CityLoops is a four-year EU-funded project focused on two waste streams: organic, and construction and demolition waste, including soil. Høje-Taastrup and Roskilde (Denmark), Mikkeli (Finland), Apeldoorn (the Netherlands), Bodø (Norway), Porto (Portugal) and Seville (Spain) are the seven European cities involved in the project that will develop and test a series of demonstration actions on construction and demolition waste (CDW) and organic waste (OW) with the aim of achieving material circularity. Over 30 new tools and processes will be tested as part of CityLoops.