Building codes require a window area not less than what percentage of total floor area?

The requirement for window area as a percentage of total floor area is crucial for ensuring adequate natural light and ventilation within living spaces. Building codes typically specify that the window area must account for at least 8% of the total floor area. This percentage is established to promote a healthy indoor environment, which contributes to occupant comfort and wellbeing. Adequate window area helps reduce reliance on artificial lighting during the day and supports natural ventilation, which is particularly important in residential buildings.

The choice of 8% is based on a balance between allowing sufficient natural light while also accounting for structural and aesthetic considerations in building design. This standard can vary depending on specific local regulations or amendments, but generally, 8% is recognized as a minimum threshold in many building codes.