Multifunctional Interior Design as a Strategy for Sustainable Built Environments: Bridging Professional Practice and Design Education

Contemporary built environments are increasingly constrained by limited spatial resources, rising density, and evolving functional requirements, demanding more adaptive and sustainable design strategies. Although multifunctional interior design is widely recognized for improving spatial efficiency, material reduction, and long-term adaptability, there remains a need for practice-based studies that examine how multifunctionality can be analyzed consistently across professional practice and design education in relation to sustainability. This practice-based qualitative study investigates how multifunctionality contributes to sustainability across the author’s professional practice and design education through a comparative analysis of professional projects and educational design experiments. The research adopts a qualitative, practice-based methodology combining the analysis of six professional projects from the author’s architectural practice with ninety educational design projects developed within an integrative architectural curriculum. These include multifunctional interior interventions, adaptive furniture systems, and digitally fabricated prototypes exploring small-scale renewable energy integration through solar-powered lighting and bio-inspired micro-structures developed within studio-based learning and digital fabrication courses. The comparative analysis identified recurring multifunctional design mechanisms operating across multiple scales, from furniture objects and interior systems to architectural interventions and concept-driven spatial identities. Beyond functional optimization, it acts as a generative design framework capable of integrating spatial organization, material efficiency, social interaction, and environmental responsiveness. The educational projects further suggest that multifunctionality can be effectively introduced as a pedagogical tool, supporting the development of spatial thinking and design adaptability. The main scientific contribution of this study is the development of a practice-based analytical framework that connects professional practice, project-based learning, and digital fabrication through multifunctionality as a common design strategy. This framework is characterized by a highly integrated cross-disciplinary structure, in which multiple subjects converge within the core Design Studio, enabling a continuous exchange between theory, practice, and experimentation. This approach strengthens the connection between academic learning and professional application. The results suggest that multifunctional interior design contributes to sustainability by reducing spatial redundancy, integrating multiple functions within single systems, supporting long-term adaptability, and encouraging more efficient use of material and spatial resources. These findings support the interpretation of multifunctionality as a transferable sustainability-oriented design strategy that connects professional practice, architectural education and emerging design technologies through recurring mechanisms of spatial optimization, resource efficiency, and long-term adaptability.