Bespoke Accoya Timber Windows –
Built to Last 50+ Years
- 50 Year Lifespan
- FSC Certified Timber
- Low Maintenance
Accoya Window Styles at a Glance
Accoya is an ultra-high performance wood made from sustainably sourced timberand modified through a patented acetylation process, delivering unmatched durabilityand dimensional stability. Accoya can be left natural or finished to suit any design,providing lasting performance in any climate or application. Backed by a 50-yearabove-ground warranty and 25 years in-ground or freshwater, Accoya is the trustedchoice for exterior projects where longevity and low maintenance are key.
THE SECRET BEHIND ACCOYA®
Accoya isn’t just wood. It’s wood transformed.
Through a natural process called acetylation, we take fast-growing softwood andenhance it to perform like the finest hardwoods—without the drawbacks. The scienceis simple: by changing the way the wood interacts with water, we remove the rootcause of swelling, shrinking, warping and rot.
The result is real, non-toxic wood that lasts for decades, stays dimensionally stable,and needs less maintenance. Even better, the process is circular: the only by-product is reused as vinegar for other industries.
Accoya sets a new standard in high-performance wood. Stable, durable, versatile and sustainable, it delivers exceptional resultswith no compromise – whether you’re designing for today orbuilding for the future.
Accoya delivers exceptional durability, backed by a 50-year warranty above groundand 25 years in ground or freshwater, certified for use in termite zones, and provento be 22 times more resistant than pine, with a service life of up to 60 years in real-world conditions.
Accoya comes from FSC® certified forests, is one of the few building materialscertified Cradle to Cradle® at the Gold level, and is non-toxic and 100% recyclable.
Accoya wood offers exceptional dimensional stability, swelling 3–4 times less thantraditional wood to keep projects looking great for decades after installation.
Accoya is the ultimate versatile substrate, trusted by craftsmen for its excellentmachinability, improved density and hardness without compromising strength, andthe flexibility to be left natural or finished to suit any design — delivering lastingperformance in any climate or application.
MultiPoint Lock & Friction Hinge
Flush Windows
Our flush windows are hand crafted to perfection, offering a traditional look outside the property with the window sash finishing flush with the frame.
This version comes with multipoint secure locking and friction hinges, meaning PAS24 can be achieved.
Feature
- Crafted by experts!
- Flush-fit colour matching trickle vents, made from aluminium
- Three coat factory paint finish, dual colour available
- Externally beaded for tradition, taped glass for high security
- Range of cill sizes available.
Specifications
- Multipoint secure lock with night vent position
- Available with a range of hardware options
- 1.2 whole window U value with double glazing
- PAS24 available
MultiPoint Lock & Friction Hinge
Stormproof Window
Our stormproof windows are hand crafted to perfection, offering double rebated protection against the outside elements.
This version comes with multipoint secure locking and friction hinges. Available with both double and triple glazing.
Feature
- Crafted by experts
- Range of cill sizes available
- Three coat factory paint finish
- Flush-fit colour matching trickle vents
Specifications
- Available with a range of hardware options
- 1.2 whole window U value with double glazing
- Multipoint secure lock with night vent position
- High security friction hinges, egress as standard on all side openers
MultiPoint Lock & Friction Hinge
Sash Window
Our sash windows are hand crafted to perfection, boasting classic sash aesthetics with smooth long lasting operation.
This option with spiral balance
sliding which can be PAS24 compliant.
Slimline version also available
We also offer a slimline sash window, available with either spiral balance or lead weight openings. The slimline sash accommodates 14mm double glazing and comes with a slimmer meeting rail & sashes. The perfect solution for conservation areas.
Feature
- Seamless corner joints, using twin mortice and tenon joints on all sash corners
- Flush-fit colour matching trickle vents, made from aluminium
- Three coat factory paint finish
- Externally beaded for tradition, taped glass for high security
- Crafted by experts
Specifications
- Available with a range of hardware options
- 1.2 whole window U value with double glazing
- Choice of 4 internal staff bead and external lining options
- Choice of 5 sash horn styles
Why We Only Use Accoya Timber
Let our experts help you find the perfect Accoya window style:
- Doesn't swell or strink
- 50-year above ground warranty
- Perfect for UK weather
- More stable than oak or hardwood
If you are unsure which era your property belongs to, our expert guide: sash windows in London conservation areas 2026 provides the essential context for a successful project.
