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A home energy rating is an estimated calculation into a homes potential energy usage, which will determine the amount of heating and cooling required to make its occupants comfortable. It produces a star rating dependant on the amount of heating and cooling loads which will be required, from 0 to 10 stars.
In most Australian states the government requires that all new homes and apartments (along with certain types of building extensions) built since 2010 be energy rated and achieve a minimum of 6 Stars.
Simple energy rating prices vary greatly on the size and type of building, generally an energy rating will cost somewhere between $130 to $700+.
The information required to complete a full and comprehensive energy report are the following final working drawings: Site Plan, Floor Plan, Elevations, Sections, Lighting layout and window schedule (including sizes of the existing windows).
Depended on the size of the extension you are building there is a chance that it too will need to be energy rated. It's always best to check first before going ahead with construction.
Generally there is a fast turnaround of around 2 working days for simple and straight forward home energy ratings, for larger multi-unit developments there are many factors to consider. Generally we find the slowest part is getting all the correct plans and documents supplied to the energy assessor.