Prefabrication has brought a substantial change in the development of construction industry worldwide over the last few decades. It ensures the strength, economy and environmental performance of the structures and hence is preferred over the onsite construction. Pre-assembly, prefabrication, modularisation, system buildings and industrialised buildings are the various terms used to describe the processes of manufacturing of modular units on-site or off-site. There are various types of modular precast building construction techniques prevalent worldwide.

• Prefabrication Technology has various advantages like:
• The requirement for formwork, shuttering and scaffolding is significantly reduced as Self-supporting ready-made components are used.
• Construction time is reduced thus resulting in lower labour costs.
• Reduced amount of waste materials than in site built construction.
• Reduction in Construction time allowing an earlier return of the principal invested.
• Building ensures accurate conformity to building standards and superior quality assurance.
• High-energy efficiency along with quality control and factory sealing.
• Independent of climatic condition.
• In off-site construction safety and comfort level of worker are higher.