The objective is to reduce landfilled quantities which are supposed to be documented, but clear evidence of the effect on prevention does not exist. There are a number of regulatory approaches also in this regard, as well as requirements in terms of acceptance criteria and price setting for C&D waste at the disposal facilities that also indirectly require the builders to sort and prepare for recycling as well as to recycle building and construction materials on site. The Municipality of Oslo implemented the mandatory identification of hazardous substances and a waste plan for demolition projects in the middle of the 1990's and the national environment agency in Norway implemented similar demands in 2008 for any building of 100 m2 or more (Norconsult, 2010).