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Energy and Sustainability Design Consultant Services



Building regulation for energy efficiency was introduced into the Building Code of Australia in 2003. The energy efficiency of residential buildings can be measured using accredited simulation software known as Nationwide House Energy Rating Scheme (NatHERS) software. The software estimates the internal temperature in each room of a dwelling for each hour of the year based on assumptions about occupant behaviour, information about the structure and specification of the dwelling and standard weather data for the dwelling’s location.

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The internal temperature is compared against a comfortable temperature range and occupancy pattern to estimate the annual heating and cooling loads per square metre of floor area to keep the temperature within the comfort range. The loads are adjusted and converted into a star rating between 0 and 10.  A 10-star home is unlikely to need any artificial cooling or heating to maintain comfortable internal conditions, whereas an O star home would offer virtually no protection from the external temperature. The BCA sets a minimum acceptable thermal performance rating by specifying a minimum star rating.

With over 30 years’ experience in Commercial, Residential, Retail, Industrial, Utilities, Aged Care and Multi Unit construction, 10 Star Building Assessments can assist in achieve compliance under the National Construction Code, along with assisting in providing recommendations to improve your rating.

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Thermal energy improvements


Uncontrolled heat loss or gain within a building has a direct link to the amount of energy consumption a dwelling uses.

To determine the compliance with energy efficiency requirements of the building fabric of a residential building, a thermal performance assessment (viz. Energy Rating) must be undertaken.


The thermal performance assessment is a comprehensive evaluation of building envelope performance which includes:

  • Construction materials

  • Window glazing specification and orientation

  • Insulation details

  • Orientation of the building

  • Shading

  • Screening

  • Thermal Mass

  • Climate Zones

  • Wind Direction


10 Star Building Assessments provides detailed analysis of a dwelling, room by room, to see where the greatest heat gains or losses occur. The difference between a 1 star and 6+ star rated building equates to thousands of dollars or tens of thousands of dollars over the life span of a dwelling.


Assessments by 10 Star Building Assessments will provide recommendations and assumed costs or outlays to improve the thermal performance and reduce the energy consumption of a dwelling. The graph to the left demonstrates how important thermal improvement is as up to 40% of a typical energy use is from additional heating and cooling. Projected average home energy use in 2012 — actual energy use varies from state to state (particularly with climate) and from home to home depending on the heating and cooling systems in the home and how they are used.

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