Accoya Timber Sliding Sash Frames for Your Home
Accoya Timber Frames – Beauty That Lasts for Generations
At Shire Window Solutions, we take pride in combining traditional craftsmanship with the latest in advanced timber technology. That’s why we recommend Accoya® timber frames for our bespoke sliding sash windows in Gloucestershire, Bristol, and Bath. Accoya is a revolutionary, sustainable wood that delivers the natural beauty of real timber with unmatched strength, stability, and long-term durability.
Whether you’re restoring a heritage property in Gloucestershire or upgrading your home with custom-made timber windows and doors, Accoya provides the perfect balance of timeless style, modern performance, and eco-friendly design. With exceptional resistance to rot, decay, and warping, Accoya timber frames not only enhance your home’s appearance but also ensure decades of reliable performance with minimal maintenance.
What Is Accoya Timber?
Accoya is far from being ordinary wood—it is the result of decades of scientific research and innovation. Through a unique, patented process known as acetylation, sustainably sourced softwood is transformed at a molecular level, creating a material with exceptional durability, stability, and weather resistance. This process permanently alters the wood’s cell structure so that it resists the natural expansion, contraction, and degradation that affect untreated timber.
Unrivalled lifespan: Accoya offers an extraordinary service life of up to 50 years above ground and 25 years in ground or freshwater environments. This means that once your windows or doors are installed, they will continue to perform for decades without the need for replacement, even in challenging outdoor conditions.
Class 1 durability: As the highest possible rating for timber, Class 1 durability confirms that Accoya is extremely resistant to rot, decay, and insect attack. Unlike many traditional hardwoods, which may show signs of deterioration after just a few years, Accoya retains its strength and structural integrity for the long term. According to Accoya (2024), independent tests show Accoya lasts 60 years above ground—outperforming traditional hardwoods by 2–3x
Environmentally friendly: Every piece of Accoya timber is sourced from FSC®-certified sustainable forests, ensuring that your home improvement choices do not contribute to deforestation. The wood is also completely non-toxic, containing no harmful chemicals, and is 100% recyclable at the end of its life, making it one of the most eco-friendly building materials available today.
By choosing Accoya, you can enjoy all the warmth, character, and beauty of real wood without the typical drawbacks of warping, swelling, shrinking, or demanding upkeep—giving you windows and doors that look stunning and perform flawlessly year after year.
Transforming Homes Across the South West with Accoya Timber Windows & Doors
At Shire Window Solutions, we supply and install Accoya timber windows and doors across Gloucestershire, Bristol, Bath, and the wider South West and beyond. Whether it’s a Georgian townhouse in Bath, a Victorian property in Bristol, or a Tewkesbury cottage in Gloucestershire, Accoya offers the perfect balance of timeless style, modern performance, and sustainability—built to last for generations.
Why homeowners choose Accoya timber:
- Long lifespan – up to 60 years above ground.
- Dimensionally stable – no warping, swelling, or shrinking.
- Energy-efficient – keeps homes warm in winter, cool in summer.
- Eco-friendly – FSC® certified, non-toxic, and recyclable.
- Ideal for both heritage and modern properties.
Why Choose Accoya Timber Frames?
Outstanding Stability – Unlike many other timbers that swell in damp weather and shrink in dry conditions, Accoya timber remains remarkably stable throughout the year. This means your windows and doors will continue to open and close effortlessly, no matter the season, with no sticking in summer or gaps in winter.
Low Maintenance – Thanks to Accoya’s unique treatment process, paints and finishes adhere far better than on ordinary wood. This ensures that your chosen finish lasts for many years without cracking or peeling, significantly reducing the frequency of repainting and the time required for upkeep.
Energy Efficiency – Accoya timber is naturally insulating, helping to keep warmth inside your home during the winter and preventing heat from entering in the summer. When combined with high-performance double glazing, it provides exceptional thermal efficiency, making your living spaces more comfortable while lowering your energy bills.
Eco-Friendly – Sourced only from FSC®-certified sustainable forests, Accoya timber is a renewable resource that’s non-toxic and safe for your family and pets. At the end of its life, it is 100% recyclable, meaning it returns to the earth without leaving harmful waste behind.
Long-Term Value – With a service life of up to 60 years above ground, Accoya timber easily outperforms traditional hardwoods in both longevity and durability. Its resistance to rot, decay, and insect damage means you’ll enjoy decades of reliable service, making it a cost-effective choice over the lifetime of your home.
