The Simulation method allows for a wider selection of building materials, shading devices and insulation, often reducing the need for improved glazing and other added building costs.
In the Simulation method, you will need to:
- engage an accredited assessor who will simulate the dwelling with an approved software tool; and
- enter the calculated heating and cooling loads from the Assessor Certificate into BASIX.
To pass the thermal performance section using this method, the heating and cooling loads must be below the maximum loads (as calculated by BASIX based on your climate zone). To see the maximum heating and cooling loads that apply to your BASIX project, please refer to the Energy standards and thermal loads calculator.
For further guidance about completing the simulation method, including what councils and certifiers check, please refer to the BASIX Guide: Checking thermal performance for the Simulation method.
The Simulation method is not available for alterations and additions except in special circumstances. Please refer to the guide on using Simulation for alterations and additions.
BASIX Thermal Performance Protocol
The BASIX thermal performance protocol applies to the Simulation method of thermal performance assessment. It establishes requirements for:
- accreditation of organisations that may accredit assessors to conduct simulations, and the accreditation of assessors by such organisations
- software that can be used by accredited assessors to conduct simulations
- how simulations are to be conducted by accredited assessors.
The BASIX thermal performance protocol refers extensively to the requirements in the NatHERS technical notes. It also establishes the hierarchy of interpreting the requirements in conjunction with the NatHERS technical notes. Where there are differences between the protocol and the NatHERS technical notes, protocol requirements prevail.
BASIX Thermal Performance Protocol, 7 June 2024 - Current
This version is for use with the current (V4) BASIX standards.
BASIX Thermal Performance Protocol, 1 October 2023 – Superseded
Do not use this version.
BASIX Thermal Performance Protocol, 27 November 2020- Superseded
This version is only for use if the pre-1 October 2023 (V3) BASIX standards apply to your project.