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Box Sash


Townhouse, country mansion or cottage, traditional sliding sash windows compliment any property of any period. Tailor made lead weights hung on chords through pulley wheels ensure the sashes slide vertically in a fluent and effortless manner, original to the vertical sliding sash window.

We offer a wide choice of internal profiles to suite different periods, including Ovolo, Lambs Tongue, Ogee, but can also match and replicate any profile for individual projects.

Double Glazed Box Sash Windows

Our double glazed box sash windows combine traditional aesthetics with modern technology. Highly thermal efficient double glazed units minimise heat loss and condensation whilst precision in draught sealing helps to reduce draughts and noise.

Specializing in manufacturing traditional sash windows, we replicate the aesthetics of the traditional window and combine it with the latest window technology. Close attention to detail during design ensures the window's bars, rails, horns and proportions are all accurately reproduced.

Single & Specialist Double Glazed Box Sash Windows

Predominantly used in listed buildings and conservation areas, our single glazed box sash windows feature many bespoke options tailored to the requirements of a period building. 4mm float glass is used as standard but drawn, plate and cylinder blown glass can also be used for a more authentic look. Specialist slim sightline double glazed units are more frequently being allowed in listed properties when glazed within solid glazing bars. Nicholls & Clarke Eco-Lite specialist slim sightline double glazed units are constructed using narrower cavities between the panes of glass and perfectly replicate the appearance and features of single glazing on original timber windows.

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