Mr Crighton,
What, exactly, does "separate" mean?
Now before I get jumped on here, I'm on the outside looking in as far as the NEC goes (being in NZ), but my understanding is that if a structure is not part of the original house foundations, it is "seperate".
Example: You build a brick barbecue one foot from away the house. Is it a structure? Is it "separate"?
My understanding of it would make a seperate structure, it is not part of the house structure, but it has been built in addition to the house on that land.