Green building rating applications for public sector : the case of National Water Supply and Drainage Board, Sri Lanka

Abstract

The growing global emphasis on sustainable development has highlighted the importance of Green Building Rating Systems (GBRS) in promoting environmentally responsible construction practices. This study evaluates the applicability of major international systems, namely Leadership in Energy and Environmental Design (LEED) and the Building Research Establishment Environmental Assessment Method (BREEAM), in comparison with locally developed frameworks such as GREENSL and the Urban Development Authority (UDA) rating system within the Sri Lankan context. A qualitative research design was adopted, integrating a literature review with semi structured interviews conducted among 15 purposively selected middle-level managers from the National Water Supply and Drainage Board (NWSDB). The findings indicate that international GBRS provide, comprehensive assessment criteria and global recognition; however, they are often expensive and less adaptable to local conditions. Conversely, GREENSL demonstrates, strong contextual relevance, however, limited international recognition. Key challenges identified within the NWSDB include limited technical expertise, high initial costs and bureaucratic delays. Despite these barriers, the study highlights opportunities for capacity development, structured implementation and policy integration towards developing a context specific GBRS model tailored to Sri Lankan public sector organisations. The findings provide a foundation for developing a roadmap showcasing context specific strategies to promote sustainable construction practices within the Sri Lankan public sector.