This report shows the results of a number of building models that compare the energy, cost and greenhouse gas emission reductions of buildings built to Deemed to Satisfy provisions of Section J NCC 2016 with those built to Section J NCC 2019. It was completed as part of the Energy efficiency of commercial buildings Decision RIS on the changes to Section J of NCC Volume One. The views expressed in this report are those of the authors only and should not be construed in any way as having been endorsed, or as representing the views of the ABCB.