好鬼亂
https://www.gov.uk/government/publications/building-safety-programme-estimates-of-ews1-requirements-on-residential-buildings-in-england/building-safety-programme-estimates-of-ews1-requirements-on-residential-buildings-in-england
佢呢到寫 11m以上 如果cladding 有某種物料
或者露台係有火災危險嘅都要做ews1 cert