Long lasting and virtually maintenance free, Permaframe’s casement windows will keep your home warmer, quieter and totally secure.

Our casement windows are double glazed and fully sealed, using the very latest glass technology to provide superior insulation giving you great energy efficiency in your home. Our A+ plus casement windows bring together a window frame with 5 insulating chambers, making them extremely tough and thermally efficient.

Grey Extreme UPVC Windows

The outermost frame of a window is the part which is mounted to the walls of your house and provides a fixing for the opening sashes to be fitted into. A window’s outer frames and sashes – often rectangular or square, but in some cases other shapes – are created from lengths of ‘profile’ which are designed to look good, perform excellently, and be easily installed into domestic properties.

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

Security is extremely important to get right when it comes to windows, which is why our EXTREME collection focuses on combining advanced security features and exceptional design. Each window has 11 visible locking points - that’s three times the protection of 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.
You can save on energy with modern windows…

For many households, the amount spent on heating costs is one of the biggest expenditures they face. However, you can reduce your reliance on expensive heating systems by replacing your outdated windows with our thermally efficient alternatives.

Once installed, heat will no longer be able to easily escape through the glass and frames of your windows and you will be able to enjoy a warmer and more comfortable home that’s cheaper to heat.

White UPVC Windows
Oak Envisage Flush Windows
White UPVC Windows


Once you’ve chosen your preferred window style, we can take you through the steps to customise the design. We’ll start with coloured finishes, then move on to glazing and hardware.

An outstanding range of colour finishes…

Find a classic or on-trend colour that works for you and your home. White windows always look timeless, but our UPVC can be finished in a variety of unique shades that will inject character into your home. Some of our up and coming colours and woodgrain finishes are proving to be popular with modern homeowners, including Chartwell green and Irish Oak. The opportunities to style your windows are endless!

Create the perfect balance of privacy and style…

The glass is such an integral part of your window to get right. Depending on your preferred visibility, the glazing on your Extreme windows can be chosen in privacy or clear. For certain rooms like bathrooms, many Permaframe customers opt for our privacy glazing which still invites maximum natural light inside.

Handles that perform as well as they look…

As a Permaframe customer, you have access to several traditional and contemporary handles for your Extreme UPVC windows.

In addition to their carefully crafted designs, our handles have a secure locking system built in, providing you with the ultimate defence in terms of security.


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Want to speak with an Advisor? Give us a call on 01373 794000

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


We invite you to join us at our showroom in Frome, to browse our many products in person and speak with our team of advisors and designers about your next home improvement project.