Can I include Website Builder into my theme?

Visual Composer Website Builder has a Free version that can be included in a theme completely free of charge.

Visual Composer Premium version can be included in themes which are sold on Envato market. For the Premium version, there are several packages available based on the theme user count. You can always upgrade your theme integration license type as your theme grows in terms of popularity.

To learn more about theme integration, visit Theme Integration page.