The increasing urbanization and influx of people into cities urge the need for sustainable living solutions, pressing on natural resources and environmental sustainability. This study explores how integrating principles of sufficiency and adaptability to varying occupant needs can enhance the adequacy and optimization of space and resource consumption. Building upon an integrative review of existing literature, it investigates these concepts' interconnectedness within the built environment, aiming to clarify adaptability's potential in facilitating space-sufficiency interventions.

A synergetic linkage of the principles of adaptability and sufficiency in buildings is needed to adapt to evolving needs and reduce environmental impacts. Such an approach stresses a user-focused strategy and views buildings as dynamic systems capable of adapting to technological changes, environment, and society. This manuscript leverages an integrative literature review to propose a conceptual framework to enhance building space utilization.

Drawing inspiration from the 5R Hierarchy, traditionally applied to waste management, it reimagines underutilized space as a form of waste, suggesting intervention steps such as rethinking, reducing, reusing, and repurposing. These steps target spatial rearrangements to tackle the complexities of space optimization.

Aligned with the "Intervention Steps," a series of Key "Intervention Parameters" are outlined to boost the effectiveness of interventions across Shearing Layers, considering the immediate and future needs of occupants. This framework provides a strategic approach to managing space and promoting environmental sustainability and occupant well-being effectively, with the potential to yield economic and social advantages in built environments. The proposed “Intervention” Framework is based on an extensive literature review, but real-world applications are needed to refine and validate this approach. Further exploration is necessary to identify regulatory and policy frameworks to facilitate and incentivize its implementation.