The aim of this thesis is to study the fundamentals of pre-fabricated modular construction and comprehensively device strategies pertaining to the application of pre-fabricated construction system for flexibility, adaptability and sustainability in context to multi-functional urban needs. The research explores applications of various prefab techniques and systems, core materials, assembly and method of executions through case studies catering to user needs and contexts. The research focuses on the usage of prefabricated construction techniques to provide sustainable, flexible and adaptable urban solutions for high density urban tissues. The research initially investigates the evolution of prefabricated building systems through out history and draws a comparision between the on-site and off-site constructon systems in order to understand the advantages and disadvantages of each system.