The Cladding External Wall System form (EWS1) is not a statutory requirement or government process. It is an industry tool to inform mortgage valuation. RICS has issued guidance on the use and application of these forms, and a surveyor must justify any request for an EWS1 form. The Fire Safety Act 2021 requires all multi-occupancy residential buildings, regardless of height, to have an up-to-date fire risk assessment that, where necessary, includes the external walls. A Fire Risk Assessment of External Walls (FRAEW) done to the PAS 9980 standard developed by the British Standards Institution is the appropriate way to assess that risk in the external wall system.