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NCC 2019 Energy Efficiency Requirements - WA

April 07, 2020

Members were recently notified that one component of the NCC 2019 energy efficiency changes that was proposed to come into effect this coming May, will be deferred and not apply in WA.

This has now been confirmed with amendments made to the WA Building Regulations. This information sheet provides further detail on the changes and the NCC energy efficiency requirements more broadly.

What has been varied out?

One of the proposed changes for NCC 2019 was for the introduction of separate heating and cooling load limits to be assessed under a NatHERS 6 star assessment.

These provisions were to be introduced for Class 1 and Class 2 buildings under Volume Two clause and Volume One under J0.2.

Regulation 15C of the Building Amendment Regulations (No 2) 2020, varies the relevant NCC provisions out and removes the need for the additional assessment of the heating and cooling load limits under NCC 2019.

What does this mean?

The introduction of the amended Regulations means that under the star rating assessment it will remain as per the process for the assessment under NCC 2016, rather than the heating and cooling load limits be assessed in addition to the star rating assessment and listed on the energy efficiency compliance documentation.

However, what hasn’t changed as per NCC 2016, is that the building will still be required to meet a 6 star assessment or use the Deemed-to-Satisfy elemental provisions for the building fabric or have an equivalent building fabric performance demonstrated through a Performance Solution.

For the star rating assessment this is documented through a ‘Universal Certificate’ that outlines the buildings address, name of assessor, the climate zone the building is located in, the relevant star rating the building achieves and the relevant details of the various components to go into the building to achieve that rating i.e. window glazing performance, minimum roof and wall R-values and insulation values.

Other energy efficiency provisions also apply (regardless of the compliance path used) including for installation of insulation, glazing, building sealing and building services including for heating and air-conditioning, hot water and lighting as set out in the various Parts of 3.12 in Volume Two for houses and Section J for apartments and commercial buildings.

Has any of the other NCC 2019 energy efficiency changes been varied out?


All other energy efficiency changes in NCC 2019, for both Volume One and Two, will apply from 1 May 2020.

This includes the changes to the verification of the reference building method including clarification of acceptable software modelling programs that can and can’t be used and the inputs to be assessed as part of using the method, and the building sealing provisions changes.

For Volume One the commercial building (Class 3 and Class 5-9 buildings) changes which include some quite substantive changes will take effect from 1 May 2020. This includes a new approach to assessment of window and external walls as a combined assessment

Further information about Building and Energy’s Industry Bulletin 128 outlining the amendment.

If you would like to discuss any of this information further contact HIA Building Services team on 1300 650 620 or email