External obstructions and daylighting in high-rise residential buildings

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)29-36
Journal / PublicationInternational Journal for Housing Science and Its Applications
Issue number1
Publication statusPublished - 1999


The extent of sky obstruction due to neighbouring buildings was investigated for high-rise residential buildings in Hong Kong. A total of 275 residential buildings completed during the month of June between 1985 and 1995 were selected for the study. The percentages of sky obstruction for different floor levels were estimated through site surveys and subsequent analysis. It has been found that sky obstruction due to neighbouring buildings can be severe for residential flats on the lower floors. The smallest and the largest sky obstructions are 10 and 80%, respectively. Most (about 65%) of the buildings have average sky obstructions between 30 and 60%. Impacts of external obstruction on the indoor daylighting levels were examined. It has been found that residential flats with 50% or more sky obstruction tend to have inadequate natural daylight and would have to rely on supplementary artificial lighting for areas away from the windows.