PRAKTIK JUAL-BELI PADA BANK SAMPAH “SAMI BERKAH” METESEH SEMARANG DALAM PERSPEKTIF HUKUM ISLAMNIM.: 22103080107Ahmad MustajabauthorThis study examines the practice of buying and selling at the "Sami Berkah" Waste Bank in Meteseh, Semarang, from the perspective of Islamic law as a form of muʿāmalah transaction that transforms waste into an economically valuable commodity. The study focuses on the transaction mechanism, which includes waste collection, weighing, price determination, transaction recording, and payment procedures for customers. This practice is noteworthy because not all customers directly witness the weighing process, raising questions regarding the implementation of Islamic legal principles, particularly the principles of mutual consent (an-tarāḍin), justice (al-'adl), transparency (al-bayān), the prohibition of garar (uncertainty), and the prohibition of ribā (usury). Therefore, this study aims to describe the buying and selling practices implemented at the "Sami Berkah" Waste Bank in Meteseh, Semarang, and to analyze their conformity with the principles of Islamic law. This research employs a normative-empirical legal research method with a qualitative and descriptive-analytical approach using an empirical juridical perspective. Data were collected through observation, in-depth interviews with the management and customers of the "Sami Berkah" Waste Bank, and a literature review of books, scholarly journals, and legal materials related to sales transactions in Islamic law. The collected data were analyzed qualitatively through the stages of data collection, data reduction, data presentation, and conclusion drawing. The analytical framework applied in this study is the theory of sale and purchase based on the principles of Islamic law. The findings indicate that the buying and selling practices at the "Sami Berkah" Waste Bank generally comply with the principles of Islamic law. The principle of mutual consent is reflected in the customers' freedom to deposit waste and choose their preferred payment method, while the principle of justice is implemented through proportional price determination based on the type and weight of the waste. The principle of transparency is demonstrated through clear transaction procedures and the recording of weighing results, prices, and account balances in customers' passbooks as a form of accountability. Furthermore, the transaction mechanism minimizes elements of garar by ensuring clarity regarding the object of sale, measurement, pricing, and transaction documentation, and it does not involve ribā because the legal relationship between the parties is based on a legitimate sale contract involving goods with economic value rather than a loan transaction generating unlawful additional benefits. These findings demonstrate that the buying and selling practices at the "Sami Berkah" Waste Bank conform to the principles of Islamic commercial jurisprudence (fiqh al-muʿāmalah) and may serve as a model for environmentally based economic transactions that are consistent with Islamic law.297.273 Ekonomi Islam / Fiqih Muamalah2026-08-18UIN SUNAN KALIJAGA YOGYAKARTA;FAKULTAS SYARIAH DAN HUKUMThesis