Smart locks have moved from luxury tech to practical home security, and August has been a major player since entering the market. The August Smart Door Lock retrofits onto most existing deadbolts, letting homeowners add keyless entry, remote access, and activity tracking without replacing the entire lockset. It’s a middle-ground option for those who want smart home integration without rekeying or swapping out exterior hardware. Installation takes about 10–15 minutes with a screwdriver, and the system works with voice assistants, security platforms, and smartphones. For DIYers weighing the jump to smart locks, August offers a low-commitment entry point with solid functionality.
Key Takeaways
- The August Smart Door Lock is a retrofit device that installs over your existing deadbolt in 10–15 minutes without requiring rekeying or exterior hardware replacement.
- Auto-Unlock proximity sensing, DoorSense door position detection, and guest access with activity logs make August ideal for renters, Airbnb hosts, and homeowners with smart home ecosystems.
- The 4th Gen Wi-Fi model includes built-in Wi-Fi and HomeKit support at around $230–$250, while older Pro models require a separate Connect hub for remote access.
- Existing keys remain functional even if the lock’s batteries die, and the August Smart Door Lock integrates seamlessly with Alexa, Google Assistant, Ring, and SimpliSafe.
- Battery replacement every 3–6 months, compatibility issues with non-standard deadbolts, and a sold-separately keypad accessory are drawbacks to consider before purchasing.
- August Smart Door Locks offer the best value for renters and homeowners prioritizing ease of installation and multi-platform smart home integration over hardwired reliability.
What Is the August Smart Door Lock and How Does It Work?
The August Smart Door Lock is a retrofit smart lock that mounts over the interior thumbturn of a standard deadbolt. Unlike full-replacement smart locks, it leaves the exterior keyed cylinder untouched, so existing keys still work. The device motorizes the interior lock mechanism and connects to a smartphone via Bluetooth or Wi-Fi (depending on the model and whether an August Connect hub is added).
When a user approaches the door with their phone, the Auto-Unlock feature can detect proximity and disengage the deadbolt automatically. Locking happens the same way when walking away, or users can tap the app or use voice commands through Amazon Alexa, Google Assistant, or Apple HomeKit (with compatible models).
The lock’s activity log records every lock and unlock event, noting which user or method triggered it, useful for tracking kids, contractors, or guests. August integrates with platforms like Ring, SimpliSafe, and Airbnb, expanding its utility beyond basic access control.
Power comes from two CR123 batteries housed in the interior assembly. Battery life ranges from 3–6 months depending on usage and connectivity. The system alerts users via the app when batteries run low, and the exterior keyhole remains functional even if batteries die.
Key Features That Set August Smart Locks Apart
DoorSense Technology is August’s built-in door position sensor, available on newer models. It tells the user whether the door is fully closed and locked, not just whether the deadbolt is engaged, a critical distinction if a door didn’t latch properly. The app will flag an open or ajar door, even if the lock shows as engaged.
Auto-Unlock and Auto-Lock use geofencing and Bluetooth to trigger the lock as the user approaches or leaves. Sensitivity and timing are adjustable in the app, which helps avoid false triggers. Some users disable Auto-Unlock for security reasons but keep Auto-Lock to ensure the door secures behind them.
Guest Access allows temporary or recurring virtual keys. Homeowners can grant access for specific dates and times, helpful for cleaners, dog walkers, or Airbnb guests. Access is revoked automatically when the window expires, and every entry is logged.
Voice Control works natively with Alexa and Google Assistant on most models. HomeKit compatibility requires the August Smart Lock Pro or newer. Voice commands can lock the door but typically require a PIN or confirmation to unlock, maintaining a security layer.
August Connect is a separate Wi-Fi bridge that plugs into an outlet near the lock. It enables remote control from anywhere, not just Bluetooth range. Without it, users can only control the lock when they’re within about 15–20 feet.
Installation and Setup: What to Expect
August markets the lock as a 10-minute DIY install, and for most standard deadbolts, that’s accurate. The only tool required is a Phillips-head screwdriver. The lock comes with multiple adapter caps to fit common deadbolt brands like Kwikset, Schlage, and Yale.
Installation steps:
- Remove the interior thumbturn and mounting plate from the existing deadbolt using the screwdriver.
- Select the correct adapter from the August kit and attach it to the deadbolt’s tailpiece (the metal spindle that connects both sides of the lock).
- Mount the August lock over the adapter, aligning it with the existing screw holes.
- Secure the lock with the provided screws and snap the faceplate into place.
- Insert batteries and follow the in-app calibration process, which teaches the lock the locked and unlocked positions.
Potential Issues:
If the deadbolt sits recessed or the door is unusually thick (more than 2 inches), the lock may not mount flush. August includes spacers for minor adjustments, but some vintage or commercial-grade locks won’t be compatible. The app has a compatibility checker that’s worth using before purchase.
