Energy rating is a simple evaluation of the heating and cooling loads which is essential to maintain a comfortable living environment within your building. There are various factors which are taken into consideration, including building size, orientation, climate zone, construction type and insulation. Why is energy rating required for your house? According to the building commission of Australia, all homes going through additions or alterations should have a 6-star energy rating. It is essential to submit the Energy Rating Report prepared by an accredited assessor in order to obtain a building permit. Is energy rating report essential for a renovation or extension? If you are thinking of any alteration or extension requiring a building permit, then energy rating is also essential. For example, if your renovation work represents less than 50% of the original building, then only the renovated section will need to be rated 6 stars. And if there is more 50% renovation sec...