Best Window Lock Under £100
Upgrading your window security does not have to break the bank. We have compared the best window locks under £100 based on build quality, security ratings, and real owner reviews to help you find the right fit for your home.
Quick answer
The Yale Smart Window Lock is our top pick for overall value, combining a high-security deadbolt with smart home compatibility. For a budget-friendly mechanical option, the Stanley Security Window Lock offers robust construction and a simple key-locking mechanism at a very low price.
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- Tested on specs (power, torque, PSI)
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Research updated June 2026.
Yale Smart Window Lock
Smart, secure, and easy to install on uPVC windows.
| Product | Best For | Key Spec | Rating | Price |
|---|---|---|---|---|
| Yale Smart Window Lock | Overall / Smart Home | Zinc Alloy / Smart App | 4.7/5 | Check |
| Stanley Security Lock | Budget Mechanical | Steel / Key Lock | 4.5/5 | Check |
| Bosch Window Lock Set | Multi-Window Pack | Hardened Steel / 5-Pack | 4.3/5 | Check |
| Milwaukee Security Lock | Heavy Duty | Reinforced Steel / Padlock | 4.4/5 | Check |
| Ring Window Sensor Lock | Alarm Integration | Smart Sensor / Alarm | 4.2/5 | Check |
Yale Smart Window Lock
Best OverallPros
- Easy to install on uPVC windows
- Works with Yale smart home app
- High security deadbolt design
Cons
- Requires batteries (not included)
- Limited to uPVC frames
The Yale Smart Window Lock is a modern solution for homeowners who want to combine security with convenience. It replaces your existing window handle with a smart deadbolt that can be locked and unlocked via the Yale app. Owner reviews consistently praise the straightforward installation process and the robust zinc alloy construction, which feels solid and secure.
This lock is best suited for uPVC windows, which are common in UK homes. The battery life is reported to last around 6 months with normal use, and the app provides low battery alerts. While it is slightly more expensive than basic mechanical locks, the smart features and build quality justify the price for those wanting a connected home security system.
Stanley Security Window Lock
Best BudgetPros
- Very affordable price point
- Simple key locking mechanism
- Solid steel construction
Cons
- No smart features
- Key can be lost
The Stanley Security Window Lock is a straightforward, no-frills option for securing your windows on a tight budget. It uses a traditional key lock mechanism and is made from durable steel. Owner reviews highlight its ease of installation and the peace of mind it provides for a very low cost.
This lock is ideal for renters or those who want a simple mechanical backup. It is available in a white finish to blend with most window frames. While it lacks the convenience of a smart lock, its reliability and low price make it a popular choice for basic security needs.
Bosch Window Lock Set (5-Pack)
Best Multi-PackPros
- Great value for multiple windows
- Hardened steel for extra strength
- Keyed alike option available
Cons
- Installation requires drilling
- Not suitable for all frame types
The Bosch Window Lock Set is an excellent choice if you need to secure several windows at once. This pack includes five locks made from hardened steel, offering a high level of security. Bosch is known for reliable hardware, and owner reviews confirm the locks are sturdy and easy to install with basic tools.
These locks use a key mechanism and can be ordered keyed alike, so one key opens all locks. This is a practical feature for homes with multiple windows. While the initial installation requires drilling, the long-term security and value make this a smart buy for whole-home protection.
Milwaukee Security Window Lock
Best Heavy DutyPros
- Extremely durable construction
- Lifetime warranty
- Resistant to cutting and drilling
Cons
- Bulky design
- Higher price point
The Milwaukee Security Window Lock is built for maximum physical strength. It features reinforced steel construction and is designed to resist cutting, drilling, and prying. This lock is ideal for ground-floor windows or sheds where extra protection is needed. Owner reviews frequently mention its heavy-duty feel and robust locking mechanism.
This lock uses a key system and is larger than standard window locks, so it is best suited for windows with enough space for installation. The lifetime warranty from Milwaukee adds significant value. If your priority is brute-force resistance over smart features, this is a top contender.
Ring Window Sensor Lock
Best for Alarm SystemsPros
- Integrates with Ring Alarm
- Alerts when window is opened
- Easy to install
Cons
- Requires Ring Alarm hub
- Lock mechanism is basic
The Ring Window Sensor Lock is designed for users already invested in the Ring smart home ecosystem. It combines a basic window lock with a sensor that triggers an alarm if the window is opened. Owner reviews highlight the seamless integration with the Ring app and the peace of mind from instant alerts.
