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Flush Casement Windows

Our Flush window is the latest exciting innovation from Duraflex, combining beautiful traditional timber aesthetics with the advanced security and thermal performance of PVCu - offering the very best of both worlds. Designed specifically to re-create the sought-after flush-fit look of traditional timber joinery, our flush window is available in both fully welded and mechanical joint options and is fully compatible with the current range of outerframe and transom combinations, offering complete system compatibility.

Delivering exceptional performance, the Duraflex flush window achieves BS6375-1 for Extreme Weather Performance, PAS24 and can achieve Secured by Design with both fully welded and mechanical sash options. In addition, the Flush window enables night-vent locking as standard, features Q-Lon – the world’s best weatherseal gasket, and thanks to it’s fully integrated design, it sits seamlessly within the Diamond Suite, alongside a single and double Flush door option and is further complimented by a Georgian bar collection, to enable authentic cottage window styles to be replicated. 

casement windows

Features & Benefits

Our flush 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 
  • Fully Welded and Mechanical Joint options
  • Secured by Design and Part Q specification available
  • Glazing options: 24, 28, 36 and 44mm 
  • U-values to 0.8W/(m2K)
  Download Flush 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."