What shapes public investment in private housing? The political economy of retrofit in the UK

The UK has among Europe's least efficient housing, yet the number of retrofit measures installed under government-backed programmes fell from almost 2.4 million in 2012 to under 150,000 in 2024. This article asks what political-economic conditions have legitimised state intervention in private housing, and how these have shaped its implementation. Drawing on an integrative review of archival sources, policy documents, academic literature, and 21 interviews, it traces UK policy on both energy upgrades (retrofit) and repairs and improvements (renewal) from the 1860s to the present. A four-part framework distinguishes policy configurations by their targeting of support (universal or residual), orientation (public or market-based), scope of works, and spatial scale of delivery. The analysis shows that universal support has been offered when investment in housing served wider strategic agendas such as homeownership expansion and energy security, and that residualisation and market delivery have progressively narrowed both what programmes address and where they operate. Individualised responsibility for maintaining private housing is a recent principle, dating from the late 1980s. Meeting current decarbonisation commitments will require reconstructing the more expansive approaches it displaced.