This research aims to analyze the law of living at home with adult in-laws from a sadd al-dzarī‘ah perspective and formulate preventive measures in conditions that require living together. This issue is important to study because in-laws are not mahram, while living in the same house can increase the intensity of interactions and open up opportunities for khalwat, slander and mafsadah. This research is normative legal research with a conceptual approach. Legal materials are obtained through literature studies which include the Al-Qur'an, hadith, books of jurisprudence and ushul fiqh, books, journals, and relevant previous research. The analysis was carried out descriptively-analytically with a deductive pattern based on the sadd al-dzarī‘ah concept of Ibn Qayyim al-Jauziyyah and Imam al-Syathibi. The research results show that living in the same house as an adult sibling-in-law is basically permissible, but can become a dzarī'ah towards mafsadah if it continues continuously and is not accompanied by adequate interaction limits. Therefore, this condition should be avoided if the potential for harm is greater than the benefit. However, in the case of hājah mu'tabarah, living in the same house can still be tolerated by implementing preventive measures, such as protecting the private parts, avoiding seclusion, limiting interactions, and providing a separate living space.
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