Regulation for Selection and Fee Calculation of Social Welfare Service Providers Entrusted by Entities Article 19

Where it is necessary for an entity to alter part of the content of the entrusted service, the entity may adjust the service fee and the contract period according to the changes on the service items and the quantity.If an entity requests the supplier to execute additional work other than those covered in the contract, an additional fee shall be determined by negotiation between the entity and the supplier.
中文原文 機關委託社會福利服務廠商評選及計費辦法第19條
機關須變更部分委託服務內容時,得就服務事項或數量之增減情形,調整服務費用及工作期限。
機關要求廠商執行契約約定範圍外之工作事項,因此增加之服務費用由機關與廠商另行議定之。

English translation for reference only; the Chinese text prevails. Not legal advice.