The invention of toilet facilities can be traced back to thousands of years ago in our history. Development of toilet facilities represents the evolution of mankind civilization, rather than adhering to the norm, the Architectural Services Department – the Government of the HKSAR is evolving from traditional toilet into ‘Smart Toilet’ with the application of the emerging Internet of Things (IoT) technology. IoT connects interrelated devices through network to collect and transfer data in conglomeration without human involvement. In Smart Toilet, various types of sensors are employed to retrieve useful data for facilities upkeeper to be aware of and monitor the conditions of toilets efficiently. For example, the air quality sensor allows real-time monitoring of indoor air quality which facilitates the cleaners to response and upkeep the toilet’s hygienic condition. With the help of Artificial Intelligence (AI) and Big Data analytics, the massive data retrieved from IoT can also provide greater insight to guide the enhancement of Smart Toilet such as better user experience and lower energy consumption. The success of Smart Toilet acts as an important threshold for the future development of “Smart Building” and even “Smart City”, which transforms the world into a better place.