Six Grade II Listed Georgian Townhouses situated in Gloucester Place, London have been renovated into a comfortable and peaceful hotel. A key issue identified during the transformation was the original windows, which were draughty, thermally inefficient and allowed noise ingress – not a comfortable environment for guests of a hotel. Selectaglaze installed in excess of 80 secondary glazed units. The Series 90 was used on the larger windows which were up to 3m high and used up to 10.8mm thick glass. It is a heavy duty vertical sliding unit with specialist balances which allow large and weighty panels to operate with ease. When thicker glass is used, coupled with a gap between the primary and secondary glazing of at least 100mm; they work together to stop the glass from resonating and allowing sound through. This dramatically reduces the outside noise entering into the room. Using an acoustic laminated glass helps to absorb the sound even more, resulting in noise reductions of at least 46dB. All the secondary glazed units were fitted with low-E glass, which provides U-values of around 1.8, to help reduce heat loss throughout the building.