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Part J (Section J) Energy Efficiency

Section J, also known as Part J, is the energy efficient chapter and requirements in the Building Code of Australia (BCA) for commercial buildings, classes 2 - 9. It does not apply to residential buildings.

Section J comprises of the following:

Part J1 - Building Fabric

  • Roof and Ceiling Construction
  • Roof Lights
  • Walls
  • Floors

(In most cases, insulation, walls and roof insulation, is required to keep the temperature in a building less prone to outside temperature fluctuations.)

Part J2 - External Glazing

  • Two methods for checking compliance subject to class of building
  • Shading is also important

Part J3 - Building Sealing

  • Chimneys and flues
  • Roof lights
  • Windows and doors
  • Exhaust fans
  • Construction of roofs, walls and floors

Part J4 - Air Movement

  • Generally applicable for multi-residential buildings

(This part requires that the openable window area equals or exceed a certain 5% of floor area.)

Part J5 - Air-conditioning and Ventilation Systems

  • Air-conditioning and ventilation systems
  • Efficiency of Air-conditioning systems
  • Time switch
  • Heating and chilling systems
  • Miscellaneous exhaust systems

(Energy efficient air conditioning and ventilation systems with proper controls (like the inexpensive time switches, thermostats) are required to pass the requirements.)

Part J6 - Artificial lighting and power

  • Interior artificial lighting
  • Interior artificial lighting and power control
  • Interior decorative and display lighting
  • Artificial lighting around the perimeter of a building
  • Boiling water and chilled water storage units

(Simply speaking, you need good energy efficient lightings, time switches and motion detectors to comply. Normal light bulb in most cases will not comply.)

Part J7 - Hot water supply

(Need a proper energy efficient system to comply with a micro-processor based system)

Part J8 - Access for Maintenance

(Just allow access to repair and fix equipment and components.)

Efficient Energy Choices has carried out Section J assessments and reports for numerous building classes such as: schools, caf├®, offices, medical centres, retail, factories and multi-unit developments. We have been able to save our building designers and builders thousands of dollars through intelligent designs and competitive prices. If you need any assistance, please feel free to contact us.