First of all, define the base area of the building. The simplest case is a rectangular base area.
The base area can also be traced from an imported image of a floor plan.

Steps

Select the Rectangle tool in the Getting started bar.
Alternativly press [R].
Click with the left mouse button on the zero point.
This sets the starting point of the rectangle.
Move the cursor to the right.
A rectangle is spanned and the direction is set.
Set the length and width, separate the values by semi-colon and press [Enter].
For a rectangle of 9,50 * 8,00 type: 9,5;8 [Enter]
You can enter the values directly using the keyboard.
The rectangle is drawn with the dimensions entered.
You can continue drawing rectangles or press [Space].
The spacebar ends the rectangle tool and activates the select tool.

Result

You created a rectangular area that can be used as base area for a building model.
Define the building height in the next step.

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