This report evaluates the outcomes of the Preston Water Efficiency Initiative, an innovative water demand-management project carried out in Preston, Surrey. Its aim was to reduce domestic water consumption in social housing and to provide recommendations for future retrofitting programmes. 160 dwellings, a school, and a leisure centre were fitted water-efficient devices. 205 water-efficient devices were retrofitted, while a pilot rainwater harvesting system was installed in twelve flats. This was combined with a promotional and awareness building campaign. According to the report, significant water savings were achieved through installing water-saving devices, such as 14 % through retrofit devices and 25 % through dual flush toilets and showers.