Low maintenance and extremely durable, an Extreme UPVC window promises to deliver all on fronts and comes with a great guarantee.

We are pleased to exclusively offer homeowners across Berkshire, Hampshire & Surrey both the eco-friendly benefits and security of the new UPVC Extreme Windows. Thanks to the five unique selling points of Extreme Comfort, Extreme Style, Extreme Peace of Mind, Extreme Warranty and Extreme Security, the Extreme window range carries the Secure by Design badge as standard and provides both excellent protection and long-term confidence in your windows.

Extreme UPVC Windows

Extreme Windows surpass the high standard of thermal efficiency of the best A-rated windows, which make them one of the eco-friendliest windows available on the market now. Extreme Collection windows are backed by an incredible 20 Year Guarantee, that includes the genuine cover of all moving parts, as well as frames. Plus, the British-made Extreme Window offers homeowners a range of features not provided by any other system on the market.

Grey Extreme UPVC Windows
Extreme UPVC Windows


Do you want a true classic or would you prefer to break from the norm and go for something bold? All preferences are catered for due to the wealth of styles and colours we have.

Cream UPVC Cottage Windows


Casement windows have been eternally popular due to the practicability of this window style and the unfussiness of the design.

UPVC Tilt & Turn Windows


Tilt & Turn windows can be tilted from the top with a single turn of the handle, while a full handle turn will cause the window to completely open inwards.

UPVC Sash Windows


Offering a timber-inspired appearance, our sliding sash windows are built using a high-grade UPVC material, with the vertical opening giving you air flow options.

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.


Simply fill in your details for your free, no obligation quotation, and click "Get Quote"

Your details
What would you like a quote for?
Content Block
  • This field is for validation purposes and should be left unchanged.