It is possible for a competent BREEAM assessor or AP to carry out the building LCA options appraisals. This is provided that they have had no direct input into the design of the options, and a conflict of interest statement is produced for QA.
As well as outlining how conflicts of interest are managed, this statement must also confirm that the data provided by the design team for the purpose of producing the LCA options has not been altered in any way.