don't go too far. what kind of structure do you have? framed, block?
do it all the time in europe, but here, you have a lot of framed homes. real question is: at what point does the length of the cantilevered deck become a wing and pick up enough wind to either get ripped from the building, or worse, get ripped from the building and take part of the building with it (in the event of a serious wind). check out these websites: