What are the stair riser and tread requirements?

Requirements are:

  • In residential use, the maximum riser height is 7 3/4 inches and the minimum tread depth is 10 inches. Tread depth is measured horizontally between the vertical planes of the foremost projection of adjacent treads and at a right angle to the reads leading edge.
  • In other uses, maximum riser height is 7 3/4 inches and minimum tread depth is 10 inches.
  • There shall not be a variation exceeding 3/16 inches in the depth of adjacent treads or in height of adjacent risers. The tolerance between the largest and the smallest riser or the largest and smallest tread shall not exceed 3/8 inches in any flight of stairs.
  • The minimum headroom in all parts of a stairway shall not be less than 6 feet 8 inches measured vertically from the tread nosing or from the floor surface of the landing or platform.
  • For winders, spiral, circular, and other types of stairs - call for requirements.
  • Stairway width and landing width for one and two family dwellings shall not be less than 3 feet.

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1. How long is a permit valid?
2. How many person(s) are allowed per habitable room?
3. Can my roof support the installation of a solar panel?
4. What are the stair riser and tread requirements?
5. When is a guardrail required?
6. When are graspable handrails required?
7. How much frost protection should I have?
8. What R-Values should I insulate to?
9. What are ground snow load and wind speed requirements?
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