Look up Brazen, on the forum. He will let you know if it can/can not be approved, and what needs to be done.
Thanks skater. Here's some critical info for LEGALLY converting an existing space into a granny flat: http://www.grannyflatapprovals.com.au/garage-conversion-guides
To the OP: Read the forum questions and answers at the bottom of the blog articles as well. Many people have asked the same questions as you.
Brazen.