Cultural centres increasingly function as multifunctional civic infrastructures accommodating diverse and evolving cultural activities. However, many contemporary facilities continue to rely on rigid spatial configurations that limit adaptability and long-term performance. This study examines how flexible spatial planning can enhance the functional performance, adaptability, and sustainability of cultural centres, using a proposed cultural centre in Lokoja, Kogi State as a contextual case study. Drawing on architectural theory, precedent analysis, and design-based research, the study evaluates flexibility through parameters including spatial adaptability, multipurpose use, circulation efficiency, indoor–outdoor integration, and environmental responsiveness. The findings indicate that embedded flexibility achieved through structured zoning, reconfigurable interior systems, and layered circulation significantly improves space utilisation, operational efficiency, and inclusivity while supporting long-term sustainability. The Lokoja proposal demonstrates how flexible spatial strategies can be contextually adapted to climatic and socio-cultural conditions without compromising architectural identity. The study contributes to architectural technology discourse by positioning flexibility as a performance-driven design strategy essential to contemporary cultural infrastructure in dynamic urban contexts.