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This document forms an addendum to the Trajectory for Low Energy Buildings and outlines the opportunities for improving existing buildings, both commercial and residential.

The Nationwide House Energy Rating Scheme, or NatHERS, is being expanded to include Whole of Home assessments and ratings to support the proposed National Construction Code energy efficiency requirements for residential buildings in 2022; the changes will help households improve a home's energy efficiency and reduce energy use, which provides a range of benefits including lower energy bills, improved comfort and health for occupants, and reduced carbon emissions.

The Strategy is the culmination of considerable analysis, consultation with experts, industry and the public, and an extensive body of original research.