If you’ve been researching replacement sash windows or timber casement windows, you may have come across terms like FENSA, PAS 24 and Part Q. They all relate to windows, doors and building regulations, but they apply to very different situations. Confusing them is easy, but it matters because understanding which framework actually applies to your…
Here at the Specialist in Traditional Sash Windows, we have over 200 years of experience installing new and replacement wood sash windows for customers across London, the Home Counties, and the South East. All our wooden sash windows and box frames are built to order from our workshop in Guildford, Surrey, and installed by our own specialist fitters.
As part of our commitment to sustainable production, we exclusively use high-quality timber for our double-glazed sash windows. We NEVER use uPVC plastic for our frames – the manufacture of which uses 8 times more energy than timber windows. In particular, we specialise in the use of Accoya for our sash windows: a beautiful, natural wood that is vastly more durable and sustainable than plastic alternatives.
Our work is fully guaranteed, with up to a 50-year timber warranty against rot for added peace of mind.






