What is Accoya Wood?
Accoya wood is a premium, high-performance timber created from Radiata pine through a process called acetylation. This innovative process permanently transforms the wood, making it extremely durable, dimensionally stable, and resistant to moisture, rot, and insects. Unlike conventional wood, Accoya doesn’t rely on toxic chemical treatments, making it a safe and environmentally friendly choice for your home.
When crafted into window frames, Accoya combines long-lasting performance with natural beauty, making it perfect for both modern and traditional architectural designs.
Why Choose Accoya Wood for Windows
Stable
The benchmark for stability is set by Accoya wood. By focusing on the cells that cause wood movement, its patented manufacturing process stops warping, twisting, and swelling. This window design withstands all weather conditions and maintains its shape year-round, ensuring reliable, consistent performance for homeowners without compromising on quality.

VIRTUALLY NO MOVEMENT
High usability of boards that stay straight before and after installation.

DIMENSIONALLY STABLE
So dimensionally stable that even harsh environments will not impact installation.

MINIMAL MAINTENANCE
3-4 times less swelling than traditional wood species, minimal movement keeps projects looking great.
Durable
Accoya wood offers remarkable durability above ground and in water because it is cellularly engineered to withstand fungal decay. It ensures that your windows look and work as flawlessly as the day they were installed by operating dependably in almost any setting.

INDUSTRY-LEADING WARRANTY
50-year warranty above ground and 25-year warranty in ground or fresh water.

VIRTUALLY TERMITE-PROOF
Certified for use in termite zones and 22 times more resistant than pine, it’s exceptionally durable.

60 YEAR SERVICE LIFE
An impressive service life demonstrating significantlyhigher durability with real world testing.
Versatile
Thanks to its exceptional stability and versatility, Accoya is suitable for nearly any design application, we specifically use it to craft high-quality windows and doors.

EXCELLENT MACHINABILITY
Excellent machinability, easy to work with, no special tools required.

RETAINED STRENGTH & DENSITY
The best of both worlds, improved density and hardness without sacrificing strength.

EXCEPTIONAL FINISH
Leave natural for exquisite grain patterns or create a unique finish of your choice.
Sustainable
Accoya wood is a material with a purpose. Sourced exclusively from FSC® certified forests, it delivers minimal environmental impact without sacrificing quality or performance. Accoya is a testament to a more sustainable future, demonstrating that eco-friendly decisions can coexist with superior performance thanks to its long service life and low carbon lifecycle footprint.

SUSTAINABLY SOURCED
Accoya comes from fast-growing sustainable forests.

NON TOXIC
Safe for people, pets and the environment.
Eco Sash & Case Are Approved Accoya Suppliers
As an Approved Accoya Supplier, we’re proud to deliver products that meet the highest standards of quality and craftsmanship. Every Accoya window we manufacture and install is:
- Made from authentic, certified Accoya timber
- Built to Accoyas-approved specifications for lasting performance
- Covered by Accoya’s industry-leading 50-year warranty
- Designed to combine exceptional durability, stability, and sustainability


