Our flush sash windows feature a classic look, with an authentic timber feel that is created using innovative and intelligent design techniques. Unlike timber, our uPVC flush sash windows don’t suffer with fading, discolouration or deterioration over time, even after heavy and extensive use. Your home is open to the elements including heavy rain, snow and winds. You can be confident that our flush sash windows won’t deteriorate over time, with a long-lasting finish that retains its rich quality and texture years after being installed.

All of our weatherproof flush sash windows are available in our 26 colourways meaning that you can tailor them to suit your property and personal taste. Our colours won’t fade over time and remain bright and colourful year after year. There is no need for repainting or re-staining saving you time and money on upkeep too.

Our flush sash windows are able to withstand the extremes. From high heats to low temperatures, your windows won’t crack, warp or contract through the seasons. This makes them an attractive investment with a durable and resistant profile that is extremely high performance.

With sunlight coming through your windows and giving the illusion of more space, you might be concerned about your soft furnishings being damaged from the light over time. Our double glazing options can help avoid this with excellent protection and a high level of glass quality to help keep your interior protected.

Our flush sash windows seal the home against draughts, regulating the temperature in your home and keeping it consistently warm and comfortable. This helps reduce your reliance on the central heating and lower your energy costs, which makes our flush sash windows incredibly cost-effective. Your carbon footprint will also decrease, which means they make for an eco-friendly window choice.

Weatherproof Flush Sash Windows

Our Colour-Last Weatherproof Flush Sash Windows

Our flush sash windows are available in a number of stunning woodgrain effects which suit a range of property styles. You can confidently add our weatherproof flush sash windows to period and listed properties because of their discreet and traditional aesthetic that doesn’t tamper with original features, keeping a classic and timeless feel. The hardware is expertly concealed so that there are no unsightly corners on show, giving it a sleek and slim line appearance.

Adding flush sash windows to your home improved the amount of natural light that is able to enter your home, making a room feel larger and giving the illusion of more space. This brightens a room and developers a warm and welcoming atmosphere so that the need for artificial lighting is reduced. Add thermal efficient benefits as well as lowering your carbon footprint and you’ve got yourself a worthwhile investment that is extremely cost-effective.

At Deceuninck, we specialise in colour. That’s why we offer a vast range of colours in our Heritage Colour Collection with 26 colourways from stock so that you can create the ideal palette for your home. Our colours are hand-picked specially consisting of tones and shades that are inspired by nature. Featuring stunning shades such as Chartwell Green, Golden Oak, English Oak and Classic Cream. You can also opt for a dual colour solution with the insides of your frames in a different colour to the exterior.

With the popularity of adding a splash of colour to homes in the UK, and the use of colour already a firm favourite for property in continental Europe, it’s not hard to see why it’s a sought-after home improvement trend. You’ll be spoiled for choice with the number of colours available and with the ability to retain their rich and vibrant colour even after years of use.


Don’t worry about your flush sash windows being exposed to the elements and enjoy peace of mind that you’ve invested in a long-lasting product that will perform for years to come despite adverse weather conditions and high and low temperatures.

Durable Design

With a 10-year guarantee, you’ll have the peace of mind that your flush sash windows will last so that you can enjoy them year after year. Without any need to repaint, re-stain or spend time or money on upkeep, they make for a low maintenance option.

Stunning Aesthetics

Our weatherproof flush sash windows aren’t just high performance offering unrivalled functionality, they look beautiful and can enhance any home that they are added to. With slim sightlines and discreet hardware, you’ll be impressed with the finished result.


ISO 9001
BSI Kitemark
Glass & Glazing Federation
Secured By Design
PAS 24

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