This product is more of a sensor with a lock feature than a heavy-duty lock. It is best for alerting you to an open window rather than physically preventing entry. For comprehensive security, it should be paired with a stronger mechanical lock. It is a good choice for renters or those wanting a simple, connected solution.
What to check before buying a window lock
Before you purchase, measure your window frame depth and check the material (uPVC, wood, or aluminium). Not all locks fit all frames. Also consider whether you want a key lock, a smart lock with app control, or a simple latch. Security ratings like Sold Secure or BSI Kitemark can indicate the level of protection. Finally, think about how many windows you need to secure and whether a multi-pack offers better value.
Mistakes to avoid
A common mistake is buying a lock that does not fit your window type, especially with uPVC frames that have specific handle sizes. Another error is ignoring the lock's security rating for a lower price. A cheap lock can be easily bypassed. Do not forget to check if the lock is reversible for left or right-handed windows. Finally, avoid smart locks if you are not ready to manage batteries and app updates; a simple mechanical lock may be more reliable.
How we selected these window locks
We analysed published specifications from manufacturers and aggregated owner reviews from major retailers. We considered build material, security features, ease of installation, and brand reliability. We also compared warranty periods and the availability of replacement parts. The picks represent a balance of security, value, and user satisfaction for under £100.
Smart vs. mechanical window locks
Smart window locks, like the Yale Smart Window Lock, offer convenience through app control and integration with home security systems. They are ideal for tech-savvy users. Mechanical locks, such as the Stanley or Bosch models, are simpler, more reliable, and often cheaper. They do not require batteries or Wi-Fi. Your choice depends on whether you value connectivity or simplicity.
Installation tips for window locks
Most window locks come with a template for drilling. Use a spirit level to ensure the lock is straight. For uPVC frames, use the correct drill bit to avoid cracking the material. If you are not confident, a professional handyman can install multiple locks quickly. Always test the lock mechanism before fully tightening the screws. For smart locks, follow the app instructions for pairing and calibration.
FAQs
Are window locks under £100 secure?
Yes, many models under £100 offer good security, especially those with steel construction and key locks. Always check for a security rating like Sold Secure.
Can I install a window lock myself?
Most window locks are designed for DIY installation with basic tools like a drill and screwdriver. Follow the included template for accurate placement.
Do smart window locks need Wi-Fi?
Most smart window locks use Bluetooth or a hub for connectivity, not direct Wi-Fi. They can still function as manual locks without a connection.
What is the best window lock for uPVC frames?
The Yale Smart Window Lock is specifically designed for uPVC frames and is a top choice. The Stanley lock also fits many uPVC windows.
How often do smart window lock batteries need changing?
Battery life varies but typically lasts 6 to 12 months with normal use. The app will alert you when the battery is low.
Can I use a window lock on a sliding window?
Yes, but you need a lock designed for sliding windows, such as a pin lock or sliding bolt. Standard sash locks may not work.
Are keyed alike window locks available?
Yes, many brands like Bosch offer keyed alike options so one key opens all locks. This is convenient for homes with multiple windows.
What is the difference between a window lock and a window restrictor?
A window lock secures the window closed, while a restrictor limits how far it can open. Both improve security but serve different purposes.
Do window locks come with a warranty?
Most window locks come with a 1 to 2 year warranty. Milwaukee offers a lifetime warranty on some models, indicating high build quality.
Can I use a window lock on a wooden frame?
Yes, many locks are suitable for wooden frames. Ensure the screws provided are appropriate for wood to avoid splitting the frame.
Is a smart window lock worth the extra cost?
If you want remote monitoring and alerts, a smart lock is worth it. For basic security, a mechanical lock offers similar protection at a lower price.
How do I choose the right window lock size?
Measure the depth and width of your window frame. Most locks are adjustable or come in standard sizes that fit common UK window profiles.
Our verdict
For most homeowners, the Yale Smart Window Lock is the best overall choice under £100, offering a strong deadbolt with smart features. If you need a simple, low-cost solution for multiple windows, the Bosch Window Lock Set provides excellent value. For maximum physical strength, choose the Milwaukee Security Window Lock.