The Sliding Sash window is one of the most architecturally significant window types in British building heritage, and Zakuna’s engineered timber sliding sash brings this classic form into the modern era without compromising its essential character.
The vertical sliding movement, the proportions of the glazing bars, and the visual rhythm of the sash frame are all preserved — but beneath the traditional appearance lies a precision-engineered product built on the same three-layer engineered wood beam technology as the rest of the Zakuna timber window range. This engineered core provides the dimensional stability and consistent performance that original solid timber sash windows cannot match, eliminating the swelling, sticking and draughts that are so common with traditional solid sash windows over time. Draught-sealing is incorporated as standard, and the sash counter-balance mechanism is precisely calibrated for smooth, effortless operation.
Zakuna’s Sliding Sash windows are available across all standard and bespoke sizes, with a full choice of glazing bar configurations to match original or historically appropriate profiles.
Traditional horns, putty-style glazing bars, and deep painted reveals can all be specified to satisfy heritage briefs and conservation area planning requirements. Available in a full range of timber species, stains and factory-applied paint finishes — white and off-white being the most frequently specified for period contexts, alongside traditional colours for character properties. All windows are bespoke, made to the precise dimensions of your opening. Visit our Window Showcases to see Sliding Sash windows installed in period and heritage renovation projects in London, Surrey, Sussex, and beyond.
