This book offers a comprehensive overview of buildings' digital information security, focusing on various phases of building projects and their associated challenges. It covers digitalization in the industry, emphasizing security and privacy concerns. The book explores various phases of construction projects, including design, construction, and operation from a digital information perspective, information security vulnerabilities, impacts, and mitigation measures. Additionally, it discusses the tools and platforms to support digitalization and will review them from the information security point of view. The book also addresses existing security platforms/devices for households and analyzes their affordability and viability. In its last section, the book discusses the applicability and challenges of the current security solutions for complex buildings. The book will appeal to IT and construction professionals wanting to learn more about cybersecurity in this industry.