The greatest tread depth within any flight of stairs shall not exceed the smallest by more than 3/8”.ĥ. 
The greatest riser height within any flight of stairs shall not exceed the smallest by more than 3/8”.Ĥ. The riser shall be measured vertically between leading edges of the adjacent treads. Handrails shall not project more than 4.5” on either side of the stairway and the minimum clear width of the stairway at and below the handrail height, including treads and landings, shall not be less than 31.5” where a handrail is installed on one side and 2” where handrails are provided on both sides.ģ. Stairs shall be a minimum width of 3’ x 3’ (36 inches). The minimum size of each landing shall not be less than 36” x 36”.Ģ. The landing width should include the width of both doors, regardless if one panel is fixed or not. If sliding glass or French doors are installed, Landing width shall not be less than the width of the door(s) served. Exterior landings shall not be more than 7 ¾” below the top of the threshold, as long as the door other than the storm does not swing over the landing. (other than storm) does not swing over the doorway. **Exceptions: **A stairway of two or few risers is not required to have a landing on the outside as long as door The landing shall be permitted to have a slope not to exceed 2%. 
The floor or landing at the exterior door shall not be more than 1.5” lower than the top of the threshold.There shall be a landing on each side of exterior doors.
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Please consult the code for further detailed information.ġ. The following information is provided from the International Residential Code (06’ Version) which is the adopted building code for residential construction in Delaware. We are not Code enforcement, but for those that like to follow the code, I have this to help.Įxterior Stair Code Requirements If this thing fails, you fall how many inches?
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