The simulation method allows for a wider selection of building materials, shading devices and insulation, which may reduce 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
- enter the calculated heating and cooling loads from the NatHERS assessor certificate into BASIX.
More information on Using the simulation method.
Meeting thermal performance requirements
To meet the thermal performance requirements using this method, the heating and cooling loads must be less than 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 thermal performance Simulation method and specifies how simulations are to be conducted by accredited assessors.
The protocol also refers to similar requirements in the NatHERS Technical Note and explains how they interact. Where there are differences between the protocol and the NatHERS Technical Note, the 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BASIX Thermal Performance Protocol, 1 October 2023 – Superseded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BASIX Thermal Performance Protocol, 27 November 2020- Superseded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.