Timber Box Sash Windows

Glorious to behold, easy to slide and constructed to deliver the highest standards of insulation, security and longevity, our sash windows are available with traditional chains, cords or a hidden spring mechanism.

Our box sash windows have been designed to ensure that frames, meeting rails and glazing bars replicate the traditional form as closely as possible. Using very modern materials and methods, the modern timber box sash windows are close in appearance to the originals, but in retrospect completely different with regards to security and thermal properties.

The design of our vertical sliding sash window is the product of an extensive collaboration between our technicians and consultant architect to ensure that our box sash reproduces, as faithfully as possible, the simple grace of English box sash windows.  These progressively developed from early use by Christopher Wren throughout their peak of elegance in the late Georgian period and in common usage by the Victorians and Edwardians.

With the adoption of engineered timber in British windows and chains in place of cords, they now provide the strength required to hold the double glazing. Triple or quadruple draught strips stop rattles, and the extremely high insulation glazing units minimise heat loss and reduce draughts.  Multi-layered timber and very careful attention to detail minimises the swelling and warping that causes jamming on windows of lower quality during wet weather.


Our Sash Box is available in two depths - standard at 176mm and slim sash at 142mm. The Slim Sash, at 142mm is the slimmest traditional sash window available in the UK allowing the window to finish flush with the original plaster lines without projecting into the room in most instances. The Slim Sash carries narrower double glazed units maintaining the same level of insulation by using high performance krypton gas between the glasses. Samples of both our standard and slim sashes are available to view in our Horndean & Winchester showrooms.

Timber box sash

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