What is the minimum size required for a window in a bathroom if there is no mechanical ventilation?

In Virginia, the minimum size requirement for a window in a bathroom without mechanical ventilation is 3 square feet. This requirement is established primarily for safety and health reasons, ensuring adequate natural light and ventilation to reduce humidity and improve air quality.

A window of this size allows for sufficient airflow when opened, which is essential in a room that is frequently exposed to moisture from showers and baths. This dimension helps to alleviate the buildup of humidity and moisture that could lead to mold and mildew growth, thus promoting a healthier living environment.

In contrast, sizes smaller than 3 square feet would likely not provide enough ventilation or light, making it insufficient for proper bathroom use. On the other hand, larger windows could be beneficial but are not the minimum standard set for regulatory purposes.