The Building Commission is aware of concerns about inconsistencies in star ratings being provided by house energy rating scheme assessors for the purpose of demonstrating compliance with the NCC energy efficiency requirements.

In part this appears to be due to a lack of clarity about the use of NatHERS accredited software for the purpose of compliance with the energy efficiency provisions in Part J of the Building Code of Australia (BCA) Volume One and Part 3.12 of BCA Volume Two.

For further information, refer to Industry Bulletin 044.