Evaluation of a complex healthcare intervention should include careful exploration of the mechanisms through which it brings about change. This paper describes a qualitative evaluation of the Redesigning Daily Occupations (ReDO^®-10) programme as it was implemented for the first time with women with stress-related issues in a primary care setting in Ireland. The ReDO^®-10 is a 10-week group intervention designed to support participants make changes to their daily activity patterns to have a more satisfying and balanced daily life. Fourteen women were interviewed after completing the programme. The aim was to explore changes that participants perceived they experienced and to understand how the content of ReDO®-10 was thought to bring about this change (if it did). Directed content analysis was used to analyse the qualitative data using the Behaviour Change Wheel and Theoretical Domains Framework as a coding framework. Overall, four BCW functions of ReDO^® -10 were identified: Education, Persuasion, Modelling and Enablement. Participants described improved belief in their own capabilities, knowledge and goals around life changes. Many behaviour changes were also described, particularly in relation to doing more restorative activities in daily life. Behaviour change techniques that were identified as important for change were practicing new, restorative occupations in group sessions and as homework and the use of self-analysis activities to understand the relationship between activities and health for these participants. Modelling, support and other effects of group dynamics were also vital in changes that occurred. © 2022 The Authors