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Bay and Bow Windows

The casement window is the UK’s most popular window style and the Duraflex 70mm casement is available in 2 profile shapes - featured and bevelled - and can be used in a full range of window, door and conservatory configurations. This versatile window solution enables almost any casement window style to be achieved and works equally well in traditional cottages and contemporary new build homes. Featuring multi-chambered uPVC profile, which is designed to achieve the highest levels of thermal and security performance, the Duraflex casement window has been meticulously designed to ensure ease of fabrication and installation. Furthermore, all Duraflex window and door systems feature the world’s leading weatherseal gasket - Q-Lon, with lifetime guarantee; delivering exceptional thermal, acoustic and compression performance. 


A full range of ancillaries are available to enable an extensive range of window styles to be manufactured, including Mock Horn, French casements and a dedicated Georgian Bar Collection. The 70mm Casement Window can be internally or externally beaded and is fully integrated within the Duraflex Diamond Suite, ensuring a suited finish and seamless aesthetic to your project. 


bay windows


Features & Benefits

Our casement windows are more than just a beautifully designed product, they deliver exceptional performance for fabricators and homeowners alike.

  • 5 Chamber profile to enhance thermal performance 
  • Q-Lon Gasket supplied in all mainframe sections
  • Glazing options up to 44mm Triple Glazing
  • All sections available in Featured and Bevelled 
  • U-values to 0.8W/(m2K).
  Download Casement Window Data Sheet

Colour Options

The Duraflex Diamond Suite is available in an extensive range of foil finishes, from our authentic woodgrain effects such as Rosewood and Irish Oak, to contemporary solid colour finishes such as the popular Anthracite Grey and Chartwell Green; all designed to satisfy the most discerning homeowner.





Anthracite Smooth

Irish Oak

Golden Oak



Slate Grey Smooth

Black Brown

Anthracite Grey

Light Grey





Slate Grey

Agate Grey


"A proven partner to the UK's leading fabricators; proudly supplying retail, trade, commercial and new build markets for over 60 years."