Co-design, design process, human behaviour, poverty, base of the pyramid (BOP)Co-design with marginalised people is crucial for sustained adoption and use of frugal innovations or Product Service Systems (PSS). Interviews were conducted with eighteen designers to identify barriers and enablers that they encounter in co-designing with marginalised people. The findings suggest that the factors supporting or hindering this co-design relate to the context of marginalised societies, co-design processes and methods, organisational issues, and aspects of collaboration. Consideration of these factors can lead to more impactful co-design with marginalised people.