Accoya Sash Windows
Classic look, contemporary performanceExpertly designed and hand crafted by some of the UK’s finest joiners Accoya has now become the number one choice for timber sash windows in the UK.
Easy to work with, Accoya is ideal for both traditional and contemporary joinery. As a homeowner you can take your pick from a range of bespoke factory finishes, and thanks to Accoya’s stability, your chosen coatings keep your sash windows looking pristine for longer.
Low maintenance
Save time and money by choosing Accoya for your sash windows made by joiners all over the UK.
Highly stable
Your sash windows will continue to open effortlessly in all seasons and for years to come.
Warranty
Accoya wood warranty giving you peace of mind that your sash windows are a worthwhile lifetime investment.
Non toxic
Accoya is natural wood, and so your Accoya sash windows are not harmful to the environment. Ideal for your home and the planet.
case study
New double glazed timber sash windows
This property in Wiltshire was upgraded with new double glazed Accoya sashes installed into the existing window frames.
The homeowner wanted to upgrade their windows, which were cold and draughty. Accoya was chosen due to it being long lasting, with an anti-rot guarantee and requiring low maintenance. The new windows were manufactured and installed by approved manufacturers The Sash Window Workshop. Before installation, the windows were also factory coated using PPG coating in white to match the existing frames.
In total, 16 windows had new sashes installed into existing window frames with antique brass ironmongery.
Coatings & Finishes
A fully factory coating is strongly recommended for Accoya sash windows. A variety of colours and finishes have been tested by leading coating manufacturers with outstanding results. Some examples can be seen below but the possibilities are endless.
UK tried and tested
Over the past two decades, Accoya wood has been tested extensively by accredited bodies. Their reports showcase the excellent performance and outstanding benefits of Accoya wood and, in particular, Accoya wooden windows.
For more information and to see the testing reports, head to our windows page.
Case Study
New wooden sash windows to improve family home
When Joe and Helen purchased their first family home in Southwest London they were sure of one thing, the whole property needed to undergo a major upgrade. Whilst they had big plans to extend the 3-story home and completely refurbish the property before they moved in, they also knew this was the only opportunity to replace the original rotting sash windows too.
After a huge amount of research online and visiting local joinery showrooms they opted for Accoya. It was recommended to them by friends and also the London joinery company they picked – London Box Sash. It was the most high-performance timber for the window frames and was sustainable too. The couple had faith in London Box Sash as they had been using Accoya for over 10 years and were well trained and knowledgeable about Accoya. The icing on the cake was that the Accoya window frames came with a 50-year warranty – not offered on any other wood. This gave confidence to the couple who decided Accoya windows were going to tick all the boxes.
“We couldn’t be more delighted with our new windows – they look fantastic! And most of all, there are no drafts to contend with anymore. Thank you to the team at London Box Sash for the great service you provided and of course for our Accoya windows!”
Accoya sash window projects
Sash Window FAQs
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Accoya sash windows combine a classic style with modern performance. Unlike traditional timbers, Accoya doesn’t warp, swell, or rot, making it perfect for sliding sash frames that require smooth operation. It also offers excellent insulation, helping reduce heating bills while maintaining the charm of traditional timber window frames.
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No. Thanks to the acetylation process, Accoya absorbs very little moisture, meaning it remains stable in all climates. Even in damp and humid conditions, sash windows made from Accoya won’t swell or shrink, ensuring reliable and smooth opening and closing year-round.
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Yes. Accoya is an ideal timber for use in heritage and listed building projects where authenticity and longevity are equally important. Its natural appearance and ability to be painted or stained make it suitable for replicating original sash window designs while benefiting from modern durability.
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Accoya wood has outstanding thermal insulation properties compared to traditional hardwoods and softwoods. This means Accoya sash windows help to keep properties warmer in winter and cooler in summer, improving energy efficiency and supporting lower energy costs.
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Accoya sash windows come with a 50-year above-ground warranty. This reflects years of proven testing and ensures that your windows will resist rot, decay, and weathering far longer than most traditional timber alternatives.
Window styles
Accoya wood is very versatile, ideal for many different types of windows to suit any home.
Buy Accoya Sash Windows
Find Accoya sash windows for purchase at a location near you.