(1)  If, at the time when work is completed, the cost of the work at completion is higher than the estimated cost of the work used to calculate a person's liability to pay the building administration fee under this Division, the person must inform the Director of Building Control, within the specified period after completing the work, of the cost of the work at completion.

(2)  A person who has paid the building administration fee in respect of work may be liable to pay an additional amount of the building administration fee in respect of the work if the cost of the work at completion is higher than the estimated cost of the work used to calculate the building administration fee as previously paid for the work.

(3)  A person who was not previously liable to pay the building administration fee in respect of work, due to the estimated cost of the work being lower than the applicable amount under section 296(2) , may be liable to pay the building administration fee in respect of the work if the cost of the work at completion is equal to or higher than the applicable amount.

(4)  The Director of Building Control –

(a) may, within the 12-month period after the completion of the work referred to in subsection (2) or (3)  –

(i) calculate the building administration fee for the work using the cost of the work at completion; and

(ii) require the person referred to in subsection (2) or (3) to pay the difference between the building administration fee calculated under subparagraph (i) and the building administration fee paid in respect of the work by the person, if any; and

(b) is to notify the person referred to in subsection (2) or (3) in writing that an additional amount of the building administration fee is to be paid in accordance with the written notice.

(5)  A person referred to in subsection (2) or (3) is liable to pay any additional amount of the building administration fee specified in a written notice given to the person under subsection (4)(b) .