This study aims to analyze the application of the rules regarding hidden defects in the consideration of judges in case No. 193/PDT/G/2019/PN. Jkt.Utr and assess its suitability with the provisions of the Civil Code (KUHPerdata). In addition, this research also explores the reasons why the judge excluded Defendant II and Defendant III from the lawsuit in the case. The type of research used is normative juridical, often referred to as library research. This method is carried out by examining library materials, including books, journals, official articles, legal doctrines, legal theories from various literatures, as well as applicable laws and regulations. The results showed that there were several discrepancies between the application of the hidden defect regulation by the judge and the provisions stipulated in the Civil Code, which had implications for consumer protection and legal certainty. In addition, the judge's reasoning for excluding Defendant II and Defendant III from the lawsuit needs to be further examined to ensure fairness and conformity with applicable legal principles. Based on these findings, this research provides recommendations for the improvement of legal practice in the application of hidden defect regulations, as well as strengthening consumer protection and ensuring legal certainty.