Bespoke Windows
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Timber windows that make the right impression
We manufacture a wide range of bespoke timber windows, including traditional sash and casement styles. Each window is expertly crafted from high-quality hardwoods with exceptional attention to detail and workmanship. Designed without break joints, our windows offer a seamless, refined appearance – ideal for enhancing premium properties. Alongside classic aesthetics, our windows also deliver modern benefits such as advanced security, energy efficiency, and full compliance with the latest building regulations.
PAS24 Certified Windows
Crime Through High Security Windows
Our PAS24 Windows Range
Our PAS24 range includes timber Box Sash Windows and Casement Windows, with a reinforced construction, toughened glazing and upgraded window ironmongery. These windows have passed rigorous third-party tests to ensure they are protected against forced entry methods.
Features include:
• Choice of attractive designs
• Bespoke sizes, mouldings and finishes
• Weather performance tested
• Energy efficient double-glazing
• Large sash sizes – up to 1400 x 2200mm
• 10 Year Product Warranty
Sliding Sash Windows
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Sash windows add timeless charm and a touch of heritage to any property, whether it’s a grand country estate or a modern townhouse. Featuring two sliding glazed frames, known as ‘sashes,’ set within an outer frame, they’re celebrated for their distinctive and elegant design.
Our range offers the perfect blend of traditional style, functionality, and energy efficiency, making them ideal for both restoration projects and new builds.
Our sash window range includes bespoke options tailored to meet the unique needs of every property:
- Traditional sash windows
- Spring Balance windows
- Conservation sash windows
- Heritage sash windows
- PAS24 sash windows
Bespoke Timber Window Design
At Derwen Joinery, we craft bespoke timber windows tailored precisely to your project needs – whether it’s a new build, renovation, or a listed building. Our experienced joiners expertly replicate intricate details and designs, ensuring heritage and conservation windows maintain their authentic character. Choose from a variety of hardwoods, mouldings, curved headers, and glazing bar options both solid and face-applied complemented by a refined selection of ironmongery.
We use high-quality hardwoods such as Sapele and European Oak sourced from sustainable forests, as well as Accoya, a modified timber renowned for its outstanding durability and performance. Your windows can be finished in any RAL colour through our microporous paint system, ensuring both beauty and protection. For added security, PAS24 enhanced windows are available, meeting stringent standards for energy efficiency, weather resistance, and property protection.
Casement Windows
Windows that Deliver Style and Performance
Timber casement windows remain one of the UK’s most sought-after styles, and Derwen Joinery offers a range of three main types to suit various needs:
Traditional Flush Casement Perfect for window replacements in traditional properties and period renovations, offering genuine character and style.
PAS24 High Performance Casement Energy-efficient windows designed for new builds and change-of-use projects.
Conservation Casement Perfect for properties in conservation areas
Conservation Windows
Timber Windows Tailored to Conservation Needs
Derwen Joinery specialises in handcrafting bespoke timber windows for listed buildings and conservation properties. Our extensive expertise comes from working closely with building contractors on projects ranging from minor replacements to major renovations of heritage properties, including those of significant historical value.
The latest from our blog…
Our New CNC Machine at Derwen Joinery
A behind-the-scenes time-lapse of the installation of our new CNC machine at Derwen Joinery. This marks an exciting step forward as we continue to manufacture traditional British joinery using advanced engineering and modern precision. We’re incredibly proud of this investment and what it means for the quality, craftsmanship, and future of our work.
Ty’n Llan; Where Tradition and Modern Design Meet
Over a two-year period, Derwen Joinery worked alongside main contractor T.G. Williams to transform Ty’n Llan in Llandwrog into a beautifully revitalised community pub. Our bespoke internal and external timber work blends modern craftsmanship with the building’s historic character, creating a warm and enduring space for the local community.
Bespoke Joinery for Gilfach Ddu, Llanberis
We were appointed by T.G. Williams Builders Ltd to deliver a specialist joinery package for the historic Gilfach Ddu site in Llanberis. Our work included robust Douglas Fir external door sets built with traditional mortice and tenon joinery, bespoke Welsh Larch louvred screens engineered for natural ventilation, and fire-rated internal door sets.
Each element was crafted in-house to blend heritage-led design with durable, high-performance materials, ensuring long-term reliability and a cohesive finish across the site.