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15 May 2026
Conservation Casement Windows
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Manufacture from engineered timber, Accoya, Oak and Sepele hardwood, the outer frame and sash are flush and feature slim sightlines to provide a larger glass area. The window system is internally beaded to enhance security, certified to PAS 24:2022 and is weather tested to meet the extreme conditions of the British Isles.
The Lignum Flush Casement Window is A rated for energy efficiency and has a U-Value of 1.3 W/m2K with a warm edge Low-E argon filled double-glazed unit.
Lower U-Values - 0.9 - can be achieved with triple or vacuum glazing
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