In Australia, the minimum legal height for normal conduct of aerobatics is 3000’AGL. For justifiable reasons – such as competition or display aerobatics - there is a process for getting CASA approval to conduct aerobatics below 3000’.
This involves training and being issued a Flight Activity Endorsement. This can be now be done by any instructor with the appropriate endorsement.
Probably the best website to go to for detailed information on the low-level testing process is David Pilkington’s OzAeros:
For more information contact the WACAAC President.