The increasing demand for sustainable smart building management systems has motivated the development of advanced solutions, among which is the Internet of Things (IoT). This paper introduces a comprehensive Intelligent IoT framework that has been methodically designed for energy-efficient smart building management in real-time. The approach displays the complex details of the architecture, highlighting significant components such as technologically advanced sensors and real-time data processing systems. The framework’s implementation instructions, which describe technologies, programming languages, and compatibility issues, offer a step-by-step guidance with a focus on seamless integration. Implementation-related challenges, such as technical complexities and interoperability problems, are addressed with innovative workarounds and useful solutions, adding important insights to the area. The framework’s effectiveness is demonstrated by the way real-time data is employed to inform decision-making and promote flexibility for sustainable building management. Additionally supporting the field of smart building technology, this research provides to the stakeholders who are interested in enhancing built environments’ energy efficiency with practical insights. To sum up, the Intelligent IoT Framework delivers a comprehensive solution for the dynamic field of real-time energy-efficient smart building management by serving as a prototype for the synergy between creative methodology and practical implementation.