http://tinyhouseswoon.com/uhu/ This is Boston’s approach. There are other examples such as IKEA’s flat pack design for refugee housing done in conjunction with the UN. There are a variety of different approaches around the world which can become part of the Australian approach too
Australian Independents Movement for Political Integrity 
http://landscapeaustralia.com/articles/retrofitting-the-suburbs-could-secondary-dwellings-help-the-housing-affordability-crisis/?utm_source=Landscape+Australia&utm_campaign=e1780f4b9b-LA_2017_02_06&utm_medium=email&utm_term=0_99db55805d-e1780f4b9b-41156029&mc_cid=e1780f4b9b&mc_eid=fa4551c1dd This article looks at granny flats in a variety of Sydney regions