When you first launch the HGTV home design software, it opens a new design project for you. This automatically starts the House Builder Wizard. You can use this wizard to quickly build a basic home structure.
If you are already working with a design and want to start a new project, you can go to the File menu and select the New option. This will also start the House Builder Wizard.
Directions on how to use the House Builder Wizard can be found in this article:
How to use the House Builder Wizard. (KB027005)