This chapter provides a comprehensive overview of modular construction, focusing specifically on its methodological aspects. It begins by examining the various forms of modular construction methodology, highlighting how these differ in their design principles, manufacturing processes, and assembly techniques. The discussion covers key approaches such as volumetric modular construction, panelized systems, and hybrid methods, each offering distinct advantages in terms of speed, quality control, and adaptability to different project requirements. The chapter then explores the essential requirements for implementing modular construction effectively. These include project requirements, building component standardisation, and construction industry standards. Attention is also given to manufacturing capabilities, construction processes, and cost and time constraints. The chapter also addresses the limitations and challenges that hinder the widespread adoption of modular construction. Key constraints include perception, stigmatisation, limited design flexibility, transportation and complexities, and difficulties in adapting standardised modules to diverse local codes and environmental conditions. Resistance to change within the industry and the need for specialised skills further compound these challenges.