u/Fire_Mangos

I am looking to add on to a customer’s house. This will be my first project as a GC. The customer wants to close in their carport but it will be about 3’ off the ground (haven’t measured yet) to meet the existing floor. Where can I find the foundation/footing requirements for something like this?

EDIT: Close in carport for livable space. It will be a living room / office area.