—(1) Subject to paragraph (2), these Regulations shall apply only to any of the following building works in respect of which an application for planning permission is submitted to the competent authority under the Planning Act (Cap. 232) on or after 15th April 2008:
building works which involve a gross floor area of 2,000 square metres or more;
building works which involve increasing the gross floor area of an existing building by 2,000 square metres or more;
building works relating to an existing building which involve a gross floor area of 2,000 square metres or more.
(2) Notwithstanding paragraph (1)(c), these Regulations shall not apply to any building works consisting of repairs or alterations to an existing building unless those building works involve the provision, extension or substantial alteration of the building envelope and building services in or in connection with an existing building.