Objectives UK carer assessments, in primary and social care, intend to discover what carers need in their caring roles and more widely. Evidence points to these not being configured sufficiently around carers of people with dementia, with potentially their breadth of needs not being recognised. We evaluated the extent of agreement, between carers of people with dementia, primary care, and social care professionals, on their recommendations from assessing carers’ needs in a range of circumstances. It is intended for findings to be taken forward as recommendations for policy and practice. Methods Comparison of judgements, between carers, primary and social care professionals, on whether real-life circumstances in 9 anonymised case vignettes necessitated a range of 14 services to support carers appropriately. Participants were 6 carers of people with dementia, 7 primary care staff, and 2 social care staff. We presented participants with each vignette and asked them to make binary judgements of whether they would recommend a range of services in each case. Percentage agreement and Fleiss’ kappa coefficients measured the level of agreement amongst multiple carers, primary and social care staff and overall. These agreements were then compared. Results Carers agreed in their judgements more than primary or social care professionals. The overall level of agreement from judgements made by all participants, however, was ‘slight’ with variability between participant groups and overall. The need for First Language Support in some cases was recognised, an improvement from previous evidence. Conclusions Case vignettes are useful for investigating judgements concerning these carers’ needs, so raising issues for policy and practice. It is essential for carer assessments to be more reliable in recommending services based on need to ensure less variability, depending on assessor and carers circumstances.