This report provides a comprehensive analysis of architectural theories applicable to sustainable building design. It begins with an introduction to the evolution of architectural design, highlighting the increasing use of technology like Building Information Modeling (BIM) and the concept of Whole Life Cycle Costing (WLC). The report then delves into various theoretical frameworks, emphasizing the importance of sustainability in design and the integration of energy-efficient designs, such as solar energy, to reduce energy consumption and enhance building efficiency. It examines the principles of resource conservation, cost efficiency, and human adaptation in sustainable design. Furthermore, the report discusses the conflict between architects' creative designs and engineers' need for predictable structures and suggests harmonization through sustainable design approaches. The report also covers architectural theories like universal space theory, critical regionalism, and the theory of signs, and concludes by emphasizing the growing appreciation for sustainability in architectural design and the aim of creating simpler, user-friendly spaces that meet present and future demands.