Has anyone here had a foundation dug out?

I'm looking at moving a house onto a lot but would need to add a foundation first. I figured if I am going to take the trouble to do it, a basement would be nice.

Has anyone done something similar? If so how much did it run you? Any companies I should avoid?

Slightly good news is a family member could actually DIG the dirt out but the rest im not 100% on. So I wouldnt have to pay for excavation.

Location would be over in 2C but wanted to hit the larger subreddit.