How to Calculate the Natural Light and Ventilation Requirements per the Residential Code

Per the International Residential Code, certain rooms within dwellings must be provided with a minimum amount of lighting and ventilation. Section R303 of the International Residential Code (IRC) outlines the requirements to achieve compliance.

The following rooms are considered Habitable:

• Bedrooms
• Living Rooms
• Dining Rooms
• Kitchens
• Family Rooms/Den
• Similar Areas

These spaces are occupied for the majority of the time. Even though toilet rooms, closets, hallway, and similar areas can also be occupied, these spaces are typically considered accessory to the main use and are used when the habitable spaces are occupied.

Now even though Bathrooms are not considered a Habitable Space by the code, there still are some light and ventilation requirements for Bathrooms.

CLICK HERE to learn more