Stair width and landing requirements
Standard residential stair width: 36-40 inches. Landing dimensions: at least equal to stair width.
Width and landing are the other half of staircase sizing. Set by code minimum and refined by comfort.
In this guide
- 1
Stair width
Standard residential: 36-40 inches. Code minimum (IRC): 36 inches typical. Comfortable: 40 inches. Wider feels grander: 48+ inches is generous, often used in formal staircases. Measured between handrails.
- 2
Landing dimensions
Minimum landing depth (direction of travel): equal to stair width. A 36-inch stair needs 36-inch landing. Landing width: at least stair width. Headroom above landing: 6'8" minimum.
- 3
Headroom above stairs
Minimum: 6'8" (80 inches) above leading edge of each step — measured straight up from nose of each tread.
Frequently asked questions
How wide does a residential staircase need to be?
36 inches minimum (IRC); 36-40 inches typical; 48+ for generous formal staircases.
How big should a stair landing be?
At least as deep and as wide as the stair itself. A 36-inch wide stair needs a 36×36-inch landing minimum.
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