Advantages of Accoya Timber Frames
When you choose Accoya timber frames, you’re not just choosing windows or doors—you’re choosing decades of performance, style, and peace of mind. Here’s why more and more homeowners in Gloucestershire, Bristol, and Bath are making the switch:
1. Durability & Longevity
Accoya is proven to last far longer than traditional hardwoods and softwoods—up to 60 years above ground and 25 years in ground or freshwater conditions. It’s naturally resistant to rot, decay, and insect attack, meaning you won’t have to worry about replacing your frames for decades. Even in harsh weather, Accoya holds its integrity, making it a smarter long-term investment than tropical hardwoods or chemically treated woods
2. Stability & Low Maintenance
Ordinary timber frames often warp, swell, or shrink with changes in temperature and humidity. Accoya timber is dimensionally stable—meaning your windows and doors will continue to open and close smoothly throughout the year. Its exceptional coating adhesion also means paint and finishes last longer, reducing the need for frequent maintenance and repainting.
3. Energy Efficiency
Accoya timber has outstanding thermal performance—8% better than softwood and 30% better than hardwood. When paired with double glazing, Accoya frames help keep heat inside during winter and outside during summer, reducing your energy bills and making your home more comfortable all year round.
4. Environmental Performance
Accoya has been awarded Cradle to Cradle® Gold certification, one of the highest sustainability standards in the world. Its low carbon footprint, renewable sourcing, and exceptional lifespan make it the ultimate choice for environmentally conscious homeowners who want high performance without harming the planet.
Windows in Every Style – Made for Your Home
We manufacture and install a wide range of bespoke windows in Gloucestershire, combining the beauty of timber with the benefits of modern glazing.
Sash Windows in Bristol & Bath
Our sash windows in Bristol and Bath are the ideal choice for heritage and period properties, offering the perfect blend of authentic style and modern insulation. Designed to replicate the classic elegance of traditional timber sash windows.
Double Glazing Windows Dursley
Double glazing windows in Gloucestershire are designed to improve comfort, reduce outside noise, and lower energy bills. With superior insulation and modern glass technology, our double-glazed windows keep your home warm in winter, cool in summer.
UPVC Windows stroud
Our UPVC windows in Gloucestershire are a low-maintenance and cost-effective solution for homeowners who want lasting performance. Available in a wide range of colours, styles, and finishes, these windows combine excellent energy efficiency with durability.
Aluminium Windows Gloucestershire
Choose aluminium windows in Gloucestershire for a sleek, modern look with slim frames, excellent thermal efficiency, and outstanding durability. Perfect for both contemporary and traditional homes, aluminium windows.
Why Choose Accoya Timber for Your Windows?
Timeless Beauty, Modern Performance, Lasting Strength
Timeless Beauty
Accoya timber combines the natural charm of real wood with advanced treatment technology, ensuring your windows look stunning and stay true to your property’s character.
Built to Last
Engineered for strength and stability, Accoya resists warping, shrinking, and swelling—delivering unmatched durability for decades to come.
Energy & Weather Performance
Our Accoya timber windows exceed modern energy efficiency and weatherproofing standards, keeping your home warm, quiet, and protected all year round.
Sustainable Choice
Accoya is sourced from FSC®-certified forests and is fully recyclable, making it one of the most eco-friendly timber options available today.
FAQs
What makes Accoya timber different from other wood?
Accoya timber is created through a patented process called acetylation, which changes the wood at a molecular level. This makes it exceptionally stable, resistant to rot, and far more durable than traditional hardwoods or softwoods—while still offering the beauty of natural timber.
How long will Accoya windows and doors last?
Accoya timber frames have an unrivalled lifespan of up to 50 years above ground and 25 years in ground or freshwater. This makes them one of the longest-lasting timber options available, perfect for homeowners in Gloucestershire, Bristol, and Bath looking for a long-term investment.
Is Accoya suitable for double glazing?
Yes. Accoya works perfectly with double glazing windows and double glazed doors, offering excellent thermal insulation and helping reduce energy bills while keeping your home comfortable all year round.
Will my Accoya windows or doors warp over time?
No. One of Accoya’s biggest advantages is its dimensional stability. Unlike many other timbers, it has minimal swelling or shrinking, meaning your windows and doors will open and close smoothly in all weather conditions.