An Original Contribution to the Theory and Practice of Affordable Housing Finance Innovation in Sub-Saharan Africa: Evidence from Nigeria

Housing finance system failures are the primary demand-side constraint on affordable housing delivery in sub-Saharan Africa, and developing original theoretical and practical contributions to affordable housing finance innovation for this context represents an urgent scholarly and policy imperative. This study makes an original contribution to the theory and practice of affordable housing finance innovation in sub-Saharan Africa, drawing on Nigeria's experience as the continent's most populous country with the largest housing deficit. A multi-level theoretical framework is developed integrating institutional economics, financial innovation theory, and housing economics to model the conditions under which housing finance innovations succeed in low-income African urban markets. The framework's originality lies in its integration of formal financial system factors, informal financial institution roles (rotating savings associations, ethnic cooperative societies, and microfinance networks), and regulatory-political economy constraints into a unified explanatory model. Empirical research covers three phases. Phase One documents the landscape of existing and pilot housing finance innovations across Nigeria (n = 40 initiatives) through structured interviews with innovation leads, beneficiaries, and regulators. Phase Two conducts a natural experiment analysis using difference-in-differences methodology to evaluate the impact of the Family Homes Fund, Nigeria's largest affordable housing finance programme, on housing access for low-income earners in 6 states between 2018 and 2023. Phase Three tests the theoretical framework's predictions using structural equation modelling with data from 180 housing finance institutional actors. Results confirm the framework's core prediction that innovations combining institutional complementarity (fitting both formal and informal norms) with adaptive design achieve significantly higher market penetration than single-channel innovations. The study generates specific innovation design principles for affordable housing finance in sub-Saharan African institutional contexts.

Keywords: affordable housing finance, financial innovation, sub-Saharan Africa, Nigeria, housing deficit