The DoorSense sensor (if included) mounts to the doorframe with adhesive or a small screw. Placement matters, it needs to align precisely with the magnet on the door, or it won’t register door status correctly.
Setup through the August app is straightforward. The app walks users through pairing via Bluetooth, creating the first user profile, and setting preferences for Auto-Unlock and notifications. Adding the Connect hub requires a separate setup step but takes only a few minutes and a nearby outlet.
August Smart Lock Models: Which One Is Right for You?
As of 2026, August offers a streamlined lineup after consolidating older models. The main options are the August Wi-Fi Smart Lock (4th generation) and occasional availability of the Smart Lock Pro through retailers clearing inventory.
August Wi-Fi Smart Lock (4th Gen):
This is the current flagship. It has built-in Wi-Fi, eliminating the need for the separate Connect bridge. It includes DoorSense, works with Alexa and Google Assistant, and supports HomeKit. The design is smaller and less obtrusive than earlier models. Retail price typically hovers around $230–$250.
August Smart Lock Pro (3rd Gen):
The Pro requires the August Connect for remote access but is otherwise feature-complete. It supports all three voice platforms and includes DoorSense. Some users prefer the Pro because the Connect hub can be positioned for better Wi-Fi signal, whereas the built-in Wi-Fi model is limited by door location. Pricing varies: it’s often discounted below $200 when available.
Older Models:
Earlier August locks (1st and 2nd gen) lack DoorSense and may have limited app support as August phases out legacy firmware. They’re not worth buying new, even at deep discounts.
Choosing Between Them:
If the door is within strong Wi-Fi range and the user wants the simplest setup, the 4th Gen Wi-Fi model is the best pick. If the door is in a Wi-Fi dead zone or the user wants flexibility in hub placement, the Pro with Connect makes more sense, assuming it’s still in stock.
Pros and Cons of August Smart Door Locks
Pros:
- Non-destructive installation. No drilling, rekeying, or replacing the exterior lock. The process is reversible if the homeowner moves or wants to revert.
- Existing keys still work. Family members or housemates who don’t want to use the app can carry on as usual.
- Strong third-party integration. Works with Ring, SimpliSafe, Nest, and major voice assistants. Good for users already invested in a smart home ecosystem.
- Activity logs and guest access. Visibility into who’s coming and going, plus easy temporary access without cutting extra keys.
- DoorSense feature (on compatible models) catches doors left ajar, a real-world concern other smart locks sometimes miss.
Cons:
- Battery-powered only. No hardwired option. Users need to stay on top of battery replacements or risk getting locked out (though keys remain functional).
- Bluetooth range limitations without the Connect hub or built-in Wi-Fi. Remote control requires an extra purchase on older models.
- Compatibility issues with some deadbolt styles, particularly older Schlage, Emtek, or European locks. Not universally retrofit-friendly even though marketing claims.
- No built-in keypad. August sells a separate keypad accessory, but competitors like Schlage Encode include keypads in the base unit.
- App dependency. If the phone dies or Bluetooth acts up, users fall back on physical keys, which defeats some of the convenience.
Is the August Smart Door Lock Worth It?
For renters and homeowners who want smart lock features without replacing the entire lockset, August delivers solid value. The retrofit design is genuinely easy to install, and the ability to keep existing keys reduces friction with housemates or landlords. The 4th Gen Wi-Fi model is the most user-friendly, though the price point is higher than budget smart locks.
August makes the most sense for:
- Renters who can’t alter exterior hardware or don’t want to lose their security deposit.
- Homeowners already using smart home platforms like Alexa, Google Home, or HomeKit and wanting a lock that plays well with existing devices.
- Airbnb hosts or small landlords who need flexible guest access and detailed activity logs.
It’s less ideal for:
- Users who want a keypad for code entry without pulling out a phone. August’s keypad is sold separately and adds $60–$80 to the total cost.
- Homes with non-standard deadbolts or thick/recessed doors. Compatibility isn’t universal, and troubleshooting fit issues can be frustrating.
- Anyone seeking hardwired reliability. Battery changes every few months are manageable but not as seamless as wired alternatives.
Price-wise, August sits in the mid-range. Budget options exist under $100, but they sacrifice build quality and integration. Premium locks like the Yale Assure Lock 2 or Schlage Encode Plus cost more but include keypads and sometimes better battery life.
The real question is whether the retrofit design fits the user’s situation. If it does, August is hard to beat for ease and functionality.
Conclusion
August Smart Door Locks offer a practical entry into smart home security without the commitment of a full lock replacement. The retrofit installation, reliable app features, and strong third-party integrations make it a versatile choice for renters and homeowners alike. While it’s not perfect, battery dependency and occasional compatibility hiccups are real considerations, it strikes a balance between functionality and ease that few competitors match. For most standard residential deadbolts, August remains one of the smoothest paths to keyless, connected entry.
