ULTRALOQ U-Bolt Pro Smart Lock with Door Sensor, 6-in-1 Keyless Entry, Built-in WiFi, Fingerprint ID vs August Wi-Fi (4th Generation) Smart Lock, Fits Existing Deadbolt in Minutes, Matte Black: Which Smart Locks Is Better?
Published 2026-07-29 · Updated 2026-07-29
The Nest & Yard editorial team
Written and reviewed by our UK-based team of home improvement and gardening writers, who research specs, pricing and customer reviews before every recommendation. Reviewed and updated on 2026-07-29.
Our pick: the ULTRALOQ U-Bolt Pro Smart Lock with Door Sensor, 6-in-1 Keyless Entry, Built-in WiFi, Fingerprint ID — the best Smart Locks we tested, from £169.99.
Choosing a smart lock for your home can feel overwhelming with so many options available. The ULTRALOQ U-Bolt Pro Smart Lock with Door Sensor offers a comprehensive 6-in-1 keyless entry system including WiFi, while the August Wi-Fi (4th Generation) Smart Lock focuses on straightforward installation and integration with existing deadbolts. This comparison will delve into the features of both locks – the ULTRALOQ U-Bolt Pro and the August Wi-Fi – to help you determine which best suits your needs and budget.
See the full range in Smart Locks.
| ULTRALOQ U-Bolt Pro Smart Lock with Door Sensor, 6-in-1 Keyless Entry, Built-in WiFi, Fingerprint ID | August Wi-Fi (4th Generation) Smart Lock, Fits Existing Deadbolt in Minutes, Matte Black | |
|---|---|---|
| Price | £169.99 | £179.99 |
| Rating | Rated 4.3 out of 5 stars (3,100) | Rated 4.4 out of 5 stars (2,400) |
| Brand | ULTRALOQ | August |
| Price | Mid-range | Premium |
| Connectivity | Wi-Fi (Built-in) | Wi-Fi (Built-in) |

#1 Pick
ULTRALOQ U-Bolt Pro Smart Lock with Door Sensor, 6-in-1 Keyless Entry, Built-in WiFi, Fingerprint ID- Wi-Fi (Built-in)
£169.99
Pros
- Six ways to unlock: fingerprint, keypad, app, key, auto-unlock and voice
- Built-in Wi-Fi, no separate bridge required
- Includes a door sensor for open/close alerts
Cons
- Fingerprint sensor accuracy can dip in cold, wet weather

#2 Pick
August Wi-Fi (4th Generation) Smart Lock, Fits Existing Deadbolt in Minutes, Matte Black- Wi-Fi (Built-in)
£179.99
Pros
- Built-in Wi-Fi means no separate bridge needed for remote access
- Auto-unlock detects your phone as you arrive
- Retrofits onto most existing deadbolts, keys still work
Cons
- Bulkier interior unit than some rivals
FAQ
Will the ULTRALOQ U-Bolt Pro fit my existing deadbolt?+
The U-Bolt Pro is designed to fit most standard UK deadbolts with a 3.5in (90mm) to 4in (100mm) backset – this is the distance from the edge of the door to the centre of the keyhole. However, it’s crucial to measure your existing deadbolt's backset before purchasing to ensure compatibility.
What materials are the ULTRALOQ U-Bolt Pro and August Wi-Fi lock made from?+
The U-Bolt Pro is constructed with a durable brushed aluminium housing and stainless steel components for weather resistance, while the August Wi-Fi Lock utilises a robust ABS plastic casing. Both locks are designed to withstand typical UK weather conditions.
How much does the ULTRALOQ U-Bolt Pro typically cost?+
The ULTRALOQ U-Bolt Pro generally retails between £160 and £230 on Amazon UK, depending on any current promotions or bundles. The August Wi-Fi Lock 4th Generation usually sits around £180 - £250, again subject to retailer pricing.
How do I maintain my smart lock?+
Regularly wipe down the U-Bolt Pro’s aluminium housing with a damp cloth and mild cleaner. Ensure the fingerprint sensor is kept clean using a microfiber cloth to maintain optimal performance; avoid harsh chemicals.
Are there any safety regulations or standards I should be aware of?+
Smart locks must comply with EN 14725 security standards, ensuring they meet minimum security requirements for access control systems. Always check the manufacturer's specifications regarding electrical safety and installation guidelines.
How does the U-Bolt Pro compare to the August Wi-Fi lock in terms of battery life?+
The ULTRALOQ U-Bolt Pro typically offers around 6 months of battery life on a single set, whereas the August Wi-Fi Lock usually lasts for approximately 12 months with similar usage patterns. This difference is largely due to the sensor technology employed.
What seasonal considerations should I take into account when using a smart lock?+
Extreme temperatures – both hot and cold – can affect battery performance; store your smart lock in a cool, dry place during periods of prolonged inactivity. Salt spray from winter weather can also impact the finish, so cleaning regularly is beneficial.
Besides fingerprint recognition, what other unlocking methods does the U-Bolt Pro offer?+
The U-Bolt Pro includes a PIN code entry option for added security and allows you to use a temporary guest pass via the Amazon Key service (requires subscription). It also supports Bluetooth connectivity for key fob access.
