Members of the Hong Kong Institution of Engineers who are registered professional engineers within the discipline of building services engineering, mechanical engineering, or marine and naval architecture engineering

Members of the Hong Kong Institution of Engineers who are registered professional engineers within the discipline of control, automation and instrumentation engineering, electrical engineering or electronic engineering

Registered lift engineers or escalator engineers represent the interests of lift engineers and escalator engineers

Members of the Hong Kong Institution of Engineers whose names are in the list of engineers contained in the register kept under section 3(2)(b) or (3) of the Building Ordinance (Cap 123)

Persons represent the interests of lift contractors or escalator contractors

Registered lift workers and escalator workers for all kinds of lift and escalator works represent the interests of lift workers and escalator workers

Laypersons represent the interests of persons carrying on the business of property management

Laypersons who are members of management committee, or new management committee, within the meaning of the Building Management Ordinance (Cap 344); or who owns a lift or escalator