Software Standardisation and Specification Document for existing homes

Existing home
Software and rating tools

This document specifies the data sets, fixed inputs and validation rules that User Interface tools must apply for existing homes.

It supports consistency and accuracy in existing home assessments and defines the settings that differ from those used for new homes.

This document supplements the NatHERS User Interface Protocol for existing homes and must be read in conjunction with:

Documents
NatHERS Software Standardisation and Specification Document for existing homes - July 2026

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NatHERS Software Standardisation and Specification Document for existing homes.pdf (1.35 MB)
Appendix 2 - NatHERS Software Standardisation and Specification Document for existing homes - July 2026

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Appendix 2 - NatHERS Software Standardisation and Specification Document for existing homes 20260701.xlsx (68.27 KB)
Superseded
NatHERS for existing homes Thermal Standardisation and Specification Document - May 2025

Download

NatHERS for existing homes Thermal Standardisation and Specification Document v20250520.pdf (1.78 MB)
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