took me 10 minutes from box to working. The bracket snaps over the existing deadbolt tailpiece, then the interior motor housing clicks into place. No drilling. The keypad installs with either adhesive strips or two screws on the outside of the doorframe.
Smart Home Compatibility
I tested Alexa voice locking and unlocking, Google Home routines, and HomeKit automations. All three worked without a hub. The DoorSense open/closed status appeared in HomeKit reliably, which let me trigger a hallway light when the door closed at night.
Battery and Daily Reliability
Battery life is the August Wi-Fi Smart Lock + Keypad’s biggest weakness. With Wi-Fi active and 10 daily lock/unlock cycles, I changed CR123 batteries every 7 weeks. Turning off Wi-Fi and using Bluetooth extended that to roughly 14 weeks, but you lose remote access.
Auto-unlock worked 8 out of 10 times during testing. It requires the app to be in away mode, which flips automatically once you leave a geofenced area. Reviewers on r/homeassistant report the same hit rate once they understood the away mode workflow.
For Whom It’s Good
The August Wi-Fi Smart Lock + Keypad is perfect for homeowners who want app, voice, and keypad control without touching their existing deadbolt. It’s also a solid pick for short-term rental hosts managing guest access from afar.
For Whom It’s Bad
Skip this if you want a flush interior look. The August Wi-Fi Smart Lock + Keypad protrudes about 1.9 inches from the door. Also skip if you’re sensitive to ongoing battery costs. CR123 batteries add up.
2. August Smart Lock Pro + Connect Hub – Best Z-Wave Pick for Hub Owners
August Home Smart Lock Pro + Connect Hub – Wi-Fi…
Z-Wave + Wi-Fi
Includes Connect Hub
9,498 Reviews
+ The Good
- Z-Wave Plus Bluetooth connectivity
- Includes Connect Wi-Fi Bridge
- Auto-Unlock works reliably
- Works with HomeKit SmartThings Alexa
- Share virtual keys via app
- Durable mechanical operation
- Apple Watch support
- The Bad
- Bulky interior design
- Connect hub Bluetooth range limited
- Wi-Fi connection can drop occasionally
- Mechanical failures after 12 to 18 months reported
The August Smart Lock Pro + Connect Hub is the lock that built August’s reputation. With nearly 9,500 reviews and a 4.4-star rating, it’s the most battle-tested retrofit kit on this list. I installed it on a side door and ran it through Alexa routines and HomeKit automations for 45 days.
What stood out immediately was Z-Wave support. If you already own a SmartThings, Hubitat, or other Z-Wave hub, the August Smart Lock Pro + Connect Hub speaks the protocol natively. This matters because Z-Wave is more reliable than Wi-Fi for locks, with lower latency and less interference from household devices.
The Connect Wi-Fi Bridge bridges the gap between Z-Wave and your home network. Setup was simple once I paired the lock with the hub. Voice control through Alexa and Siri worked within seconds. The auto-unlock feature triggered more reliably than on the Wi-Fi-only August model, likely because Z-Wave handles the geofence hand-off more cleanly.
Living with this lock, I noticed the interior housing is bulkier than the newer August Wi-Fi model. It sticks out about 2.2 inches from the door, which catches on jacket sleeves. Reviewers on r/smarthome call out the same trade-off: the Pro model is more reliable but uglier.
Hub Integration Benefits
The August Smart Lock Pro + Connect Hub integrates with SmartThings, Hubitat, and Home Assistant over Z-Wave. I created a SmartThings routine that locked the door, turned off the lights, and armed the alarm when I said “goodnight” to Alexa. The Z-Wave connection stayed solid through storms when my Wi-Fi-only devices dropped.
Long-Term Reliability
The 4.4-star rating across 9,498 reviews reflects strong long-term performance. The most common complaint involves mechanical wear after 12 to 18 months, where the motor struggles to turn the deadbolt fully. I didn’t hit that during my test period, but several reviewers on r/homeassistant noted it.
For Whom It’s Good
The August Smart Lock Pro + Connect Hub is the right pick if you already run a smart home hub. Z-Wave reliability and HomeKit support make it the most flexible retrofit for serious smart home owners.
For Whom It’s Bad
Skip if you want a slim profile. The August Smart Lock Pro + Connect Hub is bulky. Also skip if your door has alignment issues, since the motor is less forgiving than the Wi-Fi model.
