This book gathers a selection of papers presented at the 6th International Scientific Conference "Environmental Challenges in Civil Engineering", ECCE 2024, held on April 22–24, 2024, in Opole, Poland. Written by an international group of experts, it reports on findings concerning structural material behavior, and new methods and technologies in constructions. A special emphasis is given to sustainable constructions practices, including material recycling and reuse, renovation and restoration of historical building and to those fostering sustainable development of cities and rural areas, and a better integration of buildings with the environment.  Offering a good balance of theory and practice, and covering both technical and organizational aspects in civil engineering and architectural projects, this book offers extensive information on solutions and current challenges in construction projects and structural interventions in the context of environmental protection, earthquake prevention and sustainable urban planning.