This chapter presents a global perspective on modularity methodology in the construction industry, offering insights into its guiding principles, growth drivers, economic implications, and application alignment. It begins by outlining the fundamental principles of modular construction methodologies, including standardisation, componentisation, flexibility, and integration of quality control. These principles serve as the foundation for efficient design, manufacturing, and assembly processes, enabling consistent quality and reduced construction timelines. The chapter then examines the factors influencing the growth of modularity methodologies worldwide. These include advancements in technologies, rapid urbanisation, labour shortages in traditional construction, and the need for large-scale infrastructure projects. An economic analysis follows, assessing the cost–benefit aspects of modular construction. The discussion considers initial capital investment, operational efficiency, lifecycle cost savings, and return on investment. This analysis highlights that while upfront costs may be higher, long-term economic and environmental gains make modularity an attractive option for many stakeholders. Finally, the chapter addresses the importance of matching modularity methodology applications to specific phenomena within the built environment. It explores how factors such as project scale, function, location, and cultural context influence the choice and success of modular systems. Overall, the chapter underscores that modularity methodology, when applied strategically and contextually, holds significant potential to transform the global construction industry, delivering faster, more sustainable, and cost-effective building solutions.