How to secure sash windows

Sash windows are a fantastic addition to any home. From new build homes to those fitting in with the style of period properties, sash windows add a timeless elegance and charm to any property.

As with any window, it’s important that your sash windows are secure to prevent intruders from gaining access to your property. Approximately 30% of all break-ins are said to occur via windows, which is why it’s vital to keep them in good repair and secure.

There are numerous ways and mechanisms available on the market – so which one is right for you? Our handy guide to how to secure sash windows will tell you everything you need to make an informed decision, keep your windows looking their best and keep intruders at bay.


Ensuring your sash windows are in good repair and good working order is your first step to keeping them secure.

Due to their construction, sash windows need regular maintenance to keep them at their best, although using stable, durable timbers such as Accoya, as we do for our timber windows and doors, will minimise the amount of maintenance that they need.

We have a comprehensive guide to cleaning and maintaining your timber windows and doors to help you keep them fitting and functioning well.

Check your windows regularly for any areas of damage or disrepair and ensure that any problems are remedied, replacing parts as necessary. With your windows in a good, usable condition, the following sections will guide you through options on how to further secure your sash windows.

Stop locks in Polished Chrome

Stop locks in polished chrome


Opening restrictors, or stop locks, serve a dual purpose in terms of both safety and security. These can be installed on your window to limit the size of the opening to a few inches, keeping uninvited visitors out and keeping those inside the building safe.

If children live at your property or regularly visit, or if you have pets, you may want to consider adding restrictors to prevent falls.

At Timbawood, all our sash windows come with stop locks as standard.

Forged Hook Sash Fastener in Oil Rubbed Bronze

Forged hook sash fastener in oil rubbed bronze

Sash window lock fasteners

There are a range of lockable sash window fasteners available to suit your needs and taste. These include Forged Hook, Brighton, Fitch, Reeded or Straight Arm fasteners, which come in a range of finishes. They all do the same essential job of locking your sash windows from the inside.

Whichever sash window lock fastener you choose, you’ll need to ensure that your window mechanism works smoothly and that your windows are fitted correctly and in good repair.

Beehive Sash Fastener in Polished Chrome

Beehive sash fastener in polished chrome

Reinforced security glass

One of the more rudimentary ways for unscrupulous operators to gain access to your premises is simply to smash the window. Whilst window catches and fasteners can help to prevent people simply climbing in, in the event of someone smashing the glass there’s little that can be done.

One way to mitigate this issue is to use laminated security glass. It is a more expensive option but it can significantly improve the security of your windows. Reinforced glass is laminated to make it tougher to break through, and is likely to deter would-be intruders if they are not able to gain quick access after an initial attempt.

What else can be done?

Whatever your window type, there are standard practices that should be adhered to deter burglars or intruders from trying to gain access to your home via your windows.

Curtains or blinds can be used to shield your property from view. If burglars have a clear view of an enticing steal from your property, they are more likely to act on it. If an iPad or laptop is left within striking distance and in clear view, it’s a green light for criminals.

Make sure your valuables are kept out of sight when not in use, and use your blinds or curtains to prevent a clear view inside your property when you’re not there.

Finally, make it part of your routine to ensure your windows are locked before leaving your property. It may seem obvious, but it’s worth checking that you have properly closed and secured each window. Just one window left unsecured could allow intruders into your property – and if you’ve failed to take adequate measures to secure your windows, your insurance policy may be affected.

Talk to the experts

The security of your property is paramount – and with Timbawood, you couldn’t be in safer hands. Our expert, experienced team is available to give you help and advice regarding an array of security measures for your sash windows, giving you the peace of mind that your property is safe and secure.

Contact us today to speak to one of our friendly team or take a look at our hardware page to see the range of window locks available from Timbawood.