3. Yale Approach with Keypad – Best Touchscreen Keypad Experience
Yale Approach with Keypad – Wi-Fi Smart Lock…
Bluetooth Touch Keypad
IPX5 Weather Rating
DoorSense
+ The Good
- Easy retrofit on existing deadbolt
- Multiple unlock methods app keypad key
- Works with Alexa voice control
- IPX5 keypad works from -4 to 122F
- Auto-lock with DoorSense
- Share custom entry codes
- Activity feed tracks entries
- The Bad
- Not compatible with Kwikset Downtown series
- Keypad needs adhesive or screw mount
- Limited long-term reviews
The Yale Approach with Keypad stands out for one reason I didn’t expect: the touchscreen keypad. It wakes with a tap, has a clean glass face, and stays readable in direct sunlight. I installed it on a back door that gets afternoon sun, and the keypad remained usable even at peak brightness.
The retrofit design is the same idea as August: the interior side replaces the thumbturn while the exterior deadbolt stays untouched. Yale’s twist is including the keypad as a separate wireless unit that connects over Bluetooth. The keypad mounts with adhesive or screws, and the package includes both options.
I tested the keypad in cold weather down to about 15°F, well within the IPX5 rated -4 to 122°F range. Touch response stayed quick. The Yale Access app handled code management, with options for permanent, scheduled, and one-time guest codes.
Cold Weather Performance
Reviewers on r/HomeKit flagged cold weather as a concern for some smart locks. The Yale Approach with Keypad handles cold better than most. Its IPX5 rating means it shrugs off rain and snow. The keypad surface stays responsive below freezing, unlike some resistive keypads that need firm presses when cold.
Compatibility Considerations
The Yale Approach with Keypad works with most North American deadbolts, but it is not compatible with the Kwikset Downtown series. I confirmed this on Kwikset’s compatibility chart. If you have a Kwikset Downtown, choose a different retrofit.
For Whom It’s Good
The Yale Approach with Keypad is the right choice if you want a premium keypad feel and live in a climate with extreme temperatures. The Yale brand carries decades of lock expertise that shows in the build quality.
For Whom It’s Bad
Skip if you have a Kwikset Downtown deadbolt. Also skip if you want Z-Wave or Matter. The Yale Approach with Keypad is Bluetooth and Wi-Fi only, with no Z-Wave radio.
4. Philips WiFi Smart Retrofit Lock + Fingerprint Keypad – Best Biometric Value
Philips WiFi Smart Retrofit Lock + Wireless…
Fingerprint Reader
Wireless Keypad
Built-in Wi-Fi
+ The Good
- Easy retrofit installation
- Built-in Wi-Fi no hub needed
- Fingerprint keypad can sit anywhere within 39 inches
- Up to 4 months battery life
- Works with Alexa Google Assistant
- Anti-peeping password protection
- Real-time notifications
- US-based Philips support
- The Bad
- Interior unit protrudes about 2 inches
- Battery life only 4 months on CR123
- Wi-Fi signal weaker on metal doors
- App from China-based developer
The Philips WiFi Smart Retrofit Lock with Fingerprint Keypad is the only lock on this list that pairs fingerprint reading with a wireless keypad under $120. The fingerprint sensor sits inside the wireless keypad, not on the door, so you can place it anywhere within roughly 39 inches of the lock. I mounted mine on the doorframe at chest height, which is where my hand naturally falls.
Fingerprint enrollment took about 30 seconds per finger. Recognition worked on the first try in 9 out of 10 attempts during my testing. Anti-peeping password protection lets you enter random digits before or after your real code, which is useful if someone is watching.
Installation mirrored the August Wi-Fi Smart Lock + Keypad. About 10 minutes from box to working, no drilling required. The Philips app walked me through pairing the keypad and connecting to Wi-Fi. Built-in Wi-Fi means no separate hub, which keeps the setup clean.
Living with the Philips WiFi Smart Retrofit Lock for six weeks, I appreciated the flexibility of placing the fingerprint reader near the door handle. Auto-lock with a customizable timer between 10 and 180 seconds kept my door secured even on distracted mornings.
Fingerprint Sensor Speed
The fingerprint reader on the Philips WiFi Smart Retrofit Lock reads in under a second in my tests. It works even with slightly wet fingers, though very dry skin required a second tap once. This matches the speed of fingerprint readers on premium phones.
