What is the minimum square footage of glazing required for a bathroom, unless ventilated with a fan?

For a bathroom, unless it is properly ventilated with a mechanical fan, the minimum square footage of glazing required is 3 square feet. This requirement is in place to ensure that there is adequate natural light and ventilation in the space, which is essential for both comfort and health.

The code addresses the need for natural light to prevent moisture buildup and promote a pleasant atmosphere in what is typically a smaller, enclosed area. Proper glazing provides not only light but also a visual connection to the outside, which can improve the overall appeal and usability of the bathroom.

When a bathroom is ventilated with a fan, this requirement can sometimes be adjusted, as a fan can effectively manage moisture levels. However, if a fan is not utilized, the 3 square feet minimum ensures that there is enough natural light to support the bathroom's function. Knowing these standards helps in planning and executing building projects that comply with local codes and enhance user experience.