The Council in the Moreton Bay region changed their town planning rules on Feb 1st regarding adding a Unit/Granny flat. We managed to get our plans certified on our sons property just before then. The rule from Feb 1 is that you can still build a granny flat but unlike before you now have to have an association with the people renting the unit e.g. family. Also they have tightened up on adding carports at the front of properties.

You would need to check with Council in your area now. Hope this helps!