NatHERS for existing homes Technical Note (Tech Note). This document sets out the requirements that must be followed when conducting a NatHERS for Existing Homes assessment. Adherence to this Technical Note ensures that NatHERS for existing homes assessments are consistent and can be audited for assurance purposes.
NatHERS Existing Homes Technical Note, 29 October 2025 - Current
This is the latest version of the Existing Homes Technical Note and should be used until further notice.
NatHERS Existing Homes Technical Note, 11 June 2025 (pdf) - Superseded
This version has now been superseded, please use the current version for all future work.
Post date
3 November 2025
Publication categories
Existing Homes