This Protocol describes the processes that Assessor Accrediting Organisations (AAOs) must undertake once approved by the NatHERS Administrator. AAOs accredit NatHERS Assessors to conduct energy rating assessments for regulatory purposes.

The current version of the AAO Protocol was released in September 2022.

Protocol for Assessor Accrediting Organisation - September 2022 - current

Previous versions:

Protocol for Assessor Accrediting Organisations – October 2021 [PDF 952 KB] - superseded

Protocol for Assessor Accrediting Organisations – March 2016 (July 2020 update)  [PDF 718 KB] - superseded

Protocol for Assessor Accrediting Organisations – March 2016 [PDF 429 KB] - superseded

Protocol for Assessor Accrediting Organisations – March 2014 [PDF 411 KB] - superseded