Height of a Standard Step American architects have chosen a conventional stair height of **7.5 inches** on average. Inside stairs have an average step length of 9 inches, whereas exterior steps have an average step length of **11 inches**. A staircase with 50 steps has an overall height of 150 inches.

Staircase width varies depending on the design but generally is about 16 feet. In order to keep the risers and treads within reasonable weight limits, a narrow staircase will be made of wood. The actual width of a stringer board depends on the quality of the lumber used; it can be as wide as needed to accommodate the number of boards required for the staircase depth. The term "stairway" refers to the entire staircase including landings. The width of a stairway is equal to its rise (height) plus its run (length).

A staircase's angle or pitch determines how steeply it rises. If you were to draw a line from the bottom of one riser to the top of the next, that is called the flight line. The angle between these two lines is called the flight of the staircase. Staircases come in angles of 0 degrees, 15 degrees, 30 degrees, 45 degrees, and 60 degrees. Angles **greater than 60 degrees** are rare because people have trouble walking up them.

Ascendant Heights The step height regulation in the United States should be between 7 and 7 3/4 inches at the maximum, and no less than 4 inches. Other measurements should be taken in accordance with local construction requirements. The maximum step riser height in Canada is 8 1/4 inches. Other measurements should be taken by your local building authority.

The standard step is usually made of wood, but metal or plastic versions are available. Steps can be attached to a wall or placed on **a base plate**. The upper step should be level with or slightly lower than the entrance door sill. The bottom step should be level with or slightly lower than **the doorway threshold**. There should be a clear space of **about 2 inches** around each step.

Children who are very young or who have motor skills issues may need steps equipped with guard rails to prevent them from falling off. Guard rails are also useful for **older adults** who might feel insecure about falling if the guards were not present. Rails can be made of steel or aluminum, but the main body of the step must be wood or plastic.

The recommended step size depends on how old you are. For children under six years old, the steps should be at least 34 inches high and not exceed 48 inches. Older children and adults should use steps that are at least 36 inches high. The larger the step, the easier it is to climb.

The width of the steps varies depending on the style of construction, but for a typical dwelling, the standard is 3 feet, 6 inches (106.7 cm). In most instances, the minimum height is 2 feet 8 inches (81.3 cm). Handrails are needed on both sides of a staircase that is longer than 44 inches (111.8 cm). Stairs are considered a hazard if they do not have handrails.

The standard width of a hallway is 48 inches (122.9 cm), but you should allow **14 inches** (35.5 cm) on each side so that people can pass without touching the walls. A corridor is considered too narrow if it is less than 24 inches (61 cm) wide.

The standard width of a room is 72 inches (182.9 cm), but you should allow **14 inches** (35.5 cm) on **each side** so that people can move around without bumping into furniture or walls. A living room must be at least 5 feet 6 inches (1.7 m) wide; a dining room, 10 feet 6 inches (3.2 m) wide. The maximum length of a hall is 100 feet (30.5 m); the maximum length of a room is 150 feet (45.7 m).

The standard width of a garage is 36 inches (91.4 cm), but you should allow **14 inches** (35.5 cm) on each side so that cars can enter and leave easily.

The stair rise is the height of each individual step. Divide **the overall increase** by the number of steps planned to find the individual stair rise. If the climb is 42 inches (110 cm) and there are 6 steps, each each stair will have a rise of 7 inches (18 cm).

To go up or rise an additional foot or more, add another step. For example, if the first step is 9 inches high, the second step should be 1 foot higher than that, or 10 inches. The rise of **each subsequent step** should be the same as the last.

The rise of a staircase is the total vertical distance from the bottom of one step to the top of the next. It can be calculated by adding together the rises of **all the steps** in the staircase.

For example, if the rise of a staircase is 40 inches (101.5 cm) and it has **12 steps**, then the stair rise is 8 inches (20 cm) per step. To figure out the height of each step, divide **the overall increase** by the number of steps planned. In this case, the increase is 42 inches (1 m), so each step should be 8 inches (20 cm) high.

If the climb is 60 inches (152 cm) and there are 4 steps, each step will be 15 inches (38 cm) high.