Working with Mount Anvil, a swimming pool area in a Grade II Listed home has been restored to its former grandeur, with the assistance of sealed units and curved on plan secondary glazing. One of the areas of the house which needed particular attention was a room in the lower level where there is a new swimming pool and small spa area. The original single glazed sash windows did little to provide heat retention nor privacy from the neighbours overlooking the space. To ensure maximum U-values were gained, 24mm double sealed secondary glazed units were required with obscure glass to provide privacy. Six of the units were produced from the Series 41 side hung casement range, glazed with 4-16-4 gas filled sealed units. One of which was a large door measuring 2295mm (h) x 1204mm (w). These systems, when combined with a single glazed timber frame window, achieve U-values of around 1.63 W/m2K. To match the sightlines of the bay window framing the jacuzzi, curved on plan units were specified. The Series 41 side hung casement, was manufactured with 6.4mm toughened glass to provide maximum heat retention in these three beautiful sweeping openings.