8/16/2019 Ced Bds Stair-Detail
1/3
Building Safety, 1010 Tenth Street, Suite 3100, P.O. Box 642,
Modesto, CA 95353 (209) 577-5232
RESIDENTIAL STAIRWAY AND HANDRAIL REQUIREMENTS
The following i nformation is based on the 2007 California Bu
ilding Code (CBC)
* The rise and run of steps shall be unif orm in size, shape,
and the variation cannotexceed 3/8 inch in the tot al run per CBC
Sectio n 1009.3.2.
* The maximum rise of steps shall b e 7 3/4 inches; the mi nimum
tread depth shall be 10inches. The minimum winder tread depth at
the walk line shall be 10 inches; and theminimum w inder tread
depth shall be 6 inches. A nosin g not less than 3/4 inch b ut
notgreater than 1 1/4 inches shall be pro vided on s tairways with
soli d risers w here the treaddepth is less than 11 inches per CBC
Section 1009.3(4).
* Stairways shall h ave a minimum headroom clearance of 80
inches m easured verticallyfrom a line connecting the edge of the
nosing. Such headroom shall be continuou sabove the stairway to the
point where the line intersects the landing below, one treaddepth
beyond the bottom r iser. The minimum clearance shall be maintained
the full
width of the stairway and landing per CBC Section 1009.2.
* The minimum w idth of stairways shall not b e less than 36
inches. The minimumdimension of all land ings shall be 36 inch es
per CBC Section s 1009.1(1) and 1009.4.
* All stairs having four o r more risers are required to have
handrails and guardrails thatcomply w ith the CBC Sections 1012 and
1013.
* All landings , decks, and balconies that are more than 30
inches above gr ade require abuildin g permit and guardrails that
compl y with all applicable CBC provisio ns.
* The mounting o f handrails shall be such th at the completed
handrail and sup portingstructu re are capable of withstandin g a
load of at least 200 pounds applied in anydirection at any po int
alo ng the top of th e rail per CBC Section 1012.1, 1607.7.1(1),
and1607.7.1.1.
* Handrails shall be continuou s the full length o f the stairs,
from the top riser to th e bottomper CBC Section 1012.5(1).
* Handrails are only permitted to be interrupted by a newel post
at a landing per CBCSection 1012.4(1).
* Handrail height, measured above the stair tread nosin g, shall
be unif orm, not less than34 inches and not mo re than 38 inches
per CBC Section 1012.2.
* Handrails w ith a circ ular cross -section shall have an
outside d iameter of at least 1 1/4inches and no t greater than 2
inches or shall pr ovide equivalent grasp ability. If thehandrail
is not c ircular it shall have a perimeter dimension of at least 4
inches and notgreater than 61/4 inches wit h a maximum
cross-section dimension of 2 1/4 inches. Edgesshall h ave a minimum
radius of 0.01 inch per CBC Sectio n 1012.3.
* Handrails w ith a circ ular cross -section shall have an
outside d iameter of at least 1 1/4inches and no t greater than 2
inches or shall pr ovide equivalent grasp ability. If thehandrail
is not c ircular it shall have a perimeter dimension of at least 4
inches and notgreater than 61/4 inches wit h a maximum
cross-section dimension of 2 1/4 inches. Edgesshall h ave a minimum
radius of 0.01 inch per CBC Sectio n 1012.3.
