The prevalence of modern residential buildings without adequate consideration of changes in user's needs and preferences in urban centres of South-eastern Nigeria is becoming more worrisome. This study therefore, evaluated the level of knowledge and implementation of bioclimatic principles/practices in modern residential buildings by building design and construction professionals. It assessed the adequacy of bioclimatic elements and occupant level of satisfaction based on selected environmental

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... performance criteria. It employed survey approach and analysed the survey data using mean score index, correlation coefficient and t-test statistics. The result showed a low level of implementation of bioclimatic principles/practices in spite of high level of knowledge about bioclimatic principles/practices by the building professionals. It also found that bioclimatic elements/features in modern residential buildings were inadequate and thus, high level of occupants' dissatisfaction with environmental performance of the buildings. The study further found that adequacy of bioclimatic elements was significantly and positively correlated with the level of implementation of bioclimatic principles/practices and occupants' level of satisfaction. However, a moderate and insignificant positive relationship was found between the level of knowledge and implementation of bioclimatic principles/practices. This therefore, suggested a need for building professionals to transform their knowledge of bioclimatic principles into practice for an improved performance. This would create a balance between traditional values and modernisation and a more comfortable home for living. The study then advocated for a revisit to existing building design and construction laws, policies and codes, and/or institutionalising new regulations that would accommodate bioclimatic peculiarities of South-eastern Nigeria. a significant impact on the environment including climate change [2] . Specifically, around 40% of energy is consumed in buildings worldwide today with more new buildings being built everyday [3, 4] .