Section 99 of the Principal Act is amended as follows:(a) by inserting in subsection (4) "at least 5 business days before the expiry of that period" after "relevant building surveyor" ;(b) by inserting the following subsection after subsection (4) :(4A) If the Director of Building Control has determined that special circumstances exist, a building surveyor may give written approval under subsection (4) whether or not that approval is given at least 5 business days before the expiry of the period specified in that subsection.