What is the requirement for the total glazed area for a living area to ensure adequate light?

The requirement for the total glazed area in a living space to ensure adequate natural light is typically set at a minimum of 10% of the floor area. This standard is based on the principle that sufficient daylight is crucial for health and well-being. The 10% guideline means that for every 100 square feet of floor space, there should be at least 10 square feet of windows or other glazed surfaces. This ratio helps to create a bright and inviting indoor environment, which is beneficial for occupants' mental and physical health.

By establishing this minimum, regulations aim to ensure that living spaces are adequately illuminated by natural light, reducing the need for artificial lighting during daylight hours and contributing to energy efficiency. The choice of 10% strikes a balance between enough light without compromising privacy or wall space needed for furniture or storage.