This KBCN has been withdrawn and is no longer valid.
This is because there are now LCA tools that can be used to address Parts 2 and 3. This is reflected in the relevant Mat 01 tool.
KBCN withdrawn on 19/11/2020: The elements listed as relevant for Parts 2 and 3 are not covered by any LCA tools approved by BRE at the moment. Tools other than IMPACT that may cover more elements can be used in the future, once they have been submitted to BREEAM for evaluation.