Who is the best go to department/person to find out firstly what the requirements are to have a pre-existing structure approved to live in and what would be the expected cost. It was I believe the original building before the home was built. I have read a lot of the comments already regarding new granny flat laws and development applications and am still not sure how to find out what the Building Code of Australia's requirements are and other legislation from local council if that's the way to go. It seems there is no clear or consistent information available or I don't know where to look.