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5 Steps to Determine Occupant Load. Categorize the function for each area without fixed seating using closest category in Table 1004.5. Identify the occupant load factor for each use/area. Note whether the factor is based on gross or net floor area.
A basement area of less than 800 sf within a duplex dwelling unit or as a self-contained dwelling unit may have a single exit of a private interior stair to the upper level of a duplex or to an exit at grade level.
Combustible Materials in Noncombustible Construction (603, 604) • Sections 603 and 604 make limited exceptions for allowing combustible materials in Types I and II construction and in the exterior walls of Types III and IV construction. • Exceptions include insulation, finish flooring, doors, windows, and trim.
Protruding objects are permitted to extend below the minimum ceiling height required by Section 1003.2 where a minimum headroom of 80 inches (2032 mm) is provided over any circulation paths, including walks, corridors, aisles and passageways.
The floor area of basements shall be included in building area where required by Section 506.1.3. Exception: The horizontal area of the portion of any story, mezzanine or loft with a ceiling height of less than 5 feet (1524 mm) shall be excluded from the calculation of building area.
504.1 General. The allowable building height, in feet, and the allowable number of stories above grade plane of a building shall be determined based on the type of construction, occupancy classification and whether there is an automatic sprinkler system installed throughout the building.
To determine whether you can add a basement unit, find your zoning district at The Chicago Zoning Map and see whether you are in a pilot zone. Summary: Under current zoning, single family residences in zones RS-3 and higher can add a second unit.
