We're considering converting our single car attached to a bedroom/bath. I have a few questions about the foundation. 1.) How do we determine if the current garage has a foundation and is not just a slab? 2.) Do we necessarily need the garage to have a foundation or can the current space be converted as is assuming there is just a slab (we'll have to raise the floors using 2x's anyway) 3.) If the garage needs a foundation, could you build the floor as you would a deck and attach a ledger and drill holes for posts, etc.?