80. Events causing initial notice to cease to be in force.

Where a final certificate1 given in respect of work described in an initial notice2 is rejected, the initial notice ceases to be in force in relation to the work described in the final certificate on the expiry of a period of four weeks beginning with the date on which notice of rejection is given3.

Where work described in an initial notice includes the erection, extension or material alteration4 of a building5, and the building or, as the case may be, the extension or any part of the building which has been materially altered is occupied6, and no final certificate is