Accoya Sash Windows
We're Approved Accoya Wood Manufacturers
Woodcock Sash Windows are approved manufacturers for Accoya Wood Sash Windows. We design sash windows across London & Surrey to enhance the beauty, character, and value of your home.
Combining traditional craftsmanship with the advanced performance of Accoya timber, our windows deliver a refined, long-lasting solution for both period properties and contemporary spaces.
Each sash window is carefully handcrafted in our Chertsey workshop by our experienced team. Using high-quality Accoya wood, known for its exceptional durability and stability, we ensure every detail meets our exacting standards, from initial design through to the final finish.
Why We Choose Accoya Wood
Stable
Accoya remains structurally sound with virtually no movement before, during, and decades after the job is complete.
Durable
Accoya solves the problem of deterioration in any climate, giving you the confidence that you made the right choice.
Sustainable
Accoya has the environmental credentials to make a bold commitment to build any project sustainably.
Versatile
Accoya is the ultimate workable substrate trusted by craftsmen to deliver in any product application.
What is Accoya Wood?
Accoya wood is a premium, sustainably sourced timber that offers exceptional durability and stability, making it the superior material for Box Sash Windows.
With its ability to resist swelling, shrinking, and warping, Accoya ensures that your windows maintain their structure and smooth operation throughout changing weather conditions. Accoya is not only environmentally friendly but also incredibly long-lasting, offering up to 50 years of reliable performance.
K Glass Glazing
Alongside Accoya timber for our window frames, we use K Glass for our glazing. K Glass is a high-performance, low-emissivity glass designed to boost the energy efficiency of your windows.
Its special coating reflects heat back into your home, helping to keep your living spaces warmer in winter and cooler in summer while allowing ample natural light to enter. Perfect for double or triple glazing, its energy-saving properties make it an excellent choice for homeowners who want to improve thermal insulation without sacrificing style.
Origins of Accoya Wood
Accoya begins life as radiata pine, also known as insignis pine or Monterey pine. Its scientific name is Pinus radiata. Although native to parts of Mexico and California, today it is primarily grown in sustainable plantations in New Zealand, Australia, and Chile.
The use of plantation grown timber is important. Radiata pine grows quickly and can be replanted efficiently, making it a renewable and responsibly managed resource.
Once harvested, the raw timber is transported to production facilities in the Netherlands. There, it undergoes a process called acetylation.
What is Acetylation?
Acetylation is a modification process that alters the wood at a cellular level. Rather than applying a surface treatment, the structure of the timber itself is changed. During this process:
- The wood is treated with acetic anhydride.
- The cell walls are permanently modified.
- The timber becomes far less able to absorb water.
- Stability and durability are significantly enhanced.
Crucially, no toxic chemicals remain in the finished product. The process does not coat the wood – it transforms it from within.
Why Does Acetylation Make a Difference?
Acetylation alters the performance of timber by significantly reducing its ability to absorb moisture.
While untreated softwood naturally swells in damp conditions and shrinks as it dries, leading to distortion, cracking and rot over time, Accoya remains exceptionally stable with up to 75% less movement.
It also offers excellent paint adhesion and Class 1 durability, providing outstanding resistance to rot. This enhanced stability is particularly important for sash windows, helping them to operate smoothly within their frames throughout the year while maintaining their appearance and performance for decades.
Our process from concept to completion
1.
Quotation
Begin with a detailed, itemised quotation provided at no cost. Our comprehensive estimate covers all aspects of your project, ensuring transparency and helping you understand the full scope of work involved.
2.
Survey
3.
Manufactured
Your windows are crafted with care in our workshop in Chertsey, Surrey. We utilise advanced techniques and high-quality materials to ensure a perfect fit, with every detail customised to meet your specific requirements.
4.
Installation
Accoya Sash Windows: FAQs
Accoya sash windows are traditional sliding sash windows made using Accoya timber, a high-performance, modified wood known for its durability, stability, and resistance to rot.
Yes, Accoya sash windows are ideal for period properties. They replicate the appearance of traditional timber sash windows while offering improved performance, making them suitable for heritage homes and conservation areas.
Accoya achieves Class 1 durability, the highest rating available for timber. In practical terms, this means:
- A service life of around 50 years above ground.
- Around 25 years in ground or freshwater contact.
- Exceptional resistance to fungal decay.
Timber windows are constantly exposed to the elements. Moisture is typically the main cause of failure in traditional wooden frames. Accoya’s resistance offers several key advantages:
- Highly resistant to rot and fungal decay.
- Resistant to insect attack.
- Performs well in damp and coastal environments.
- Maintains structural integrity over decades.
Accoya timber is designed for exceptional longevity, with a lifespan of 50 years or more above ground. This makes Accoya sash windows a long-term investment with minimal maintenance required.
No, Accoya sash windows require significantly less maintenance than standard timber. The wood’s stability reduces issues such as warping or swelling, helping paint finishes last longer and reducing the need for frequent upkeep.
Sustainability is increasingly important to homeowners seeking environmentally responsible solutions. Accoya offers strong credentials in this area:
- Made from fast-growing plantation timber.
- FSC certified sourcing.
- Non-toxic modification process.
- Long lifespan reduces material waste.
- Fully recyclable at the end of life.
Despite undergoing a chemical modification process, Accoya is completely non-toxic once finished.
- No harmful chemicals remain in the timber.
- Safe for homes with children and pets.
- No toxic leaching over time.
- Environmentally responsible production.
Hear what our customers say about us
