The Cladding Safety Scheme is open to buildings over 11 metres (and up to 18 metres in London) when measured in accordance with the guidance set out on scheme eligibility on gov.uk. The height measurement should be taken from the lowest external ground level to the finished floor level of the top occupied storey. If a building is of varying height, it is the height of the highest residential floor which is relevant when measured in accordance with the instructions provided.