Public schools in Egypt are considered a valuable asset that should be preserved and sustained, as they play a paramount role for the development of a sustainable community. Whereas, currently, the schools in Egypt are not sustainable from social, economic and environmental perspective as they are generally heavy, fixed and normally irreversible once construction has been completed. This is due to the traditional construction method used in the construction of schools which consumes time and generates a vast amount of waste. In addition, the changing demands of the occupants may confront the need for future expansion or complete changeover. With the increase in labour costs, lack of skilled labours for different trades, demand for faster construction, increased considerations for safety and environment and above all meeting these demands at an economic and reasonable price requires us to change the approach used in construction. Hence, these faults could be sufficed with the introduction of green prefabrication methods as a flexible design approach for achieving sustainability for primary public schools in Egypt. Therefore, this paper aims to formulate a matrix that correlates the flexible design criteria with suistainability in order to achieve suistainability in Primary Public schools in Egypt.A research methodology consists of literature review to investigate the topics of primary public schools, flexible design, Green prefabrication and sustainability.