Water efficiency is a key contributor to resilience, and water companies are currently carrying out large-scale retrofitting and customer engagement programmes. Ofwat and Defra are keen to see greater ambition on water demand management. The Waterwise Water Efficiency Strategy for the UK sets out a range of actions to improve water efficiency in new developments. Waterwise support a national and compulsory rollout of smart metering to provide benefits for customer engagement and water efficiency. We have set out barriers to new technologies as well as a range of new technologies identified by Waterwise and in research internationally.