Independent third party
The Home Quality Mark One, Technical Manual SD239, England, Scotland & Wales, published by BRE in 2018, suggests that for the purpose of the Home Quality Mark, an independent third party is:
'An individual or group of individuals, who are not involved in any other aspects of the project (for example, design, construction or management of the assessed home), to ensure they are providing independent verification of the quality assurance processes. For example, this could be an organisation employed by the developer or main contractor, or they could be a client representative (such as a clerk of works) where the client is not also the developer.'
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