Disappearing Facades: Architectural Heritage Loss and Urban Transformation on Lagos Island, Nigeria: An Archival-GIS Analysis (2000-2025)

Abstract

The architectural heritage of Lagos Island-a historically rich urban landscape that includes pre-colonial Yoruba ettlements, colonial administrative buildings, and a significant concentration of Afro-Brazilian returnee structures—is currently facing rapid and largely unrecorded deterioration due to commercial redevelopment and pressures from the speculative land market. This research utilizes an integrated archival-GIS comparative methodology to systematically document, quantify, and analyze the loss of architectural heritage across four historically important areas of Lagos Island-Marina/Broad Street, Campos Square/Olowogbowo, Isale Eko, and Ebute Ero-over a span of 25 years (2000-2025). By combining archival photographs, historical maps, planning documents, and field observation checklists with multitemporal GIS land use analysis, the study establishes a comprehensive baseline of heritage feature prevalence in 2000 and quantifies the documented loss by 2025 across a systematically sampled dataset of 780 building units. The findings indicate that 56.4% of buildings showcasing traditional architectural features in 2000 had lost those features by 2025, with Zone A (Marina/Broad Street) experiencing the most significant loss at 87.5%. Feature-level analysis highlights ornamental ironwork (-80.0%), arcaded verandas (-78.2%), and decorative stucco facades (-73.5%) as the most endangered architectural elements. An archival comparison between historical photographs and current field documentation verifies the systematic disappearance of Afro-Brazilian architectural styles in Campos and Olowogbowo, areas of international heritage importance. The study illustrates that the loss of architectural heritage in Lagos Island follows a spatially structured gradient associated with commercial development pressures, and that the current governance frameworks are insufficient to manage or monitor this process. It concludes with a tiered policy framework-including emergency designation for critically degraded areas, heritage conservation area controls for high-risk zones, and GIS-based monitoring systems for moderate-risk areasoriented toward integrating architectural heritage into Lagos's land administration and urban planning systems.