These circular economy principles focus on sustainable building design.  They stress resource efficiency in construction in order to prevent and reduce construction and demolition waste and facilitate re-use and recycling of building materials and products.  The document informs the key participants in the building value chain about sustainable building design.  The document informs the key participants in the building value chain about sustainable building design.  It builds on the voluntary Common European Framework of Sustainability Indicators – "Level(s)".