Handrail Extensions for Commercial Stairs

by evstudio on October 22, 2015

Handrail extensions are required for all commercial stairs. Handrails should return to a wall, guardrail or walking surface, or should be continuous to the handrail of an adjacent stair flight or ramp run.  If handrails are not continuous, they should extend a minimum of 12 inches beyond the top riser, and a minimum of 12 inches plus the depth of one tread beyond the bottom riser.  At the top, the handrail extension should be parallel to the ground.  At the bottom, the extension should continue to slope for a distance of the depth of one tread from the bottom riser; the remainder of the extension should be horizontal.

Exceptions include handrails within dwelling units that are not required to be accessible, and aisle handrails in Group A occupancies.

Clear space between handrails and wall surfaces are required to be a minimum of 1.5 inches.  Circular handrails should have an outside diameter of at least 1.25 inches, and no greater than 2 inches.  Non-circular handrails should have a perimeter dimension of at least 4 inches, and no greater than 6.25 inches, with a maximum cross-section dimension of 2.25 inches.

Also keep in mind that guardrails are required along stairways more than 30 inches above grade, and should be a minimum of 42 inches high.

Originally posted 2009-12-21 00:53:56. Republished by Blog Post Promoter

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{ 2 comments… read them below or add one }

Sean O'Hara January 5, 2010 at 12:15 pm

Tony, I think your comment might be a little confusing as it appears that your comment has the same information as the article. I do think that your link has some additional information that may be helpful. Thanks.

Tony January 4, 2010 at 7:55 am

The extension requirement at the bottom of a stair has been changed in the 2004 ADAAG and all current model codes. The requirement is now that the rail end one tread depth beyond the bottom riser.

However, the model codes may have not made it yet into local jurisdictions so all of this should be confirmed before specifying.

view ADAAG excerpt


505.10.3 Bottom Extension at Stairs. At the bottom of a stair flight, handrails shall extend at the slope of the stair flight for a horizontal distance at least equal to one tread depth beyond the last riser nosing. Extension shall return to a wall, guard, or the landing surface, or shall be continuous to the handrail of an adjacent stair flight.

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