August Smart Door Sensor Review
The August Smart Door Sensor is a compact, battery-powered accessory designed to integrate with August Smart Locks, providing real-time door open/close status and enhancing your home security automation. This review examines its specifications, reliability, and overall value based on published specs and aggregated owner feedback.
August Smart Door Sensor
Reliable door status detection and seamless integration with August locks.
Quick answer
The August Smart Door Sensor is the best accessory for anyone already using an August Smart Lock. It provides reliable open/close detection, enables auto-lock and auto-unlock features, and integrates smoothly with the August app and smart home platforms like Alexa and Google Assistant.
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Research updated June 2026.
Pros
- Simple installation with adhesive backing
- Enables auto-lock and auto-unlock features
- Long battery life reported by owners
- Compact and unobtrusive design
- Works with Door Sense for activity alerts
Cons
- Requires an August Smart Lock to function
- Bluetooth range can be limited in larger homes
- No native HomeKit support without August bridge
- Adhesive may weaken over time on textured surfaces
Who is the August Smart Door Sensor for?
This sensor is designed specifically for existing August Smart Lock owners who want to add door status monitoring. It is ideal for users who frequently forget to lock their door, as it enables the auto-lock feature that secures the door after a set time once it closes. It also enhances the auto-unlock feature by ensuring the lock only opens when the door is actually closed, improving security.
For renters or homeowners who already have an August lock, this sensor is a logical and affordable upgrade. It is not a standalone product and offers no value without a compatible August Smart Lock (Wi-Fi, Pro, or 4th Gen models).
Performance and Reliability
Based on aggregated owner reviews from major retailers, the August Smart Door Sensor performs its core function reliably. Users report that the sensor accurately detects when the door is open or closed, with very few false readings. The Bluetooth connection to the August lock is stable within the specified 30-foot range, though some owners note that walls and metal doors can reduce effective range.
Battery life is a strong point, with many users reporting 12-18 months of use before needing a replacement CR2032 battery. The sensor communicates status changes to the lock, which then relays the information to the August app via Wi-Fi (if using a Wi-Fi or Pro model). This allows for real-time notifications and activity logs. However, without the August Connect bridge, the sensor relies on the lock's Bluetooth range for communication, which can be a limitation in larger properties.
Build Quality and Installation
The sensor is constructed from white plastic with a low-profile design. It consists of two parts: a larger main unit and a smaller magnet that attaches to the door. Installation is straightforward, requiring only the included 3M adhesive backing. Users simply clean the door and frame, peel, and stick. Most owners report the adhesive holds well on smooth surfaces, but some recommend using additional mounting tape for textured or painted surfaces.
The sensor is not weatherproof and is designed for interior use only. The build quality is adequate for the price point, though it feels less premium than the August locks themselves. The warranty is one year, which is standard for accessories of this type.
Alternatives to Consider
If you do not own an August Smart Lock, this sensor is not for you. For users with other smart lock ecosystems, alternatives include the Ring Alarm Contact Sensor (for Ring users) or the Yale Smart Sensor (for Yale locks). These offer similar functionality but are tied to their respective brands.
For those who want door sensing without a smart lock, standalone sensors like the Aqara Door and Window Sensor (requires a hub) or the Samsung SmartThings Sensor offer broader compatibility with smart home platforms. However, they lack the deep integration with August's auto-lock and auto-unlock features.
FAQs
Can the August Smart Door Sensor work without an August lock?
No, the sensor only communicates with an August Smart Lock and provides no functionality on its own.
Does the sensor work with HomeKit?
It works with HomeKit indirectly through a compatible August Smart Lock, but requires the August Connect Wi-Fi bridge for full integration.
How long does the battery last?
Most users report 12-18 months of battery life, though August claims up to 2 years under normal use.
Is the sensor waterproof?
No, it is designed for indoor use only and should not be exposed to moisture.
Can I use multiple sensors with one August lock?
Yes, you can pair multiple sensors to a single lock to monitor multiple doors or windows.
Does the sensor support auto-lock?
Yes, when paired with an August lock, the sensor enables the auto-lock feature that locks the door after it closes.
What is the Bluetooth range?
The sensor communicates with the lock within a range of up to 30 feet, but walls can reduce this distance.
How do I install the sensor?
Clean the door and frame, remove the adhesive backing, and press the sensor and magnet into place. No tools required.
Can the sensor be used on metal doors?
Yes, but the adhesive may not hold as well. Use additional mounting tape for a secure fit.
Does it work with Alexa or Google Assistant?
Yes, through the August lock and app, you can receive door status alerts via Alexa and Google Assistant.
Our verdict
The August Smart Door Sensor is a must-have accessory for August Smart Lock owners, offering reliable door status detection and enabling key automation features. It is the best overall choice for enhancing your August ecosystem. For those without an August lock, consider a standalone contact sensor from Aqara or Ring instead.