Abstract IntroductionTransforming built environments (BE) to make them more conducive to physically active lifestyles is a promising strategy to reduce the burden of chronic diseases. We examined population-level agreement with BE transformations and variations as a function of socioeconomic, health, and lifestyle characteristics.MethodsResidents of a large Canadian city (n=1183) were surveyed online by a polling firm during the winter of 2016. Participants rated their level of agreement to seven hypothetical changes to BE in their residential area and provided information about socioeconomic, health, and lifestyle characteristics. We computed age- and sex-weighted proportions of respondents indicating that they would completely agree with different types of BE transformations. We performed unweighted, multivariate logistic regression analyses to identify social inequalities.ResultsResults showed that 29.7%, 15.6, and 5.1% of the population were in complete agreement with (i) providing more sports facilities/bike lanes; (ii) street closures/traffic calming/increasing public transit through gas taxes, and (iii) fines to pedestrians/cyclists for violating the traffic code, respectively. Having no more than a high school education was associated with lower likelihood of complete agreement with street closures/traffic calming/increasing public transit but greater likelihood of complete agreement to fines whereas being an immigrant was associated with greater likelihood of complete agreement with all BE transformations. Women were more likely and individuals older than 55 years were less likely to express complete agreement to providing more sports facilities/bike lanes.ConclusionStrong support for BE transformations varies substantially across socioeconomic characteristics. External funding details Funding CHUM Research Centre research development fund.