Green-building information modelling (Green-BIM) assessment framework for evaluating sustainability performance of building projects: a case of Nigeria

There is a research gap in the use of digital systems to aid the sustainability performance assessment of buildings, which informs the development of the green-BIM assessment (GBA) framework in this paper. The study employed a conceptual framework design, expert surveys, and case studies to identify and establish the different components of the GBA framework. The developed GBA framework incorporates the BSAM scheme as its primary green building rating system and provides a cost-effective solution for sustainability appraisal. The findings revealed that the 4Ws of the information exchange workflows would facilitate the GBA system's implementation and the expert validation confirmed its suitability for the Nigerian context. The C-SDSS served as the digital component of the GBA system towards automating the sustainability performance assessment of buildings. The GBA system provides the construction industry with a useful tool that could ease comparing two or more building projects or its designs for several uses - such as contract bidding, evaluating alternative designs, and the like. The application of the GBA system can be extended to facilitate its adoption in other regions or countries. The study's deliverables are expected to enhance smart and eco-initiatives in Nigeria and sub-Saharan Africa.