Section 801
SECTION 801. General Requirements of Light and Ventilation. (a) Subject to the provisions of the Civil Code of the Philippines on Basement of Light and View and to the provisions of this part of the Code, every building shall be designed, constructed, and equipped to provide adequate light and ventilation. (b) All buildings shall face a street or public alley or a private street which has been duly approved. (c) No building shall be altered nor arranged so as to reduce the size of any room or the relative area of windows to less than that provided for buildings under this Code, or to create an additional room, unless such additional room conforms to the requirements of this Code. (d) No building shall be enlarged so that the dimensions of the required court or yard would be less than that prescribed for such building.