- The whole or part of one side of one or more rooms shall abut an interior open space whose minimum width in all directions shall be 3.0 m in case of buildings not more than 15 m in height unless mechanically ventilated.
- Sunken Courtyard: Sunken courtyard as a ‘light well’ within the building envelop shall be permitted for light and ventilation for basement area.
- Skylight: Skylight in interior open space(courtyard) may be permitted subject to it may not act as a coverage space on the ground floor and not violate the maximum/ minimum ground coverage norms.