A stair tread should be a minimum of 11″ deep for stairs used as a means of egress under the 2018 IBC building code. A stair tread should be a minimum 9.5″ deep for stairs used as equipment access under the OSHA standards for stairways.

What is code for step depth?

The tread depth code for residential stairs should be no less than 10 inches with nosing, no less than 11 inches without nosing, and maximum tread depth variation should also be less than 3/8 of an inch.

How deep is a step?

The depth (also called tread or run) of each step should be a minimum of 10 or 11 inches depending on the type of stairs.

What is the standard size of a stair step?

The general rule (in the US) is 7-11 (a 7 inch rise and 11 inch run) (17.78cm-27.94cm). More exactly, no more than 7 3/4 inches (19.7cm) for the riser (vertical) and a minimum of 10 inches (25.4cm) for the tread (horizontal or step). You can find some more information here as well on other stair-related dimensions.

What is the minimum stair width?

Riser height shall be from 6 to 7.5 inches (15.24 to 19.05 cm), stair width a minimum of 22 inches (55.88 cm) between vertical barriers, tread depth a minimum of 12±2 inches (30.48±5.08 cm), and tread nosing shall be straight leading edges.

At what height is a step required?

In the United States, the step height standard should be between 7 or 7 ¾ inches at the most, and no less than 4 inches. You should follow other measurements if given by local building codes. In Canada, the maximum step riser height is 8 ¼ inches.

Can you have a single step?

You can have that single step in the landing and yes, we do regulate that height.

What is a standard step tread?

A standard number of treads in a stair between first and second floors is 14. One hundred-five divided by 14 equals 7 1/2. That means the distance from the top of each step to the top of the next step will be 7 1/2 inches. With a riser height of 7 1/2 inches, tread width (run) should be at least 9 inches.

What is the average width of a step?

The width of the tread will determine how much of the stair is covered. Stair treads can be as narrow as 22.5 inches or as wide as 36 inches. Wider stair treads are typically used outdoors while narrower designs between 22.5 inches and 30 inches are more commonly used indoors.

How deep is a standard stair tread?

Staircase Tread (Run) Depth: 10 to 11 Inches, Minimum However, if the steps do not have nosings, and the steps have solid risers, not open risers, the minimum tread depth is 11 inches. Staircase risers should be adequately deep to allow a majority of your foot to have enough room to rest on the stair.

How narrow can a staircase be?

Stairways shall not be less than 36 inches (914 mm) in clear width at all points above the permitted handrail height and below the required headroom height PHOTO 1.