What is the minimum square footage required for a window in a bathroom for ventilation?

The minimum square footage requirement for a window in a bathroom for ventilation, established by building codes and standards, is typically 3 square feet. This requirement ensures adequate ventilation to help control humidity and prevent mold growth, which is especially important in a bathroom setting where moisture levels can be high.

A window of this size allows for sufficient airflow, contributing to the overall indoor air quality of the space. It is vital to maintain proper ventilation in bathrooms to remove excess moisture generated from showers and baths, thereby enhancing occupant comfort and safety.

Also, building codes often specify that a portion of this window must be operable, meaning that it can be opened to provide ventilation when needed. The requirement of 3 square feet strikes a balance between having enough area for effective ventilation while also being practical in terms of window installation and design within typical bathroom layouts.