Drivers of obesity are systemic and varied, with most outside of people’s control (1). In 2022, a third of Australian adults were living with obesity; and between 2011-12 and 2022, class 3 obesity prevalence increased by 48% (2, 3). Despite being a treatable condition, people experiencing the greatest burden of obesity lack access to low or no-cost specialist medical services in Western Australia (WA) (1). This study aims to describe the East Metropolitan Health Service project to develop an evidence-based patient-centred service model of care for adults with severe and complex obesity (service model). To inform the draft service model, the literature, obesity services guidelines, and existing obesity services were reviewed. The project design incorporated partnership principles, and stakeholders with lived experience of obesity informed service model development. Aboriginal health consumers’ views were integrated via a separate mechanism (not reported here). We identified key health consumer stakeholders and created a project process to enable them to provide direct input to the service model development. Health consumer views were contributed via: 1) including a Health Consumers Council WA (HCCWA) representative on the service model reference group; 2) a HCCWA-led health consumer workshop; 3) a HCCWA presentation and participation in the service model clinician workshop. Consumer feedback strengthened the service model, including by adding a peer-navigator role, improving referral and discharge processes, and prioritising patient-centred, trauma-informed care with a focus on overall patient health and wellbeing. Integrating partnership principles enabled the consumer voice to be incorporated making the service model fit-for-purpose.