At Deceuninck we provide stylish, customisable flush sash windows to homeowners in London and the rest of the UK. Unlike traditional timber windows, our flush sash windows can be crafted with narrow sightlines and a flush fit that blends into the existing style of a property almost perfectly. These thin sightlines provide you with better sightlines and more natural light.
All our products are subjected to in depth inspection and testing to ensure that they’re made from top-quality materials and provide unmatched functionality on top of amazing form. We pride ourselves on our keen detail and eye for quality, especially for our flush sash windows, so you can rely on Deceuninck to provide any London home with the best windows on the market.
Our modern windows give you the benefit of improved energy efficiency, weather-resistance, and industry-leading security features. Here at Deceuninck, we don’t sacrifice function for form, and you won’t have to make any compromises when choosing your flush sash windows. We care about providing high quality windows built to last and be eco-friendly, which is why we are #BestInClass. You can expect our flush sash windows to stay in good condition for years to come making them a worthwhile investment. Contact us today on 01249 816 969 to get started creating the dream installation for a London property.
Deceuninck has invested in a high-capacity PVC-U recycling line. We are capable of recycling four times as much material which ensures that all the material we use to produce our flush sash windows comes from sustainable sources. Plus, at the end of the flush sash windows life customers can have peace of mind knowing that they can be recycled into new products instead of ending up in a landfill.
We are capable of working with you to tailor your flush sash windows to suit your specific needs. Our wide range of colours and accessories can help you design the perfect aesthetic to match any London property. You can even choose from a selection of hardware options that have an expert blend of style and functionality. The glazing of your windows is even customisable with a broad range of types available to fit almost any home’s look.
Finish off the customisation of your flush sash windows with our selection of colourways and woodgrain foils. Choose from 30 colours that can easily be matched to any style, or follow the latest trends while keeping a classic aesthetic with our popular woodgrain foils like English Oak, Rosewood, and Golden Oak. Ask your local fabricator if you are in need of help maintaining a home’s traditional appearance.
Our flush sash windows are crafted from PVC-U instead of conventional materials like timber. PVC-U provides superb levels of insulation compared to timber allowing our flush sash windows to retain more heat, which can help reduce energy and heating costs. By choosing Deceuninck homeowners are making a worthwhile investment on their home.
Additionally, the PVC-U is much easier to maintain compared to timber profiles. There’s no concern for mould or warping, meaning the windows can last much longer while looking almost factory new for years to come. All it takes is an occasional wipe down with a sponge or cloth to clean them, and thanks to the windows not absorbing moisture they’re even easier to dry.
At Deceuninck we take the security our products provide seriously. All our flush sash windows have been designed and rigorously tested to have maximum protection against unwanted visitors. They each contain multi-point locking mechanisms as standard, and we also offer a range of glazing options should you require glass that is particularly robust.
If you’re looking to renovate a London property with improved security, contact our team today on 01249 816 969. We’d be pleased to answer any questions you may have about our locking mechanisms and other safety features.
Revamp the look of any London property with our flush sash windows. With a myriad of customisation options to ensure they fit your specific needs as well as high energy efficiency, industry-leading security, and weatherproofing, they are a perfect choice for any London homeowner.
If you would like to learn more about these windows or the services we offer, call us at 01249 816 969. Our expert staff members will be happy to answer any questions you may have and will help you with instructions on how to get started with your flush sash windows project.
We also have a handy locator tool so that you can find a fabricatorclose to you easily. We look forward to helping you transform homes with our flush sash windows.
Deceuninck’s Sustainability Considerations in Window Materials training course has been accredited by the Continuing Professional Development (CPD) Certification Service.
Elegant, Deceuninck’s ultra energy-efficient tilt-and-turn window, has been short-listed in the G-Awards New Product of the Year category 2025.
Darren Woodcock, General Manager, Deceuninck explains why in a period of significant change in the systems market, Deceuninck will continue to focus on its customers, not its competitors.
Deceuninck has been awarded its 14th consecutive RoSPA award in recognition of its commitment to maintaining high standards of health and safety across its operations.
