Dual Occupancy Help

Hi Guys,

My parents, and I would like to buy acres out in the Wollondilly NSW area. We have looked at a few properties but before we buy anything, we need to know we will be able to build a second dwelling either attached or detached.

We know we can build a granny flat or 25% of the main house floor space but it is not something my husband and I would like to live in for a long time. (too small to start a family)

So I guess I was wondering if anyone out there has actually done this? And if they have, your experience with it would be great!

Thank you :)