Section 402. Light

402.1 Habitable spaces.

Every habitable space must have at least 1 window facing directly to the outdoors or to an open court whose facing wall is at least 3 feet (914 mm) away. The minimum total glazed area for every habitable space must be 10% of the floor area of that space.

Exception: Natural light for habitable spaces may be provided through an adjoining room if:

1. the unobstructed opening to the adjoining room is at least 8% of the floor area of the interior space, and

2. the glazed area providing natural light is at least 8% of the combined total floor area being served.

402.2 Common halls and stairways. {As in IPMC}

402.3 Other spaces. {As in IPMC}