The growing demand for adaptable and reconfigurable architecture has necessitated the development of innovative structural components that enable dynamic transformations in buildings. This study focuses on the conceptual and structural design of reconfigurable joints for lightweight spatial structures, using Finite Element Analysis (FEA) to ensure adaptability without compromising structural integrity. Traditional fixed joints, while stable, limit spatial flexibility and functionality. In contrast, reconfigurable joints offer a solution by allowing controlled motion and adjustment of structural elements. This research introduces a novel joint design that incorporates geometric and mechanical principles to achieve three-dimensional adaptability. Finite Element Analysis (FEA) validates the joint's performance under varying load conditions and reconfiguration sequences. The conceptualized joints, when locked, demonstrate sufficient structural efficiency compared to conventional joints, making the proposed system highly suitable for lightweight, modular construction. By enhancing reconfiguration capacity, these joints can contribute to sustainable building practices through material optimization and extended lifecycle usability. This paper presents the detailed design process, analysis, and practical applications, highlighting the potential impact of reconfigurable joints on the future of adaptable spatial structures.