..1910.24(b). 1910.24(b). Where fixed stairs are required.. Fixed stairs shall be provided for access from one structure level to another where operations necessitate regular travel between levels, and for access to operating platforms at any equipment which requires attention routinely during operations.
https://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=standards&p_id=9716
The minimum clearance shall be maintained the full width of the stairway and landing. 1009.7.2 Riser height and tread depth. Stair riser heights shall be 7 inches (178mm) maximum and 4 inches (102mm) minimum.
http://www.amezz.com/ibc-stairs-code.htm
Fixed stairways shall be designed and constructed to carry a load of five times the normal live load anticipated but never of less strength than to carry safely a moving concentrated load of 1,000 pounds. 1910.24(d). Stair width.. Fixed stairways shall have a minimum width of 22 inches. 1910.24(e). Angle of stairway rise.. Fixed stairs shall be installed at angles to the horizontal of between 30 deg. and 50 deg.
https://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=standards&p_id=9716
1012.2 Height. Handrail height, measured above stair tread nosing’s, or finish surface of ramp slope, shall be uniform, not less than 34 inches (864 mm) and not more than 38 inches (965 mm). 1012.3.1 Type I.
http://www.amezz.com/ibc-stairs-code.htm
Vertical clearance above any stair tread to an overhead obstruction shall be at least 7 feet measured from the leading edge of the tread. [39 FR 23502, June 27, 1974, as amended at 43 FR 49744, Oct. 24, 1978; 49 FR 5321, Feb. 10, 1984].
https://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=standards&p_id=9716
1009.8 Stairway landings. There shall be a floor or landing at the top and bottom of each stairway. The width of landings shall not be less than the width of the stairway. Where the stairway has a straight run the depth need not exceed 48 inches (1219 mm).
http://www.amezz.com/ibc-stairs-code.htm
2012 International Building Code IBC. 1009.4 Width. The width of stairways shall be determined as specified in section 1005.1, but such width shall not be less than 44 inches (1118mm). see section 1007.3 for accessible means of egress stairways. Exceptions: 1  Stairways serving an occupant load of less than 50 shall have a width of not less than 36 inches (914 mm).
http://www.amezz.com/ibc-stairs-code.htm
Stairway platforms shall be no less than the width of a stairway and a minimum of 30 inches in length measured in the direction of travel. 1910.24(h). Railings and handrails.. Standard railings shall be provided on the open sides of all exposed stairways and stair platforms.
https://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=standards&p_id=9716
Run: Minimum between 9-10 (not counting the part underneath the nosing of the tread above). With a note that runs of over 10 1/2 will usually require three balusters per tread to comply with the 4 maximum opening between spindles.
http://www.woodsthebest.com/Stairs/building-codeUS.htm
Stairs Residential Building Code for the United States. The Stairs-Residential Building Code for the U.S. is a municipal regulation. Thus it varies by state and town. Some jurisdictions base their legislation on the 2000 and 2003 International Residential Code (IRC). Other communities seem to be still using the 1997 Uniform Building Code (UBC).
http://www.woodsthebest.com/Stairs/building-codeUS.htm
minimum stair width code
The minimum width of stair is 44 inches or 1118 millimetre. A minimum stair width code is 44 inches.