This course introduces the applications of modern mechanical engineering technologies to buildings systems and how they relate to our livings. A wise design of building systems offers high convenience to the occupants. Building systems, such as structural design, water supply, safety and air conditioning are of high importance to maintain a satisfying temperature, humidity, lighting and indoor air quality for comfortable living and efficient working. The course introduces the latest trend of building design, such as intelligent, and green buildings, micro sensors, Internet of Things (IoTs), VR/AR and metaverse and AI and how to maintain the sustainability and efficiency of the whole building in terms of building duration, energy and operation. The aim of the course is to provide students fundamental understanding and latest case studies on the current technologies for attaining contemporary living, and the difficulties we are facing that we may be ready for future challenges.