AbstractDrawing on data from two empirical projects concerned with local authority enforcement of standards in the private rented sector, this article argues that there are signs of greater use of formal enforcement approaches, and that these approaches are increasingly ‘hardline’. This finding runs counter to the existing scholarship on regulatory enforcement, which emphasizes securing compliance over formal enforcement. Securing compliance is also integral to the regulatory guidance in this sphere of activity. Further, in the context of cuts to local authority funding and greater local authority demand for private rented stock to meet household needs, the shift to hardline approaches requires explanation. Drawing on Keith Hawkins’ and Peter Manning's theory of legal decision making, which emphasizes consideration of the surround, the field, and the frame, the authors explain how changes to the field, in particular, have encouraged this shift.