应该是有的。
这个别人总结的:
http://www.grannyflatsaustralia.com.au/faq.html
这是政府要求:http://www.planning.nsw.gov.au/p ... _Granny%20Flats.pdf
虽然没有说12米,但是有:
The granny flat meets planning controls
such as building height and setbacks, floor
space ratios, and open space in the local
environmental plan and/or the complying
development provisions in the Affordable
Rental Housing SEPP.