Discover the exceptional beauty, strength, and longevity of Accoya sash windows in London, expertly crafted by Landmark Windows & Joinery. With more than 35 years of experience,we design, manufacture, and install sustainable double-glazed Accoya sash windows that meet the strict requirements of London’s conservation and heritage areas. Our windows combine authentic period elegance with outstanding modern performance—ideal for homeowners who demand durability, efficiency, and timeless style.
London’s Finest Accoya Windows
At Landmark, we have long specialised in traditional timber windows and doors, our premium choice is now the finest Accoya timber. Our joiners have invested tens of thousands of hours refining the craft, producing what many consider the highest-quality Accoya sash windows available in London.
Our premium double-glazed Accoya sash windows deliver exceptional insulation—keeping homes warm on the coldest nights—while enhancing the character of any property with authentic Georgian, Victorian, or Edwardian detailing. Beautiful, efficient, and built to last, these windows offer year-round comfort and meaningful reductions in energy usage.
From simple replacements to the most intricate like-for-like reproductions, we’ve mastered every style, scale, and architectural requirement. With Landmark, even the most complex heritage installations are completed with unmatched precision, craftsmanship, and care—ensuring every window is a perfect balance of performance and period charm.
The Benefits of Accoya
Accoya offers several significant advantages over other types of wood used for sash windows, especially for homes in London.
Superior Durability & Resistance to Weathering: Accoya undergoes a unique acetylation process, making it highly resistant to rot, decay, and insect damage. This makes it particularly suitable for London’s varied and often wet climate.
Longer Lifespan: Accoya windows last 50+ years above ground, outperforming standard hardwoods – even in harsh conditions. Factory spray-painted, they last significantly longer than traditional timber – cutting maintenance costs, plus, skipping paint won’t void the rot guarantee. Ideal for hard-to-reach areas like upper floors, Accoya offers a long-lasting, low-maintenance solution.
Enhanced Thermal Insulation: Accoya wood’s thermal properties are improved due to its dense structure. Combined with double glazing, it offers superior insulation, which is crucial for energy efficiency in London homes.
Environmental Sustainability: Accoya is made from sustainably sourced wood, and its production process is eco-friendly. It has a very low environmental impact and a long lifespan, which reduces the frequency of replacement windows.
Timeless Beauty and Traditional Elegance
Accoya sash windows deliver the ideal balance of classic elegance and cutting-edge performance, making them a striking addition to any home. Thanks to Accoya’s smooth texture and uniform grain, every window achieves a flawless, refined finish that elevates the natural beauty of traditional timber.
Designed to suit London’s diverse architectural landscape, our Accoya sash windows complement everything from period homes in conservation areas to contemporary interiors. Accoya’s exceptional paint-holding properties also allow for complete customisation—whether you choose rich heritage tones or soft, understated colours.
Beyond their timeless appearance, Accoya sash windows are engineered to stay looking immaculate for decades. They resist swelling, shrinking, and weathering, ensuring the clean, sharp lines of your windows remain perfectly true over time. This long-term stability makes them a superb choice for homeowners who want enduring beauty with minimal maintenance.
Offering unparalleled durability and authentic charm, Accoya sash windows truly combine the best of both worlds: traditional aesthetics and modern, high-performance timber.
Why Choose Our Accoya Sash Windows?
With over three decades of experience, our skilled in-house team understands the unique requirements of London’s conservation areas, ensuring that our windows not only meet but exceed industry standards. When choosing Landmark Windows, you receive:
A complimentary site survey and personalised design consultation
Superior craftsmanship emphasising bespoke detailing
Traditional slimline profiles paired with discreet, high-performance glazing
Advanced draught-proofing for exceptional energy efficiency
Premium-grade ironmongery provided as standard
Expert replication and replacement of sash bay windows and doors to maintain original aesthetics
Fully in-house installation by skilled professionals
A reputable, family-run business with decades of expertise
Recommended by conservation specialists throughout London
Swift project turnaround with an unwavering focus on quality
Exceptional customer satisfaction, backed by glowing reviews
