Originally posted by Khalysto:

Edit: After re-reading your post, it seems you want to install a basement under an existing home.. I do not advise this as the terrain can be a little unpredictable when you're digging it out. It's easy to compromise the foundation of the existing structure. You *can* make it work if you're careful, but I'd recommend building a new structure with the basement as a part of its initial design.

Can confirm, do not do this.
Unless you want to have the easiest way to disassemble your house.....