Faculty of Environmental Design and Management

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Browsing Faculty of Environmental Design and Management by Author "OLAOYE, Folawiyo Timilehin"

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    A Study of Green Building Rating Systems in Lagos state, Nigeria
    (Department of Building, Faculty of Enviromental Design and Management, Obafemi Awolowo University, Ile-Ife, Nigeria., 2023) OLAOYE, Folawiyo Timilehin
    The study examined the Green Building Rating System (GBRS) in use for building projects in Lagos State, Nigeria and their strengths and weaknesses; assessed the importance of the criteria for adapting the Green Building Rating Systems in use; and developed a weighting framework of the criteria for improving the Green Building Rating Systems. These were with a view to enhancing the applicability of the rating systems. The data for the study were collected from primary and secondary sources. Primary data on the rating systems in use, their strengths and weaknesses, their criteria of assessment, and the required criteria for enhancing their applicability to the Nigerian local context were collected during one-on-one interviews conducted on green building experts that were identified from twelve (12) certified green building projects in the study area. A total of eighteen (18) green building experts were invited for interview, and thirteen (13) of them took part in the interview, indicating a 72.2% effective response rate. Secondary data including the criteria checklist of the certification systems which were sourced from their official websites and hand-books, were used to refine and substantiate the primary data. The data obtained were analysed using Thematic analysis, Priority ranking and Fraction Method. The results showed that the most prevalent GBRS in use in the study area were EDGE and LEED. The results further showed the categories used for assessing and certifying buildings in each certification system; the certification process in each certification system; and the building projects that they had certified in the study area. Findings on the strengths and the limitations of the LEED and EDGE certification systems with respect to the local conditions of the study area, showed the major strength of the LEED and EDGE to be used to assess and certify various building types including residential buildings, commercial spaces, and industrial buildings. Both 15 the LEED and EDGE performed well in all the phases of the building project (design, construction, operation and end of life). The only significant limitation in the adoption of the EDGE and LEED was their lack of functionality in the social aspects of sustainability in buildings. The result further revealed the important criteria for adapting the EDGE and LEED to the local context of the study area to include energy efficiency, water efficiency, waste management, pollution and emission and climate and resilience to environmental hazards. The study developed a weighting framework and flowchart representation of the criteria to be considered by the green building experts to enhance the applicability of the rating systems. The study concluded that the EDGE and LEED were sufficient for assessing the environmental aspect of sustainable buildings, but less functional with respect to safety and security, socio-cultural aspects, and Life-cycle cost efficiency.