Building Energy Rating

Vipac is a certified assessor of building energy efficiency and has been performing thermal comfort, energy, and condensation studies for the past 28 years using both physical and computational analysis techniques. We have conducted assessments demonstrating energy-conscious and environmentally sustainable constructions for end users and the municipality at large.


The design of energy efficient buildings is now seen as highly important by most planning authorities. Energy Audits are becoming standard components in the Development Application of any major new building. Rating Schemes (First Rate, and NatHERS) have been established to assess the energy efficiency of residential developments using a star rating system. Many councils, particularly leading municipal councils in the eastern states, now require Energy Efficiency Ranking be assigned to residential developments at early planning stage.

Vipac are accredited to perform calculations for:

  • First Rate

Vipac also provide practical recommendations to enhance the energy consumption characteristics of proposed residential developments, from single storey houses to high-rise apartment blocks.


For commercial or retail developments, ESPII Energy Audits (DA Stage) are conducted using the ESPII software package. Heating and cooling loads are calculated during early planning stages prior to the specification of any mechanical services such as air conditioning, hot water system, and lighting. Calculated load values are matched to the energy consumption of typical office mechanical services and occupancy patterns. The resulting estimated energy consumption, in MJ/pa/m2, is then compared with specific Council DCP target values. Recommendations are then made to achieve an energy efficient building. In our assessment of energy implications we make recommendations to cover:

  • Site and overall concept
  • Parking
  • Solar access and shading
  • Zoning
  • Wind exposure and ventilation
  • Landscaping
  • Building materials (colouring, glazing)
  • Internal configuration (lighting, thermal insulation, natural ventilation etc.)
  • Building services and appliances (water conservation, hot water provisions)
  • Recycling
  • Construction and demolition

When appropriate, we make recommendations to enhance the energy consumption characteristics for developments, for example, using passive solar principles.