This is up to the expert undertaking the assessment, but it must include evidence of the fire performance of materials used in the cladding.
While paperwork submitted by the building's original developer can form part of the evidence, it cannot be solely relied upon. Photo evidence of the cladding will be required, or a physical inspection where this is not available or inconclusive.
In some cases - even where all attempts to establish the cladding system have been taken – the makeup and composition of the external wall system may still be unclear. It may mean that intrusive tests may be required, alongside a more detailed review by a professional of a higher level of expertise. These tests may involve a hole being drilled into the wall or a section of cladding removed to identify the external wall system materials and their composition. It is important to identify the whole make-up of the cladding system and how it has been installed.