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cross section of a flush-casement window

Unlike the stormproof window, this style of casement is very much akin to the traditional old timber windows, and some producers call them "timber alternative". As the name suggests the casement finishes flush with the outside of the frame. However, they are still made from uPVC and most come with a woodgrain effect on the surface to replicate more authentically the old timber windows.


Modern manufacturing processes have enabled this type of window to perform much better than it's original forefather, with Qlon seals, multi-chamber extrusions and energy efficient glass! As a result there is now a great surge of interest, and the industry has pounced on the opportunity to fill the market with a great range of products.

Team Admiral strive to provide our customers with the best service possible. To ensure the best results, we only use high-quality products from trusted suppliers, which we carefully choose. We have worked in the fenestration industry for more than 35 years and have accumulated a vast amount of industry knowledge and experience, allowing us to offer our customers the best double glazing products on the market. To satisfy the demands and preferences of our customers, we have hand-picked the best options for the timeless elegance of flush casement.


As our default option for Flush Casement Windows, we are happy to recommend the Duraflex Flush Casement Windows. Duraflex are now the largest single-site extruder of hollow PVCu profile in the UK. They operate from purposely-built facilities, which include the office, factory, and warehouse, allowing them to complete the full cycle of window and door production from designing to manufacturing in one place, and to offer great value for money. The Duraflex Collection of Flush Casement Windows is amazingly versatile and will suit any type of property, from a traditional country house to an ultra-modern, contemporary accommodation.

Download the Duraflex Brochure
Duraflex Flush Windows Home Creations.jpg

Admiral Windows are proud to be the preferred installer of Timberlook Flush Sash Windows in Oxfordshire and beyond

The double glazing market is growing and changing at pace. Many other companies have entered the competition. We are very pleased to have found and offer our customers a rising star in the flush casement window market, the Timberlook Flush Sash Heritage Windows, which has already gained a well-earned reputation for quality and aesthetics.

We are happy to introduce the Timberlook Flush Sash Window System to our customers. Timberlook is a modern twist on a classic design. Their flush windows are an ideal solution for window replacement projects where the preservation of the authentic look of period buildings is required or desired. Also, these windows will perfectly suit contemporary buildings highlighting the beauty of modern, clean-line designs.

Timberlook Flush Sash uPVC Window Painswick Colour

Admiral Windows are delighted to be part of the Residence Collection preferred installer scheme, covering the Oxfordshire and beyond.

And the heavyweight and undeniable leader in the market, the company that is considered to be one of the original flush casement systems, The Residence Collection. Beautiful in every respect.

The market leader and way out in front in this industry, The Residence Collection, made up of R9, R7 and R2. Each one is slightly different in aesthetics and dimensions to cover all types of installation and specification requirements. 

Flush Casement Window in Chartwell Green Colour from Admiral Windows Oxford
Traditional butt joint flush casement window
Welded Joint Flush Casement Window

Authentic straight butt joints, or welded corners. This may not be a decision you thought you would need to make, but if price sensitivity and general overall look are more important than authenticity, then knowing that welded corners are less expensive than traditional butt joint construction may well be an important factor!

Our standard range of grained finish flush casement windows also come in a wide range of colours including the popular heritage colours such as Agate Grey, Elephant Grey and Chartwell Green.

upvc window samples in different colours
Flush Casement Window in Chartwell green colour in a house with black cladding
Flush Casement Corner Window in white colour
Flush Casement Window Double Coloured Frame
Flush Casement Window with monkey handles inside view
Flush casement window with two plants in pods
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