This paper examines the role that two Public Value Capture (PVC) mechanisms could play in providing a source of funding for urban infrastructure in the case of two coastal areas in France and Greece. High development pressures in those areas have been exacerbated in recent times by the growing ‘informality of desire’. Therefore, in a context of climate change the two case study areas face the dual challenge of an increasing ‘investment gap’ and increasing vulnerability. Although the estimated costs are still based on approximate calculations, they are substantive. Using primary and secondary data, as well as analysis of the legal and policy framework, the paper shows that ‘informality of desire’ is not only tolerated but actually incentivised in both countries. This leads to substantial short-term financial benefits for private developers and property owners but also some gains for local authorities and central governments. However, the value captured via the legalisation fees and property taxation is not adequately ringfenced and in any case it is not enough to cover the infrastructure gap and the potential compensation in case of natural disasters