Heritage uPVC windows and doors, created with the most authentic looking flush sash system. Designed for character and period renovations, perfect for conservation areas, and ideal for modern and new build properties with a minimal aesthetic. The Timberlook flush sash is a 70mm uPVC window and door system with mortise and tenon looks, hand-built with the correct joints, here in the UK. It can satisfy local planning authorities in conservation areas, and has been accepted as a variation on condition 11, article 4! The understated design works well in contemporary projects too - It can be specified to the new Document Q and are certified to PAS24.