The Technical Note provides a standardised approach to rating a dwelling. It details the requirements that must be followed for a NatHERS assessment in regulation mode when demonstrating compliance with the NCC.

NatHERS Technical Note, 1 September 2022 - effective from 1 October 2022

This version is for use with software using Chenath engine V3.22 only.

Key changes include the addition of thermal bridging and appliances.

NatHERS Technical Note, 1 June 2019 - current 

This version is for use with software using Chenath engine V3.21 only.

NatHERS Technical Note, 1 May 2019 - superseded

This version is for use with software using Chenath engine V3.21 only.

NatHERS Technical Note V1.2, 1 October 2014 - superseded

This version is for use with software using Chenath engine V3.13 only. See also: 

• Zoning guide for the Technical Note 1.2 (2014) 
• Technical Note 1.2 Assessor Questions and Answers

NatHERS Technical Note V1.1, 2013, and Addendum 1.2013 - superseded