D’Oca, Simona and Ferrante, Annarita and Ferrer, Clara and Pernetti, Roberta and Gralka, Anna and Sebastian, Rizal and Op ‘t Veld, Peter Technical, Financial, and Social Barriers and Challenges in Deep Building Renovation: Integration of Lessons Learned from the H2020 Cluster Projects. Special Issue Heroes of Zero—Implementing the Lessons Learned from Pilot Programs towards Achieving Low-Energy or No Waste in Buildings, Communities, and Cities, 8. ISSN 12