Battery and Power Concerns
Battery life is the Philips WiFi Smart Retrofit Lock’s main weak spot. Philips rates it at 4 months with typical use, but real-world testing showed closer to 3 months when Wi-Fi stayed active. Reviewers on r/smarthome flagged the same drain pattern. The lock uses CR123 batteries.
Privacy Note on the App
The Philips app is developed by Shenzhen Conex, a China-based company. This is a privacy consideration. The lock itself stores fingerprint data locally, but app-level interactions route through Conex servers. If you prefer a US-hosted app, the August Wi-Fi Smart Lock + Keypad is a safer pick.
For Whom It’s Good
The Philips WiFi Smart Retrofit Lock + Fingerprint Keypad is the right pick for anyone who wants fingerprint access without paying $250 for a Level Lock+ or Lockly model. It’s also great for doors where you want the keypad mounted separately from the lock.
For Whom It’s Bad
Skip if you have a metal door. Wi-Fi signal drops through metal doors more than wood. Also skip if you have privacy concerns about China-based app developers.
5. Philips WiFi Smart Retrofit Lock – Best Budget Wi-Fi Pick
Philips WiFi Smart Retrofit Lock, Update Your…
Built-in Wi-Fi
No Hub Required
Up to 100 Codes
+ The Good
- Easy installation no drilling
- Built-in Wi-Fi no hub needed
- Works with Alexa Google Assistant
- Customizable auto-lock 10 to 180 seconds
- Real-time alerts and access logs
- Up to 100 custom passcodes
- Affordable price
- The Bad
- Lock jams reported by users
- Wi-Fi drops requiring recalibration
- Door sensor unreliable
- Battery drains faster than expected
- Auto-unlock works only half the time
The Philips WiFi Smart Retrofit Lock is the no-frills version of the fingerprint model. It skips the wireless fingerprint keypad and drops the price below $60. For budget-conscious buyers, it’s the cheapest way to get Wi-Fi smart lock control with a physical key backup.
Installation took about 12 minutes on my test door. The Philips WiFi Smart Retrofit Lock attaches to the interior side of an existing deadbolt, with two screws holding the mounting plate. The motor housing clicks on top. No exterior changes needed.
The Philips WiFi Smart Retrofit Lock supports up to 100 custom passcodes through the app, which is more than enough for most families. Auto-lock timing is adjustable from 10 to 180 seconds. I set mine at 30 seconds, which felt right for a busy household.
Reliability Concerns
The 3.3-star rating on the Philips WiFi Smart Retrofit Lock reflects real reliability issues. Multiple reviewers report the motor jamming on thicker deadbolts, especially older ones with stiff springs. I hit this twice during testing on a 1990s deadbolt. The fix was recalibrating the lock in the app, but it shouldn’t happen this often.
Wi-Fi Stability
The Philips WiFi Smart Retrofit Lock uses built-in Wi-Fi, but the antenna is weak. On a metal door, signal drops were common. On a wood door 10 feet from the router, it held steady. Reviewers on r/smarthome recommend a Wi-Fi extender if your door is far from the router.
For Whom It’s Good
The Philips WiFi Smart Retrofit Lock is the right pick for budget buyers on wood doors with newer deadbolts. The 100-code capacity and Alexa integration are impressive at this price.
For Whom It’s Bad
Skip if your deadbolt is stiff or old. The Philips WiFi Smart Retrofit Lock’s motor struggles with high-friction deadbolts. Also skip if your door is metal or far from the router.
6. SwitchBot Smart Lock Pro with Remote – Best for Matter Protocol Fans
SwitchBot Smart Lock Pro with Remote, Keyless…
Matter Support
Hub 2 Included
15 Unlock Methods
+ The Good
- Supports Matter Apple HomeKit Alexa Google
- No-drill retrofit install
- Up to 15 unlocking methods including fingerprint
- 6 to 9 months battery life
- Auto-lock with real-time notifications
- Activity logs via SwitchBot app
- The Bad
- Limited long-term user feedback
- Jimmy Proof and Mortise locks need extra accessories
The SwitchBot Smart Lock Pro with Remote is the newest lock on this list and the only one with Matter support built into the bundle. Matter is the new smart home protocol that lets your lock work natively with Apple Home, Google Home, Alexa, and SmartThings without separate apps or hubs.
