adding water tanks, canopies, shelters, structural frames for advertisement signboards, air-conditioning plants, etc.installing cladding or curtain wall to the façade of existing buildings.conversion of an existing building, including wholesale conversion of an existing industrial building.combining two or more units into one by removing the partition walls.linking two or more floors by removing parts of the floor slab and/or adding internal staircases.constructing a new extension, vertically or horizontally, to an existing building.Examples of A&A works to existing building are: Any person who intends to carry out alterations and additions works (A&A works) is advised to consult Building Professionals for advice and make formal application for approval and consent from the Building Authority.