// CODE SNIPPET
1204.2 Natural Light
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For the purpose of natural lighting, any room is permitted to be considered as a portion of an adjoining room where one-half of the area of the common wall is open and unobstructed and provides an opening of not less than one-tenth of the floor area of the interior room or 25 square feet (2.32 m2), whichever is greater.
Exception: Openings required for natural light shall be permitted to open into a sunroom with thermal isolation or a patio cover where the common wall provides a glazed area of not less than one-tenth of the floor area of the interior room or 20 square feet (1.86 m2), whichever is greater.
Exterior openings required by Section 1204.2 for natural light shall open directly onto a public way, yard or court, as set forth in Section 1205.
Exceptions:
- Required exterior openings are permitted to open into a roofed porch where the porch meets all of the following criteria:1.2. Has a ceiling height of not less than 7 feet (2134 mm).1.3. Has a longer side at least 65 percent open and unobstructed.
- Skylights are not required to open directly onto a public way, yard or court.
Related Code Sections
1204.14 Historic Buildings, Natural Light
Where it is determined by the code official that compliance with the natural light requirements of Section 1010.1 will lead to loss of historic ...
Existing Building Code 2021 of Illinois > 12 Historic Buildings > 1204 Change of Occupancy > 1204.14 Natural Light
1204.14 Historic Buildings, Natural Light
Where it is determined by the code official that compliance with the natural light requirements of Section 1010.1 will lead to loss of historic ...
Existing Building Code 2018 of Illinois > 12 Historic Buildings > 1204 Change of Occupancy > 1204.14 Natural Light
1204.2 Interior Environment, Natural Light
For the purpose of natural lighting, any room is permitted to be considered as a portion ...
1204.2 Interior Environment, Natural Light
For the purpose of natural lighting, any room is permitted to be considered as a portion ...
Section 1204 Interior Environment, Lighting
Every space intended for human occupancy shall be provided with natural light by means of exterior glazed openings in accordance with Section 1204.2 ...