Sliding sash windows are a timeless favourite…

Sash windows are perhaps the most common type of window found here in and around Berkshire, Hampshire & Surrey. First introduced in the late 17th century, they remained popular across the Georgian, Victorian, and Edwardian eras, as such they can be found in many different styles of home right across the country.
Perhaps the most notable feature of Sash Windows is how they open and close. They feature two panes of glass positioned in vertical grooves that slide up and down: one in front and one behind.

UPVC Sash Windows

The grid style design of Sash Windows makes them instantly recognisable. Consisting of a grid of small glass panes held together by bars, the number of panes is often varied and therefore ensures your choice of window is unique. ‘Six over six’ and ‘eight over eight’ patterns are associated with Georgian-style homes, while a ‘two over two’ pattern is more common in Victorian era houses.

UPVC Sash Windows
UPVC Sash Windows
Do your sash windows have EXTREME protection?

Security is a top priority of ours as want our customer’s homes to be safe places to live. Every EXTREME sliding sash window has up to 11 visible locking points, giving your home 3 times more protection than a traditional standard window. 

  • EXTREME enhanced security with centre VAULTBOLT and multi cam locking technology.
  • EXTREME enhanced durability with UNIQUE superglide gearbox ensures smooth operation.
  • EXTREME enhanced COMPRESSION and acoustics with interlocking hinge bolts and optimum weatherseals.

Sliding Sash Frame

Available in welded joints with 45-degree corner welds for a smooth, sleeker finish and mechanical joints to take the design to another level, the 90-degree welds give a more traditional sash window finish.

Ultimate Glass

High performance next generation glass for superb energy efficiency. With acoustic glass to block out the sound of a bust neighbourhood, or patterned privacy glass for a bathroom, we’ll have the perfect solution for you.

Sliding Sash Locking

Secured using a snail cam that is fitted to the top face of the sash. By turning the lever, the cam is released from its keep, giving you the option of either a key-locking or non-locking system.

Sliding Sash Handles

Our handles come in a range of colours to suit your home, they’re built to last with robust materials and quality finishes.

Weather Proofing

Wool pipe strips that provide an excellent layer of defence against the elements. Available with colour-matching wool pile to ensure that every detail of you window matches perfectly.

Versatile Design

As standard, our Sliding Sash Window also comes with a slide and tilt facility, allowing you to clean both the top and bottom sash from inside your home.
Bring those energy bills right down in cost…

Like so many people, your energy bills may have dramatically increased in recent times. Some of that could be down to the inability of your existing windows to retain heat. New replacement windows from TradeMark will help.

Heat loss will be eliminated for good, with the windows keeping the warmth that comes out of your boiler firmly trapped inside. Your energy bills will become so much more affordable.

White UPVC Windows
Oak Envisage Flush Windows
White UPVC Windows


We allow our customers to personalise their windows in a manner that suits them. You will be advised of all the potential-coloured finishes, glazing and hardware options that we have.

We’re generous with our glazing options…

The UPVC profile that make up our sash window designs needs to be filled with glass, and TradeMark offers a welcome selection of glazing, including privacy glass and energy rated glass. The latter will, not surprisingly, provide a high standard of thermal efficiency, and subsequently, reduce your energy costs. Energy Rated windows can take leaded glass and astragal bars.

Immaculately crafted designs…

The handles affixed to our sliding sash windows have been carefully made by our very talented craftspeople. We can offer an array of traditional and contemporary-styled handles.

When locked, the windows stay locked as there is a secure locking system inside the handle that you can rely on.


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Want to speak with an Advisor? Give us a call on 0800 30 50 30

Our friendly team will be pleased to help with any questions you may have.


Join us at our showroom in Woodley in the suburbs of Reading, to browse our products in person and speak with our team of advisors and designers about your next home improvement project.