The literature indicates that most housing in the urban areas of many countries in the global South is in informal settlements, provided through informal mechanisms that are often not well understood. This paper contributes to understanding the forces influencing real estate markets in informal settlements, drawing on a case study of the under-researched Ayobo community in Lagos, Nigeria. The paper examines the roles played by government agencies and other market actors, including buyers, sellers, informants, financiers and witnesses, in relation to the operation and regulation of informal land markets. The analysis of the data, drawn from a survey and interviews, reveals a thriving property market, which is socially if not formally regulated. The paper concludes that this flourishing informal market needs strengthening to effectively meet the housing needs of urban residents.