Abstract Background The prevalence of obesity worldwide has been steadily increasing. This has generated an uptake in research determining the cause of obesity. One of the primary drivers that have been identified is the “obesogenic environment', which is an environment that contains features that increase excess weight in individuals or populations. Obesogenic environments are unevenly distributed with socio-economically disadvantaged neighbourhoods being more affected. Methods This survey is part of the CIVISANO (‘Community-based participatory research to tackle the disparities in health-enhancing lifestyle within the municipality environment') project, which will be conducted in two municipalities. Respondents will be socio-economically disadvantaged adults between 25- and 65-years old. To gain information on individual characteristics and perceptions of the obesogenic environment, residents will be invited to complete a survey. Since it is known that socio-economically disadvantaged respondents are difficult to reach a non-random active recruitment approach will be applied. The following variables are included in the survey: sociodemographic information, subjective health and anthropometrics, dietary habits, food security and physical activity. Items from the SPOTLIGHT project survey and NEMS-P survey were added to assess respondent's perceptions of features of the obesogenic environment. Additional variables on individual characteristics were based on items from the Belgian National Health Interview Survey of 2019. Results Through the survey, we expect to gain insight into the perceptions of socio-economically disadvantaged adults on obesogenic features of their local environment. Initial results from the survey will be available in the upcoming months. Conclusions The construction of instruments to assess the context-specific features, which can be compared with objective measurements, can increase our knowledge of contextual determinants of the obesogenic environment. Key messages The first Flemish survey ...