Commercial Energy Rating

Commercial Ratings are for Class 2-9 buildings only.

Every new commercial building development, extension or alteration is required to show compliance with the energy efficiency provisions set out in Section J of the BCA Volume One.

There are several ways to show compliance, they are setout below.


  • Thermal calculation assessments can be used for the residential components (only) of Class 2 and Class 4 buildings.
  • The thermal calculation assessment uses NatHERS second generation rating tools (FirstRate5)


  • If preferred, Sustainability House can provide a DTS report for Section J that assesses each aspect of the proposed building against the requirements of Parts J1-J4 and J6-J8 of the BCA.