Cost-benefits of relocatable modular buildings (RMB) for  construction site offices: the case of Sri Lanka

Abstract

Relocatable Modular Building (RMB) technology is widely utilised worldwide as a versatile solution for temporary shelter needs, including site offices. The substantial cost benefits associated with RMBs have been acknowledged globally. Nevertheless, the lack of empirical data hampers the ability to substantiate the cost advantages of utilising RMB technology. Therefore, the study aimed to find the cost benefits of RMB technology for temporary offices on construction sites in Sri Lanka through Life Cycle Cost Assessment (LCCA). From a methodological perspective, the research adopted a case study strategy. Data was mainly collected through semi-structured interviews, document reviews, and market surveys while following LCCA as the analysis method to derive findings. The findings disclosed that the initial cost of an RMB site office is 32% higher than a conventional site office, but the annual cost saving is 23%. Hence, it is worth investing in RMB because of its yearly cost saving due to its long life span and higher salvage value. Sensitivity analysis further established that employing an RMB is more cost-effective for contractors even at different discount rates, functional lifetimes, and project durations. This study enlightens construction industry practitioners about the cost-effective utilisation of RMBsin their projects.