This research aims to analyze the responsibility of developers who do not have good intentions in implementing apartment sale and purchase agreements, with a case study in Decision No. 794/Pdt.G/2022/PN SBY. In this research, the concept of good faith in apartment sale and purchase agreements is discussed and how it is implemented in legal practice in Indonesia. This research uses a normative juridical method with a case approach and relevant laws and regulations.

The research results show that the developer in this case did not carry out good faith at the pre-contractual, contractual and post-contractual stages. This is demonstrated by developers' violations of consumer rights, such as not providing clear and correct information about the products being sold, and not fulfilling promises made in agreements. Legal analysis of the court decision shows that the developer is responsible for the losses experienced by consumers as a result of these actions.