The housing corporation Elkien wants to make their housing stock of social housing energy-neutral and circular. This is rooted in their ambition to have the whole stock energy neutral in 2030. In addition to energy neutrality also circular building materials and design principles are taken into account. Several Frisian construction and installation companies as well as local banks, may play a role in order to get the existed housing in Friesland circular as soon as possible, together. The property portfolio of Elkien for example, is divided into three construction companies thereby experiences on this subject will be exchange. This creates employment and save fixed costs since the monthly gas bill no longer have to be paid.