Abstract Prevention is a core principle in social care legislation across the UK. However, history shows great variability in how a preventative social care agenda is conceptualised and implemented. We report findings from an independent evaluation of the implementation of the ‘2014 Social Services and Well-being (Wales) Act’ incorporating a document analysis of reports and plans from Wales’ twenty-two local authorities (LAs) and eighty-eight qualitative interviews from social services strategic leaders and operational managers within four Welsh LAs. Analysis highlighted multiple interpretations of national policy, with notable overlapping agendas. In Gramscian terms, there is a constant process of negotiating prevention values and agendas, with consequences for whose interests are served. This was apparent through drives towards cost-saving, financial sustainability and reduced service demand operating alongside values-based principles rooted in well-being and mutualism. Following Kenny’s work in community development, we argue a ‘fusing’ of principles whilst espousing benefits for service users, potentially blurs the aims of the legislation, with implications for practice.