This book presents selected papers from the 6th International Conference on Rehabilitation and Maintenance in Civil Engineering (6th ICRMCE) on July 4-5, 2024, at Mataram, Indonesia. The papers cover topics related to developing and maintaining a sustainable built environment to mitigate the environmental impacts of human activities and create a healthier and more resilient future. This is achieved through infrastructure development and maintenance issues from various perspectives and is brought together under the theme of policy, design, construction, rehabilitation, and maintenance for a sustainable built environment. Readers will gain a deeper understanding of how to identify and solve issues related to infrastructure design, construction, use, and maintenance toward realizing a sustainable built environment by tapping into various fields' expertise within civil engineering such as material, structural, geotechnical, transportation, water resources, and construction management.