Sprong in Dutch means “leap forward.” In fact, a leap forward is exactly what Energiesprong has realised over the last few years in the residential housing construction and energy efficiency sector in the Netherlands. One figure reigns above all: 11,000. This is the amount of homes that have been renovated and transformed into Net Zero Energy (NZE) houses by the pioneering project born out of an agreement between Dutch property developers and social housing associations, and which is now expanding into the rest of Europe and the USA. In Holland, just as in numerous other European countries, it is important to renovate social housing built in the 1960s which, after 50 years of use, is often characterised by intense energy inefficiency and high maintenance costs. In the ...