Based on the findings of multiple studies undertaken over the past 15 years or more, it is now clear that heritage-based wellbeing projects have the potential to offer a range of social and therapeutic benefits. Furthermore, the current evidence base suggests that heritage assets, in their narrative, aesthetic and temporal capacities, can influence wellbeing in unique ways within certain contexts. Such impacts manifest, for example, through a greater sense of identity, place, time and connectedness. Reviewing recent studies concerned with the heritage-specific nature of these experiences, this exploratory paper suggests that the direct impact of cultural heritage on wellbeing might be tracked by evidencing these effects in their capacity as processes to wellbeing. Based on the existential quality of these processes, in terms of the meaning-making and perspective-taking dynamics inherent within them, it questions whether routinely used evaluation tools alone can sufficiently assess this impact. Accordingly, with an eye to developing sector-specific indicators capable of isolating these effects, the paper briefly explores relevant wellbeing frameworks and asks if, in respect of their existential components, validated spiritual wellbeing scales might provide a way forward.