This study aims to analyze the construction of ganggam bauntuak as a form of control over harato pusako tinggi and to determine the normative limits of its reinterpretation in the practice of transferring ancestral property from the perspective of Islamic law. This study employs normative legal research using statutory and conceptual approaches. Legal materials were analyzed qualitatively through deductive reasoning by applying the concepts of ganggam bauntuak, harato pusako tinggi, ‘urf, maslahah, and hifz al-mal. The findings indicate that ganggam bauntuak constitutes a right of control and utilization over harato pusako tinggi and does not constitute individual ownership because the property remains within the collective structure and interests of the clan. Its reinterpretation may be accepted insofar as the change concerns the management and utilization of the property without eliminating the clan’s legal relationship with it. Conversely, reinterpretation that transforms individual control into absolute ownership and unrestricted authority to transfer the property exceeds the permissible limits under Islamic law. The analysis through ‘urf, maslahah, and hifz al-mal demonstrates that repeated social practices do not automatically constitute legal legitimacy when they eliminate collective rights, undermine the clan’s collective welfare, and threaten the continuity of harato pusako tinggi.
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