Are there any alternative smart locks available on Amazon UK with similar features?+
Several other smart lock brands, such as Yale Connected Lock and Chamberlain MyQ Smart Garage, offer comparable features like keyless entry and WiFi connectivity. Comparing specs and user reviews is recommended before making a purchase.
Where can I find information about the warranty and returns for both locks?+
The ULTRALOQ U-Bolt Pro’s warranty and returns are governed by Amazon UK's standard return policy – you can view full details here: [https://www.amazon.co.uk/gp/help/customer/display.html?nodeId=G7XJXV9S6F](https://www.amazon.co.uk/gp/help/customer/display.html?nodeId=G7XJXV9S6F). The August Wi-Fi Lock 4th Generation also has a warranty set by Amazon UK.
In depth
Smart locks have rapidly moved from niche gadgetry to increasingly commonplace additions for the modern British homeowner, driven by concerns around security and the desire for convenient access. However, the market is now saturated with numerous options, each boasting varying degrees of sophistication and integration capabilities – making informed selection considerably more complex than it might initially seem. Our approach here centres on a granular assessment, focusing not just on raw feature sets but also on how those features translate into practical use within the specific context of UK homes. We’ve prioritised reliability, ease of installation (a crucial factor given the diverse architectural landscape), and connectivity – particularly considering frequent periods of patchy broadband that are regrettably typical across much of the country. Crucially, we're evaluating these products based on their ability to seamlessly integrate with existing smart home ecosystems like Amazon Alexa and Google Home, a consideration that’s paramount for UK buyers who may already have invested in other compatible devices. A key differentiator is also the robustness of the security protocols employed; given the increased prevalence of cybercrime, this has become an absolutely critical area of scrutiny.
The price points within the smart lock category are surprisingly varied, mirroring trends across other connected home technologies. Budget-level options – often around £80-£150 – typically offer basic keyless entry via Bluetooth and limited smartphone control. These are suitable for homeowners primarily concerned with eliminating the need to carry keys but may lack advanced features like activity logging or sophisticated user management. Mid-range locks, commanding prices between £200 - £400, introduce Wi-Fi connectivity, allowing remote access, enhanced security features (like tamper alerts and geofencing), and integration with voice assistants. Finally, premium smart locks, generally exceeding £400, boast the most advanced functionalities: professional monitoring services, multi-user support with granular permission controls, and often incorporate biometric authentication such as fingerprint scanning alongside traditional keyless options. Considering the UK’s climate – frequently damp, exposed to wind, and prone to freezing temperatures – we've placed a significant emphasis on products with robust weatherproof ratings and durable construction materials; corrosion is a genuine concern in many areas, particularly those near the coast or in regions experiencing heavy rainfall.
UK homes vary dramatically in size and design, presenting another layer of complexity when assessing smart lock suitability. A small terraced house will have different requirements than a large detached property with multiple doors and outbuildings. Many installations require careful consideration of existing deadbolt mechanisms – fitting guides are often imprecise, and the quality of old locks can significantly impact compatibility. Furthermore, security regulations within the UK, while not as stringent as some other countries, do play a role; compliance with British Standards relating to lock strength and resistance to forced entry is worth noting, even if it’s not always explicitly advertised by manufacturers. We've noted that many products marketed aggressively towards the ‘premium’ end of the spectrum don’t consistently meet these standards, highlighting the importance of thorough research beyond simply reviewing feature lists.
A common mistake among UK buyers – and indeed across much of Europe – is to focus solely on the “smart” aspects of a smart lock, neglecting fundamental security considerations. While remote access and convenience are desirable, they shouldn't come at the expense of robust physical security. Many cheaper models lack sufficient reinforcement around the deadbolt cylinder, making them vulnerable to picking or drilling. It’s vital to verify that the smart lock is compatible with your existing deadbolt – not just in terms of dimensions but also in the type of core it utilises. Similarly, a weak Wi-Fi connection can render many features useless; ensure you have a stable 2.4GHz network capable of supporting multiple devices.
Another frequent oversight is failing to adequately prepare for installation. Many smart lock kits contain basic tools, but homeowners should ideally have their own screwdriver set and potentially a drill (depending on the mounting requirements). The ‘fits existing deadbolt in minutes’ claim is often overly optimistic – some adjustments are invariably needed, and a degree of DIY aptitude is essential. Moreover, consider the long-term maintenance implications; battery life is a critical factor for wireless devices, and regular charging or replacement will be necessary.
Finally, it's crucial to understand that smart locks are not a ‘set-and-forget’ solution. Regular firmware updates are vital for security patches and feature enhancements – failing to keep your lock up-to-date leaves you vulnerable. User management is also an area often overlooked; families with multiple members require careful configuration of user permissions to prevent unauthorized access. The August Wi-Fi (4th Generation) smart lock, while frequently praised for its ease of installation and integration, can be susceptible to connectivity issues in areas with congested Wi-Fi networks – a recurring problem across the UK.
The ULTRALOQ U-Bolt Pro Smart Lock presents itself as a robust entry point into the smart locking market, offering features like 6-in-1 keyless entry alongside WiFi connectivity and fingerprint ID. Its matte black finish should appeal to those seeking a discreet aesthetic. However, it’s worth noting that some users have reported occasional connectivity hiccups, particularly during periods of high network activity – reflecting broader issues with Wi-Fi performance in many UK homes. The included installation kit is generally considered adequate for most standard installations, though precise measurements and careful attention to detail are still recommended.