Urban development is an intricate tapestry of interrelated components and interactions that demand a nuanced understanding to foster sustainable growth. Topology, a mathematical concept that defines relationships in terms of connectivity, containment and adjacency, offers a powerful lens through which to examine these interactions. This chapter explores the application of topological principles to urban planning, emphasising the importance of vertical zoning and mixed-use developments in combating urban sprawl. By integrating topological data, we can enhance spatial analysis, ensuring new developments are seamlessly incorporated into existing infrastructures. This approach not only promotes efficient urban design but also supports the creation of sustainable, well-connected cities. Through a data-driven lens, we can achieve a comprehensive representation of urban systems, facilitating more informed planning and fostering the development of smart, sustainable urban environments.