This paper aims at making the performance-oriented bulk control system for securing the daylight access to the possible adjacent buildings. The performance standard for indoor skylight access enough to make a daily activity such as reading books and its indicator are proposed. In the following study, to evaluate the impact of newly developed building and other buildings on the skylight access to each adjacent building, the idea of the "Imaginary Walls" and "Imaginary Room" are created. In addition, different forms and layouts of the building within the envelope for securing the skylight access are created to examine the effect of the proposed bulk control system. We established the sequential approach that consists of setting of the purpose of the regulation, selection of the indicator, decision of the level of the indicator and production of the building envelope and this helps to make the performance-oriented bulk regulation.
