His Majesty King Charles III at the RHS Chelsea Flower Show’s Parkinson’s UK garden, which features Accoya Wood
When His Majesty King Charles III stopped at the Parkinson’s UK garden at this year’s Chelsea Flower Show, the curved walls, the seating and the handrail were built from the material specifiers now reach for by default: Accoya Wood. This high-performance wood already clads the largest timber façade in the world at Google’s London headquarters and runs through more than 6,000 infrastructure, commercial and residential projects across Asia. Transformed through a patented process to outlast tropical hardwood, resist the elements and lock away carbon, Accoya Wood has become the natural choice for architects and specifiers worldwide.
That is the opportunity Cleantech Building Materials (“CBM”) is building towards. Through its subsidiary, Diamond Wood China, CBM holds the exclusive right to manufacture Accoya Wood in China and is now constructing Asia’s first factory to serve fast-growing demand across the region.
King Charles III and Queen Camilla have arrived at the RHS Chelsea Flower Show
Commenting, Willy Paterson-Brown, Chair of CBM, said:
“It was a privilege to see His Majesty King Charles III, whose commitment to the environment is well known, take such close interest in the Accoya Wood at the heart of the Chelsea garden.
“For CBM, occasions like this confirm what our strategy is built on. Demand for genuinely sustainable, high-performance timber is growing worldwide, and we are putting in place the scalable production capacity to meet it.”
Building capacity at scale
CBM’s China factory is being built in phases. Phase 1 will progressively reach 160,000 m³ of annual capacity, Phase 2 will take output to 320,000 m³, and Phase 3 is planned to lift capacity to 480,000 m³ a year, laying the foundation for a major shift towards carbon-negative construction in the world’s largest building materials market.
The environmental case is substantial. On a net basis, every cubic metre of Accoya captures 856 kg of CO2 (944 kg sequestered against 88 kg emitted). At Phase 2 output, CBM’s factory will lock away approximately 274,000 tonnes of CO2 each year, equivalent to removing around 60,000 cars from the road.
The Accoya® Wood advantage
Accoya is a solid wood product created through a patented acetylation process that transforms fast-growing, FSC®-certified radiata pine into a material whose strength and durability rival, and often exceed, those of tropical hardwoods and carbon-intensive materials such as steel, aluminium and PVC.
Used in windows, doors, cladding, decking and high-end structural architecture, Accoya offers:
- Dimensional stability and durability backed by a 50-year warranty;
- Low maintenance and long coating life, reducing total lifecycle cost; and
- Strong performance in tropical climates, including high resistance to termites and splintering, and a cooler surface underfoot.
Accoya is the only structural building material in the world to hold Cradle to Cradle Certified® Gold certification.
Diamond Wood China has held FSC® certification since 2008, ensuring full traceability and responsible sourcing from sustainably managed forests. The new facility will incorporate advanced environmental standards and closed-loop systems that repurpose key production outputs, supporting a circular, low-impact industrial model.
CBM believes these trends reinforce a significant opportunity to establish carbon-negative construction materials at scale in China and across Asia.
Download Press Release: CBM press release re Accoya 6 July 2026