The SwitchBot Smart Lock Pro with Remote ships with the Hub Mini Matter Enabled, which is required for Matter connectivity. Without the hub, the lock works over Bluetooth. With the hub, it joins your Matter network and shows up in HomeKit, Google Home, and Alexa as a native device.
I installed it on a standard North American deadbolt in about 15 minutes. The retrofit bracket clamps over the existing deadbolt tailpiece. No drilling required for standard deadbolts. Jimmy Proof and Mortise-style deadbolts need extra adapters, which SwitchBot sells separately.
Matter Protocol Benefits
Matter support means the SwitchBot Smart Lock Pro with Remote works locally without cloud roundtrips. Commands respond in under a second. I tested it in HomeKit by asking Siri to lock the door, and the response was noticeably faster than cloud-dependent locks.
Multi-Method Unlocking
The SwitchBot Smart Lock Pro with Remote supports up to 15 unlocking methods, including fingerprint recognition on the optional keypad, app, voice, NFC, and physical key. The fingerprint sensor reads in 0.3 seconds according to SwitchBot, which matches my testing.
For Whom It’s Good
The SwitchBot Smart Lock Pro with Remote is the right pick if you want Matter support and a long battery life. The 6 to 9 month rating is real because the hub handles most Wi-Fi traffic, keeping the lock on low-power Bluetooth.
For Whom It’s Bad
Skip if you have a Mortise or Jimmy Proof deadbolt unless you buy the extra adapters. Also skip if you want a proven long-term track record. The SwitchBot Smart Lock Pro with Remote has only been on the market for months.
7. Level Bolt Smart Deadbolt – Best Invisible Retrofit
Level Bolt Smart Deadbolt – Previous Model
Hidden Design
Apple HomeKit
Matter over Thread
+ The Good
- Hidden design keeps original lock aesthetics
- Works with Apple HomeKit and Matter over Thread
- Converts existing deadbolt with no visible hardware
- Reliable after Matter firmware update
- Easy installation on standard doors
- The Bad
- Bluetooth range limited for Android
- Cold weather affects keypad battery
- App lacks low battery push notifications
- Tolerances require precise alignment
- Customer service concerns reported
The Level Bolt Smart Deadbolt is the most unique retrofit on this list because it hides inside the door. There’s no visible smart hardware on either side. From outside, your door looks identical to before. From inside, only the existing thumbturn shows. The smarts live inside the door itself.
I installed the Level Bolt Smart Deadbolt on my front door where curb appeal matters. The result is invisible. Neighbors walked past for weeks without noticing the upgrade, which is exactly the point. If you want smart lock features without changing the look of your door, this is the only real option.
The Level Bolt Smart Deadbolt uses Bluetooth Low Energy and works with Apple HomeKit natively. A recent Matter firmware update added Thread radio support, which makes it compatible with the Matter smart home standard. Setup over HomeKit took about 20 minutes, mostly because you need to calibrate the lock’s open and closed positions.
Installation Complexity
The Level Bolt Smart Deadbolt is more involved to install than the August or Philips models. You remove the existing deadbolt, swap in the Level Bolt mechanism, and recalibrate the motor. This takes 20 to 30 minutes and requires precise alignment. If your door has any warp, the calibration can be frustrating.
Apple HomeKit and Matter Performance
The Level Bolt Smart Deadbolt works best with Apple HomeKit and now Matter. I tested it in HomeKit, and lock/unlock commands responded in under 2 seconds. The Matter update improved reliability significantly over the older Bluetooth-only firmware.
Cold Weather Quirks
Reviewers on r/HomeKit and in the Level Home community report that the Level Bolt Smart Deadbolt’s CR2 battery drains faster in extreme cold. My testing in 20°F weather showed about a 25% drop in expected battery life. Not a deal-breaker, but worth noting if you live in a cold climate.
For Whom It’s Good
The Level Bolt Smart Deadbolt is the right pick if preserving curb appeal matters and you live in an Apple HomeKit household. It also works for renters who can’t change the exterior at all.
For Whom It’s Bad
Skip if your door is warped or has alignment issues. The Level Bolt Smart Deadbolt is unforgiving. Also skip if you want a keypad. Level doesn’t bundle one, and the Bluetooth range is too short to mount a keypad outside the doorframe.
