"Eco-building a better world" is a training course that brought together 34 young leaders and youth worker active in 16 organizations from different countries (Europe, Eastern Europe and Caucasus, Mediterranean) for 9 days (1-10 September 2015) in Tramonti (Amalfi Coast), to exchange ideas and experiences, to develop their skills and working methods and to launch a lasting partnership that will enable them to plan and implement programs to raise awareness about "green homes" and sustainable development programs targeted to youth and citizens of their countries. The main aim of the project was to improve the quality of youth work by exploring non-formal learning approaches connected to eco-buildings, as well as learning by doing approaches, developing their competences and strengthen the connection with the environment and the local community. This training course was divided in 3 blocks of activities, one of which was based on a Learning by Doing approach. In fact participants were engaged in the transformation of an already existent but neglected barn, into an eco-building with efficient energy consumption and thermal insulation, using healthy and natural materials such as straw, clay, canes and wood. In the future this building is set to become a place for educational activities and workshops about local sustainability for young people as it will be a standing demonstration, open to everyone, of what is an eco-building and why it is important to follow this good practice.