民用工程合同书(28)

　　provided that the contractor shall not be entitled to recover any such extra cost unless he gives written notice of his intention to claim to the employer within twenty - eight days of the employer's order. the employer shall settle and determine such extra payment and/or extension of time under 23 hereof to be made to the contractor in respect of such claim as shall， in the opinion of the employer， be fair and reasonable.
　　if the progress of the works or any part thereof is suspended on the written order of the emloyer and if permission to resume work is not given by the employer within a period of ninety days from the date of suspensing them， unless such suspension is within paragraph （a）， （b）， （c） or （d） of sub（1） of this clause， the contractor may serve a written notice on the employer requiring permission within twenty eight days from the receipt thereof to proceed with the works， or that part thereof in regard to which progress is suspended and， if such permission is not granted within that time ，the contractor by further written notice so served may， but is not bound to， elect or treat the suspension where it affects only part of the works as an omission of such part under 28 hereof， or， where it affects the whole works， as an abandonment of the contract by the employer.
22　commencement time and time for completion
　　the contractor shall commence the works on site within fifteen days of signing the contract， but in any event， not later than two months. the contractor shall commence the work with due expedition and without delay， except as may be expressly sanctioned or ordered by the employer， or be wholly beyond the contractor's control.
　　save insofar as the contract may be prescribed， the extent of portions of the site of which the contractor is to be given possession from time to time and the order in which such portions shall be made available to him and， subject to any requirement in the contract as to the order in which the works shall be executed， the employer will give to the contractor possession of so much of the site as may be required to enable the contractor to commence and proceed with the execution of the works in accordance with the agreed program. if the contractor suffers delay or incurs cost from failure on the part of the employer to give possession， the employer shall grant an extension of time for the completion of the works and certify such sum as， in his opinion， shall be fair to cover the cost incurred.