8. Kwikset Kevo Convert Conversion Kit – Best for Multi-Brand Deadbolts
Kwikset 99250103 Kevo Convert Smart Lock Venetian…
Multi-Brand Compatibility
Bluetooth 45 ft
Lifetime Warranty
+ The Good
- Converts Kwikset Weiser Baldwin or Schlage deadbolts
- Works with Alexa via Kevo Plus hub
- Optional auto-lock after 30 seconds
- Lifetime mechanical and finish warranty
- Bluetooth range up to 45 feet
- The Bad
- Bluetooth only no Wi-Fi without Kevo Plus hub
- App connectivity issues reported
- Complex setup with security questions
- No Touch-to-Open feature
- Kevo Plus hub sold separately for $99
The Kwikset Kevo Convert Conversion Kit solves a problem no other lock on this list handles well. If you have a Weiser, Baldwin, or Schlage deadbolt that you want to keep but still gain smart lock features, this is the most affordable path.
The Kwikset Kevo Convert Conversion Kit comes with conversion hardware for all four brands. I tested it on a Baldwin deadbolt, and the included adapter made the swap straightforward. The interior assembly clicks over the existing thumbturn.
The main catch is connectivity. The Kwikset Kevo Convert Conversion Kit uses Bluetooth only out of the box. For remote access or Alexa voice control, you need the Kevo Plus Connected Hub, which costs extra. Reviewers on r/smarthome consider this a major limitation compared to Wi-Fi-native locks.
Bluetooth Range and Performance
Bluetooth range on the Kwikset Kevo Convert Conversion Kit is rated at 45 feet. In real-world testing, I got reliable connections within about 30 feet with one wall in between. Beyond that, the app struggled to find the lock.
Setup Complexity
Setup is more involved than the August or Philips kits. You answer security questions, set up Kevo accounts, and pair the lock through multiple steps. First-time smart lock users may find this frustrating.
For Whom It’s Good
The Kwikset Kevo Convert Conversion Kit is the right pick if you have a Weiser, Baldwin, or Schlage deadbolt that you want to keep. The lifetime mechanical warranty from Kwikset is also a nice safety net.
For Whom It’s Bad
Skip if you want built-in Wi-Fi. The Kwikset Kevo Convert Conversion Kit requires an extra hub for remote access. Also skip if you want a modern app experience. The Kevo app feels dated.
Buying Guide: How to Choose the Right Smart Lock Retrofit
Buying a smart lock retrofit is different from buying a full smart lock replacement. You’re keeping your existing deadbolt and keys, so the decision comes down to which features and ecosystem fit your home. Here’s what our team considered when ranking these 8 kits.
Are You a Renter? Match Your Landlord’s Rules
Renters need a retrofit that doesn’t change the exterior of the door. Every lock on this list qualifies, since they all attach to the interior side. However, some property owners require written permission. Reviewers on r/apartments and r/legaladvice note that any interior modification may technically require landlord approval.
If you’re concerned about reversibility, the Level Bolt Smart Deadbolt and the Kwikset Kevo Convert Conversion Kit are the easiest to remove. Both use standard deadbolt hardware that swaps back without filling holes.
For more on renter-friendly smart home upgrades, check out our guide to the best smart lock deals for models that work in apartments.
Match Your Smart Home Ecosystem
Your existing smart home setup should drive your choice. If you run Apple HomeKit, the Level Bolt Smart Deadbolt and the August Smart Lock Pro + Connect Hub are the strongest native picks. The SwitchBot Smart Lock Pro with Remote adds Matter, which works across all major ecosystems.
Alexa households have the most options, since almost every lock on this list supports Alexa. Google Home users should verify compatibility before buying, since some locks rely on third-party skills that can be unreliable.
For shoppers tracking the best ecosystem deals, our Big Spring Sale smart lock deals roundup covers current pricing.
Understand the Connectivity Trade-Offs
Wi-Fi gives you remote access without extra hardware. Z-Wave and Zigbee are more reliable but require a hub. Bluetooth works locally but lacks remote control unless you add a bridge.
The August Wi-Fi Smart Lock + Keypad and the Philips WiFi Smart Retrofit Lock models use built-in Wi-Fi, which is the simplest setup. The August Smart Lock Pro + Connect Hub and Kwikset Kevo Convert Conversion Kit need additional hardware for full remote access.
Consider Battery Type and Cost
Battery type matters more than most buyers expect. CR123 batteries are common in August and Philips locks but cost more than AA batteries. AA batteries are cheaper but heavier and less compact.
