Expert: Richard Taylor, AIA - 1/8/2008

Question
QUESTION: We are in the middle of a renovation and are having issues regarding steps outside being built from the courtyard up to the deck.  They are going to be brick.  Is there a standard size height/width for steps?  And should there be an overhang?  Last but not least, if one step is off 1/2 inch from the others should we be concerned?  After they are built we will then be installing a wrought iron handrail.  Thank you

ANSWER: Melissa - thanks for your question!

Yes, building codes are very specific about the "rise and run" of stairs, interior and exterior.  In the current national model building codes (there are 3) the shortest tread dimension (horizontal) allowed is 9"; the tallest riser dimension (vertical) allowed is 8 1/4".  Some jurisdictions require longer treads and shorter risers - you'll have to check your local codes.

A one inch "nosing" (overhang) is required by some codes, not by others.

Typically, riser heights may not vary more than 3/8" in any single run of stairs.  More than that and the stairs become a tripping hazard.

And there are also specific codes about handrail height, baluster spacing, handgrip size, etc...lots to think about!

Hope this helps!

Richard Taylor, AIA
www.rtastudio.com
www.rtaplans.com

---------- FOLLOW-UP ----------

QUESTION: Richard - thanks - just one more question - how would I go about checking our local codes?

Answer
Melissa - simplest way is to call the city (or county) goverment where you live and ask for the building department (sometimes called "building regulations" or something like that).  Talk to a plans examiner - they'll be able to tell you what's required.

If your city or county has a web site it should list contact info for the building department.

Richard Taylor, AIA