Our casement windows are technically superior to so many other window styles.

Whether you are looking to maintain a traditional look or seeking something more contemporary, our large selection of casement windows will ensure you get exactly what you want. Our windows feature high-impact frames with fusion-welded joints and corners. This makes them robust and strong so they will last a lifetime. Special egress or escape hinges, where fitted to the side opening windows, allow them to be opened to a 90-degree angle, providing an exit facility in case of fire. We truly believe that casement windows are one of the best investments you can make for your home.

Grey Extreme UPVC Windows

Whether you are simply looking to replace your old inefficient windows or wanting to completely change where your windows are located or their size, we will take care of everything. We have over 20 years of experience helping local homeowners with replacement windows in Berkshire.

Grey UPVC Casement Windows
Extreme UPVC Windows
Do your windows have EXTREME protection?

Security is a big concern for homeowners, and we share that concern. That’s why we devised the EXTREME collection, an exclusive range that incorporates up to 11 visible locking points, giving you 3 times more protection than a 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.

Herculean Hinge

Heavy duty, highly engineered hinges that provide increased load bearing. With anti-crowbar technology and sustained use for a lifetime.

Extreme Locking

Up to 9-point locking system and two high compression hinge bolts to create 360-degree solidity. Also available with enhanced security option designed to meet the requirements of the police-recognised Secured by Design initiative.

Extreme Frame

Highly engineered frames, that encompass 14 chambers (combined sash and frame) to provide supreme thermal performance. Maximum protection against twist and ageing so your windows will look and operate like new for longer.

Extreme Weather Seal

Dual density and high elasticity for twice the standard coverage. Long lasting airtight protection from the elements and added noise reduction.

Ultimate Glass

High performance next generation glass for superb energy efficiency. Ultra-clear outer pane and a super soft coat inner pane. Improved clarity for the perfect view.

Extreme Handles

Our Extreme Handles come in a range of colours to suit your home. Built to last with robust materials and quality finishes.
What more could you want than an A+ rating?

All EXTREME windows from TradeMark are supplied A+ energy rated as standard, which ranks them amongst the very highest performing energy rated windows. They also offer a great standard of solar control and will sustain a comfortable internal temperature in all weathers.

Heat loss and leakages will be prevented, making your monthly energy bills far more manageable, and your home will feel significantly warmer.

White UPVC Windows
Oak Envisage Flush Windows
White UPVC Windows


Selecting a window style in just one step in the buying journey. You also need to customise the design, which will require you choosing a coloured finish, glass type and some appropriate door furniture.

Privacy isn’t compromised by style...

One of the most fundamental stages in the window buying process is selecting some glass for the design. The glass can have an overwhelming effect on how the window looks and how it performs. We have privacy glass, clear glass, and a host of other glasses. If you have any difficulty settling on a form of glazing, have a conversation with a TradeMark consultant who will suggest the best potential options.

Crafted with expert care…

You will look forward to operating your new windows as the traditional and contemporary-styled handles make it such a pleasure. Our craftspeople really have gone to town with them.
When the windows are locked, the secure locking system inside of the handles is what keeps them secure.


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