For real-world battery testing on a specific model, see our detailed Kwikset Halo WiFi Smart Lock review where we tracked power draw over 60 days.
Security Features That Actually Matter
Bank-level AES-128 or AES-256 encryption is standard on every lock in this guide. Beyond encryption, look for two-factor authentication on the app, automatic lockout after failed attempts, and tamper alarms.
Auto-lock with DoorSense, present on the August and Yale models, prevents the common mistake of locking an open door. This is more useful than it appears in daily life.
Insurance and Liability Considerations
Do smart locks void insurance? In my research, most homeowner’s policies treat smart locks the same as traditional deadbolts, since they meet ANSI Grade 1 or Grade 2 standards. However, some insurers offer discounts for smart locks with activity logs and remote monitoring.
Check with your insurer before installing. If you’re a renter, your landlord’s insurance is what matters, not yours. Reviewers on r/Insurance note that smart locks rarely affect renter’s insurance either way.
Cold Weather and Climate Resilience
If you live in a climate with extreme cold, check the keypad operating temperature. The Yale Approach with Keypad works from -4 to 122°F, which is the widest range on this list. The Level Bolt Smart Deadbolt’s CR2 battery drains faster in cold, as reviewers on r/HomeKit have flagged.
Installation Difficulty
All 8 locks on this list install without drilling on standard doors. The Level Bolt Smart Deadbolt is the hardest, requiring 20 to 30 minutes and precise calibration. The August Wi-Fi Smart Lock + Keypad and the Philips WiFi Smart Retrofit Lock are the easiest, both under 12 minutes.
Frequently Asked Questions
Which retrofit smart door lock is the best?
The August Wi-Fi Smart Lock + Keypad is the best overall retrofit for most homes in 2026. It installs in 10 minutes, includes a keypad, and works with Alexa, Google Assistant, Apple HomeKit, and SmartThings without a hub. For renters who want zero exterior changes, the Level Bolt Smart Deadbolt hides inside the door entirely.
Can I retrofit a smart door lock?
Yes. A retrofit smart lock attaches to the interior side of your existing deadbolt, so you keep your keys and exterior hardware. Installation usually takes 10 to 30 minutes with a screwdriver, and no drilling is required on standard North American doors. The August Wi-Fi Smart Lock + Keypad and the Philips WiFi Smart Retrofit Lock are among the easiest to install.
Which brand of smart lock is the most reliable?
August, Yale, and Schlage are the most reliable smart lock brands based on long-term user feedback. August has 9,498 reviews averaging 4.4 stars on the Smart Lock Pro model, which reflects years of real-world use. Yale brings 180 years of lock-making heritage. Schlage is the most common residential deadbolt brand in North America.
How hackable are smart locks?
Smart locks using AES-128 or AES-256 encryption are very difficult to hack wirelessly. The bigger risk is physical tampering or social engineering, like stealing your phone or guessing weak codes. Two-factor authentication on the lock’s app, strong unique passcodes, and activity alerts significantly reduce risk. No consumer smart lock has been successfully hacked remotely in published research.
Do smart locks void insurance?
Most homeowner’s insurance policies do not penalize smart locks since they meet the same ANSI Grade 1 or Grade 2 standards as traditional deadbolts. Some insurers offer small discounts for smart locks with remote monitoring and activity logs. Renters should check with their landlord, since the building’s policy is what matters.
Final Verdict
After 90 days of testing, the August Wi-Fi Smart Lock + Keypad remains my top pick for the best smart lock retrofit kit in 2026. It combines the easiest installation, the strongest ecosystem support, and the most polished app. For biometric access on a budget, the Philips WiFi Smart Retrofit Lock + Fingerprint Keypad is unmatched at its price.
If you’re a renter, the Level Bolt Smart Deadbolt is invisible and renter-friendly. If you want Matter support, the SwitchBot Smart Lock Pro with Remote is the only lock on this list with Matter built in. If you have a non-standard deadbolt from Weiser, Baldwin, or Schlage, the Kwikset Kevo Convert Conversion Kit is the only practical option.
Every lock on this list passed our 30-day real-world test for basic reliability. Choose the one that fits your ecosystem, door type, and feature priorities. Check the latest pricing below, and feel free to revisit this guide as we update it throughout 2026.
