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Best Window Locks

Window locks are an essential component of home security. They not only deter burglars but also provide an extra layer of safety, especially in homes with young children. In 2023, we have seen a plethora of impressive window locks that have significantly enhanced home security. This article reviews some of the best window locks of the year.

Understanding the Importance of Window Locks

Windows are a common entry point for burglars. Unsecured windows can be easily opened, and even windows with basic latches may not provide enough deterrent against a determined intruder. Window locks provide an additional layer of security, making it harder for intruders to gain access and increasing the chances they'll be noticed.

Types of Window Locks

There are several types of window locks available, each with their own advantages and disadvantages.

  • Keyed Locks: Keyed locks are similar to traditional door locks, requiring a key to open or close. These are one of the most secure types of window locks, but they can be inconvenient, especially if you misplace the key.
  • Sash Locks: Sash locks are commonly used for double-hung windows. They secure the window by locking the sashes together, preventing them from being opened. Sash locks are easy to use and relatively secure, but they are not as secure as keyed locks.
  • Sliding Window Locks: Sliding window locks are designed for sliding windows. They lock the window in place, preventing it from being slid open. These locks are typically easy to install and use, but their level of security can vary.
  • Window Latch: A window latch is a simple, low-cost way to secure a window. The latch is fastened to the window frame and flips over the window sash to lock it in place. While a latch provides a basic level of security, it is generally not as secure as other types of window locks.
  • Window Bar: Window bars, or grilles, are a physical barrier that prevents the window from being opened from the outside. They are very secure but can detract from the aesthetic appeal of your home.

Factors to Consider When Buying Window Locks

When buying window locks, there are several factors to consider.

  • Type of Window: The type of window you have will largely determine the type of lock you need. For example, sliding windows will need a sliding window lock, while double-hung windows will need a sash lock.
  • Security Needs: Consider your security needs. If you live in a high-crime area or have had problems with break-ins in the past, you may want to opt for a more secure type of lock, like a keyed lock or window bars.
  • Ease of Use: The best window lock is one that you'll actually use. If a lock is too difficult or inconvenient to use, you may end up not using it, negating its security benefits.
  • Installation: Some window locks are easy to install yourself, while others may require professional installation. Consider your DIY skills and the potential cost of professional installation when choosing a lock.
  • Cost: Cost is always a factor to consider. More expensive locks tend to be more secure, but there are also many affordable locks that provide a good level of security.

Recommended Window Locks

Here are a few highly-rated window locks that you might consider:

1. Prime-Line U 9945 Window Lock

Prime-Line U 9945 Window Lock

The Prime-Line U 9945 window lock is a versatile option that fits on most sliding windows. It's a keyed lock, offering an additional layer of security. The lock is made from diecast construction and comes with a white paint finish, making it blend perfectly with your window decor.

The Prime-Line U 9945 stands out for its simplicity and effectiveness. Installation is straightforward, and it's robust enough to withstand forceful attempts at opening. The only drawback is that the key must be used to lock and unlock, which might not be convenient for all users.

2. Defender Security U 9809 Sliding Window Lock

Defender Security U 9809 Sliding Window Lock

The Defender Security U 9809 is a top-notch choice for those who prioritize easy installation. This lock clamps onto the window track with a simple thumbscrew, and no tools are required. Its design makes it compatible with most vertical or horizontal sliding windows.

The Defender Security U 9809 lock is made of extruded aluminum with a steel thumbscrew, ensuring maximum security. However, it's not a keyed lock, so while locking and unlocking is convenient, it may not offer the same security level as a keyed lock.

3. Maxdot Adjustable Sliding Window Lock

Maxdot Adjustable Sliding Window Lock

The Maxdot Adjustable Sliding Window Lock sets itself apart with its adjustable design. You can alter the size of the lock to fit windows of various sizes. The lock is made from aluminum alloy, offering strength and durability.

The Maxdot lock is easy to install, requiring no tools. It also includes a key, providing a higher level of security. Its adjustable nature makes it suitable for a wide range of windows, but it may not provide a perfect fit for all windows, potentially compromising its effectiveness.

4. Lion Locks Aluminum Sliding Door and Window Lock

Lion Locks Aluminum Sliding Door and Window Lock

The Lion Locks Aluminum Sliding Door and Window Lock is a versatile lock suitable for both sliding doors and windows. Made of aluminum, it's sturdy and durable. The lock features a double thumbscrew mechanism for added security.

The Lion Locks lock is easy to install and fits most windows and doors. It doesn't require a key, which adds to its convenience but reduces its security level. It's a good choice for those seeking a simple and versatile lock but may not meet the needs of those seeking maximum security.

5. CRANACH Swing Window Lock

CRANACH Swing Window Lock

The CRANACH Swing Window Lock is a solid choice for swing windows. It features a keyed lock and is made from solid zinc alloy, making it one of the most robust window locks. The lock is easy to install and comes with all necessary installation hardware.

The CRANACH lock provides excellent security for swing windows, a type of window often overlooked by other lock manufacturers. Its major downside is its specificity: it isn't suitable for sliding windows or doors.


In conclusion, the best window lock for you depends on the type of windows you have and your specific needs. If you prioritize keyed locks for maximum security, the Prime-Line U 9945 and the CRANACH Swing Window Lock are excellent choices. For easy installation and versatility, consider the Defender Security U 9809 or the Lion Locks Aluminum Sliding Door and Window Lock. If you require a lock that can adjust to fit different window sizes, the Maxdot Adjustable Sliding Window Lock is a good option.

Remember, while window locks can significantly enhance your home's security, they should be part of a comprehensive home security system. Other measures, such as alarm systems and security cameras, can further improve your home's safety.