Social Worker Act Article 21

In order to establish a social worker office, a social worker shall fill in an application, prepare relevant documents and data, and then apply for permitting and registering by the competent authority of the municipality or county (city) where he is located and finally establish the office after being granted a business license.A social worker who applies for establishing a social worker office prescribed in the preceding paragraph shall have engaged in the business prescribed in Article 12 for more than five years and also have work record evidence.
中文原文 社會工作師法第21條
社會工作師事務所之設立,應由社會工作師填具申請書,並檢具相關文件及資料,向所在地直轄市或縣(市)主管機關申請核准登記,發給開業執照,始得為之。
前項申請設立社會工作師事務所之社會工作師,須執行第十二條所訂之業務五年以上,並得有工作證明者,始得為之。

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