Due to the climate goals, the Netherlands still has 28 years to get all houses and buildings off gas. To be able to realize this, acceleration is necessary and TNO is therefore arguing for a different approach to the energy transition in the built environment, with which 70% of the building stock can be made more efficient, cheaper and faster. Central to the approach are 'contingents', which are formed by a match between a proven sustainability solution and the building DNA (properties of a building). This offers more opportunities for targeted innovation and upscaling, which reduces costs and offers certainty about the sales market.