(1) Where an application for permission to develop land is duly made to the Head of the Physical Planning and Development Division, the Head of the Physical Planning and Development Division shall give a decision within a period of 90 days from the date of receipt of the application or such extended period as may be agreed upon in writing between the applicant and the Head of the Physical Planning and Development Division.
(2) Unless the Head of the Physical Planning and Development Division gives a decision within the period prescribed by subsection (1)—
(a) in the case of an application for the erection of or any other building operations to be carried out on or in relation to a single-family dwelling house, permission shall be deemed for all purposes to have been granted unconditionally by the Head of the Physical Planning and Development Division at the expiration of such period or the last of such extended periods; and
(b) in all cases other than those mentioned in paragraph (a), the provisions of section 26 shall apply in relation to the application as if it had been refused by the Head of the Physical Planning and Development Division.