Abstract
This study examines the complex and often misunderstood role of urban planners in shaping the growth of Lagos, with a particular focus on the persistence of informal settlements and the challenge of achieving orderly urban development. Rather than treating informality as a failure of planning, the research approaches it as an outcome of deeper structural conditions, including rapid population growth, limited institutional capacity, housing shortages, and the mismatch between formal planning frameworks and everyday urban realities. Using a qualitative, spatially oriented methodology, the study analyses the physical form of selected areas across Lagos, highlighting contrasts between planned neighbourhoods and informal settlements in terms of density, layout, land use, and environmental adaptation. The findings reveal that informal settlements are not random or chaotic, but instead exhibit consistent spatial patterns shaped by economic necessity, incremental development, and social organisation. At the same time, formally planned areas, while more orderly in appearance, often exclude a large portion of the population due to rigid regulations and high development costs. The research further demonstrates that urban planners influence city outcomes not only through active interventions such as zoning and development control, but also through inaction, selective enforcement, and institutional limitations. This dual role contributes to a fragmented urban form where formal and informal systems coexist and interact. Efforts aimed solely at preventing informality, particularly through demolition and eviction are shown to be largely ineffective, often reproducing the same challenges in new locations. Ultimately, the study argues for a shift in planning practice from strict control to adaptive engagement. It suggests that planners should move toward more inclusive, flexible approaches that recognise informality as a permanent and functional component of the city. By integrating insights from informal urbanism into planning and design, Lagos can move toward a more realistic form of urban order, one that balances structure with accessibility, and regulation with the lived realities of its residents.