Extra uPVC Door & Window Security: The Sash Jammer

You will no doubt have at least a couple of composite sash windows or uPVC doors on your property. Some houses consist mainly of uPVC windows and doors, front and back. The good thing about uPVC fixtures and fittings is that you can retrofit pretty much any security feature you want onto them. If you need a security upgrade, instead of replacing the whole door or window you can simply add uPVC hardware wether it’s a window restrictor, new multipoint door lock, or a sash jammer.

What is a Sash Jammer?

A sash jammer is a retrofit uPVC door and window security device. It can be called a window/door restrictor, window safety catch, uPVC door jammer etc. Simply put, it is an uncomplicated yet very effective security feature that can save your home from being burgled – as stated

Sash jammers are inexpensive which means you can fit as many as you want onto your uPVC windows and doors. The more you have the stronger the door or window.

We always advise to install the best 3 star euro cylinder locks on your doors and high quality locks and restrictors on your windows. For an added extra security feature though the sash jammer might just save you a lot of money in the long run.

While sash jammers offer excellent protection against opportunistic break-ins, they’re most effective when used alongside other proven security measures. Consider upgrading to multi-point locking mechanisms, installing anti-snap or anti-drill cylinders, and reinforcing hinge areas to eliminate potential weak points. Together, these enhancements create multiple barriers that significantly reduce the likelihood of forced entry. As Homebuilding & Renovating explains, combining sash jammers with smart security options — such as sensors, restrictors, and toughened glazing — is one of the most reliable ways to improve overall uPVC door and window security. The result? A safer home and valuable peace of mind.

Watch our sash jammer video below:

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Tags: Diy security, Door & window safety, Home security accessories, Sash jammer, Upvc security

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FAQ

What is a sash jammer and how does it improve UPVC window security?

A sash jammer is a small security device fitted to a UPVC window or door frame that prevents the sash from opening when locked. When engaged, the jammer blocks the window or door from being forced open, adding an extra physical barrier against intrusion. Many homeowners install sash jammers as an additional security measure because they are simple, affordable, and highly effective at reinforcing standard UPVC locking systems.

Improving window protection is often overlooked, even though windows can be just as vulnerable as doors. Our guide on Are Your Windows as Secure as Your Doors? explains why reinforcing window security can make a significant difference to overall home protection.

Are sash jammers suitable for UPVC doors as well as windows?

Yes, sash jammers can be installed on both UPVC windows and UPVC doors. They are commonly used on patio doors, French doors, and standard UPVC entrance doors to provide additional security. When fitted correctly, the jammer restricts the door from opening even if the main lock is compromised, making it much harder for intruders to force entry.

Do UPVC windows need additional security locks?

Most UPVC windows come with built-in locking systems, but additional security devices can help strengthen protection. Extra window locks or sash jammers act as a secondary barrier that can prevent forced entry if the main lock is tampered with. These upgrades are especially useful for ground-floor windows, older installations, or areas that may be more exposed.

What are the best ways to make a UPVC door more secure?

There are several ways to improve the security of a UPVC door. Installing additional security devices such as sash jammers or extra door locks can provide extra resistance against forced entry. Other improvements may include reinforcing hinges, ensuring the door frame is properly secured, and maintaining high-quality locking mechanisms. Even small upgrades can significantly increase overall door security.

Are window jammers effective for improving home security?

Window jammers are widely used as a simple but effective security upgrade for UPVC windows and doors. When engaged, the jammer stops the window or door from opening, which makes it much harder for intruders to gain access. Because they are affordable, easy to install, and visible from the outside, they provide both a physical security barrier and a useful deterrent.