There is a separate Stairs Extension that contains tools for drawing stairs, landings, and railings of different sorts. Downloading and installing this Extension will add two separate component tabs to CET: Commercial Stairs with components suitable for office and home environments, and Industrial Stairs with stairs for industry and storage sectors.

Items from the Commercial Stairs tab                            Items from the Industrial Stairs tab

How to Insert Stairs

To simply place the stairs, a single click upon inserting the Stairs would place the default dimensions of the Stairs.

While inserting the stairs, you can also hold left-click and:

• drag up/down the stairs would alter the total run for the top/bottom side of the stairs.
• rotate (move the mouse to the side of the stairs) would insert the default Stairs dimensions but with the ability to rotate.

The 'blue riser' at the top of the Stairs indicates where the Landings can be placed. Besides that, it can also act as a guideline when connecting it to another level/floor.

Multiple stairs can be attached to the same side of a landing with 2 clicks. The 1st is to snap the stairs to the landing while the 2nd click is to confirm placement after specifying the direction of the stairs in the Quick Property box.

Railings are automatically added to Industrial Stairs that follow building codes while 'Custom' stairs are placed without railings.

Properties

You can alter the dimensions in the Quick Property box during and after inserting the Stairs. You will get more options after inserting the Stair.

Insert Mode: Custom or Automatic (Default). This follows the Building Code Standards option, the default is Automatic which follows the option you chose in the dropdown menu over at the Stairs components tab. 

Total Rise, Total Run: The measurement of the total height and depth of each step respectively as shown in the image below.

Run Width: The width of each step.

Number of Steps: Total number of steps for the selected Stairs.

Code Standard: Greyed out. Follows the Code chosen during insert.

Tread Height & Depth: The dimension of each step's height and depth. Greyed out. Follows the Total Rise & Run.

Stairs Style: Open Base / Closed Base / Open Raiser / Flushed. Refer to the following images.

Show Stringer: Adds the housing on either side of the Stairs.

Show Upward Arrow: Shows the Stairs direction in the 2D drawing view.

Show Upward Text: Shows the 'Up' text in the 2D drawing view.

Building Code Standards

Looking at each of the Stairs types, you have been given the option to choose the Building Code Standards right off the bat.

For Commercial Stairs, you can either choose an IBC 2015 code or customize your stairs.

However, for Industrial Stairs, additional Building Code Standards are given, including OSHA and ISO 14122.

Besides that, you also have the ability to auto-insert railings for Industrial Stairs.

Industrial Stairs

Besides that, Industrial Stairs also has more symbols to work with, such as Ladders, more Landings  & Supports, and Materials selection for the steps.