Flexible Interior Design in Residential Architecture: Functional Efficiency, Economic Value and Long-Term Housing Performance

Flexible interior design is now widely recognized as a key approach to enhancing the functional efficiency and long-term economic performance of residential buildings It refers to the ability of interior spaces to adapt structurally and functionally to changing user needs over the building lifecycle.Such adaptability can reduce obsolescence, improve spatial usability and support more sustainable living conditions.Contemporary literature shows that strategies such as adaptable layouts, movable partitions and multifunctional furniture enable residential units particularly compact dwellings to accommodate multiple living scenarios without increasing built-up area.These strategies also contribute to lifecycle cost reduction and improved resource efficiency.This study adopts a qualitative descriptive-analytical approach, in the form of a narrative literature review, to synthesize global knowledge on flexible interior design and to examine its implications for functional performance, economic value and long-term housing quality.The analysis indicates that flexibility operates not only as a spatial and design feature but also as an economic and sustainability strategy that extends building lifespan, reduces renovation burdens and enhances user satisfaction.The paper concludes that flexibility should be recognized as a core performance criterion in contemporary and future residential architecture rather than a supplementary design option.It also calls for future empirical research to quantitatively evaluate the economic and environmental impacts of flexible interior strategies in real residential settings.