Real Estate Appraiser Act Article 19

Practical rules in respect of real estate appraisal, including procedures, methods and other related matters, to be followed in appraising real estate shall be instituted by the competent central authority.A Real Estate Appraiser should follow the rules stated in Paragraph I of this Article and other regulations set up by the competent central authority to complete an appraisal report with his / her signature on it before giving the report to a client.A Real Estate Appraiser shall keep his / her contracts with clients and commissioned appraisal reports for at least fifteen years.
中文原文 不動產估價師法第19條
不動產估價之作業程序、方法及估價時應遵行事項等技術規則,由中央主管機關定之。
不動產估價師受託辦理估價,應依前項技術規則及中央主管機關之規定製作估價報告書,於簽名後交付委託人。
不動產估價師對於委託估價案件之委託書及估價工作記錄資料應至少保存十五年。

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