What is the maximum height of a step (riser) on a stair?

Saturday, February 29, 2020

The maximum height of a riser is 7-3/4 inches according to the International Residential Code (IRC 311.7.5.1), as measured between the leading edges of adjacent treads. Also, the maximum allowable variation between riser heights is 3/8 inch. Also, see our blog post What is the steepest residential stair allowed?

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Here’s links to a collection of our other blog posts about STAIRS:

What do home inspectors check when inspecting stairs?

Is a landing always required at the top and bottom of stairs? 

When is a railing required at stairs?

What is the building code for the minimum height of stair steps (risers)? 

When is a nosing required on a stair tread?

What is the building code requirement for receptacle outlets at stairs and stair landings?  

Are open stair risers acceptable?

What is the steepest residential stair allowed?

Why is a single step dangerous in a house?

 Do I need stairs at all exit doors from a mobile home? 

The stairs feel too steep. What's the building code? 

• What is the longest stair run allowed? 

• What is the lighting requirement for stairs?

• A light is required over a stair after how many steps/risers? 

• When is safety glass required for windows at stairs and stair landings?

   Visit our STAIRS page for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles.

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