International Journal of Sustainable Building Technology and Urban Development ISSN:2093-761X(Print) 2093-7628(Online)

The purpose of this study is to propose a sustainable urban form by discovering the correlation and influence relationship between architectural elements, which are characteristic of urban form, and sunlight hours. The results of this study are as follows. First, high-density development has a negative impact on securing sunlight. Therefore, it is necessary to consider and approach the urban form in terms of environmental and energy consumption, including the sunlight, not merely toward high-density cities. Second, a residential area with a low obstruction ratio is advantageous for securing sunlight at the same density. As a result of comparing the cases with similar densities, the case of lowering the obstruction ratio by high-rise and the case of lowering the obstruction ratio by low-rise are all appeared. The residential area through high-rise is suitable for the station area and the area where the high-density development is required. Conversely, the model which lowers the obstruction ratio by low-rise is suitable for the area where the maximum height regulation of the building such as the historic urban region of Europe. Third, it was analyzed that the south-facing plate-type layout of apartment complex has the lowest obstruction ratio and secures the most sunlight hours. In particular, the plate type has a high building coverage but a low obstruction ratio, shows to be advantageous to secure sunlight in various forms. On the other hand, the form of enclosed or clustered is disadvantageous and has a negative effect of forming a shadow by adjacent buildings. Regarding the improvement of the legal system, it is considered to regulate the distance from the adjacent buildings as well as the front. Also, it is suggested that the concept of the obstruction ratio should be applied to the setback regulation.