Greening work involving demolition, alteration or addition of structures or drainage systems, or changes in gross floor area or structure will generally be subject to control under the Building Ordinance.
In a statement today, the Buildings Department clarified that any person who wants to carry out any building works in private buildings should appoint an authorised person to submit plans to the department, unless the works are exempted or considered as minor.
On the roof collapse at City University, the department said it is continuing its investigation and emergency clearance works.
It will collect evidence in a number of areas, including building plan records, the materials, thickness and weight of the rooftop covering, the design and condition of the drainage systems, and the structural condition of the collapsed metal frame.
The department is also contacting people in connection with the incident, including witnesses.
It added that commenting on the cause of the collapse, whether plan submission is required for carrying out the roof greening and the associated liability issues is not appropriate at this stage as the investigation is on-going.
