When an employer undertakes a public works project, the project authority (institution) issues a project duration extension certificate and the employer needs to hire foreign workers during the extended duration, an application should be made to the Central Competent Authority for an employment permit extension within 14~120 days before the expiration of the original employment permit.If a private institution undertakes itself or invests in a major private construction project when the competent authority in charge of the target business issues a project duration extension certificate and the employer needs to employ foreign workers during the extended project duration an application should be made to the Central Competent Authority for an employment permit extension 14~120 days prior to the expiration of the original employment permit.The number of foreign workers allowed to be hired during the project duration extension referred to in the previous two paragraphs shall be recalculated by the Central Competent Authority based on the original project duration plus the extended project duration, pursuant to the provisions of Addendum 9, Article 44, but cannot exceed the number of workers employed on the initial recruitment permit issued by the Central Competent Authority.The extended employment permit period for foreign workers referred to in Paragraph 1 and Paragraph 2 can be no longer than the extended project duration. Moreover, the employment permit period plus the extended employment permit period can be no longer than three years.Addendum 9：Project Finance Methodology and Demand Model Calculation Formula.PDF