Regulations Governing Inspection Visits and Information Registration Article 2

For the applicant whose applying purpose is stay, residency, permanent residency, or registered permanent residence, the National Immigration Agency (hereinafter referred to as “the Agency”) may dispatch personnel, if necessary, to the applicant’s registered residence in Taiwan for an inspection visit within 20 days after receiving such an application.The Agency, if necessary, is entitled to conduct additional visits before a final decision is made on the applicant’s application.
中文原文 內政部入出國及移民署實施查察及查察登記辦法第2條
申請在臺灣地區停留、居留、永久居留或定居者,內政部移民署(以下簡稱移民署)受理後,必要時,得於二十日內派員至申請人在臺灣地區之住(居)所執行查察。
依前項規定執行查察後,為許可或不予許可處分前,必要時,得派員再執行查察。

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