“THE TRUE DIMENSION OF CITIES IS NOT SPACE, BUT TIME” (Konstantinos Doxiadis) This shift from the spatial dimension to that of time, places the focus on the individual’s scale of perception. How individuals spend their time shapes and infuses our environments with meaning, influencing social dynamics and cultural values. The Next Generation EU project exemplifies this shift by integrating lifestyle and environmental sustainability into urban planning. The goal is to facilitate a just transition to a circular economy, redefining not only the physical layout of cities but also the lived experience of its citizens within these evolving spaces. The evolution from the “Citizens’ Sustainable eXperience” to the “Communities’ Sustainable eXperience” , in the interdisciplinary research funded by the European Union, underscores a significant progression from individual to collective experience. UX, rooted in human-centered design, focuses on optimizing products and environments for personal use and satisfaction, CX expands these principles into the realm of more-than-human-centered design, where the focus extends beyond individual users to include wider community interactions and ecosystems. Therefore, the shift from UX to CX in urban planning and design is profoundly ethical. It calls for a paradigm that prioritizes collective well-being and sustainable development, inclusivity and cooperation.