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IntroductionChildhood obesity and physical inactivity are two of the most significant modifiable risk factors for the prevention of non-communicable diseases (NCDs). Yet, a third of children in Wales and Australia are overweight or obese, and only 20% of UK and Australian children are sufficiently active. The purpose of the Built Environments And Child Health in WalEs and AuStralia (BEACHES) study is to identify and understand how complex and interacting factors in the built environment influence modifiable risk factors for NCDs across childhood.Methods and analysisThis is an observational study using data from five established cohorts from Wales and Australia: (1) Wales Electronic Cohort for Children; (2) Millennium Cohort Study; (3) PLAY Spaces and Environments for Children’s Physical Activity study; (4) The ORIGINS Project; and (5) Growing Up in Australia: the Longitudinal Study of Australian Children. The study will incorporate a comprehensive suite of longitudinal quantitative data (surveys, anthropometry, accelerometry, and Geographic Information Systems data) to understand how the built environment influences children’s modifiable risk factors for NCDs (body mass index, physical activity, sedentary behaviour and diet).Ethics and disseminationThis study has received the following approvals: University of Western Australia Human Research Ethics Committee (2020/ET000353), Ramsay Human Research Ethics Committee (under review) and Swansea University Information Governance Review Panel (Project ID: 1001). Findings will be reported to the following: (1) funding bodies, research institutes and hospitals supporting the BEACHES project; (2) parents and children; (3) school management teams; (4) existing and new industry partner networks; (5) federal, state and local governments to inform policy; as well as (6) presented at local, national and international conferences; and (7) disseminated by peer-reviewed publications.

The influence of the neighbourhood built environment on young children’s physical development has been well-documented; however, there is limited empirical evidence of an association with social and emotional development. Parental perceptions of the neighbourhood built environment may act as facilitators or barriers to young children’s play and interactions in their local environment. The aim of this study was to examine the associations between parents’ perceptions of the neighbourhood built environment and the social-emotional development of children aged two-to-five years. Parents’ positive perceptions of traffic safety (OR 0.74; 95% CI 0.55, 0.98), crime safety (OR 0.79; 95% CI 0.64, 0.99) and land use mix–access (OR 0.74; 95% CI 0.56, 0.98) were associated with lower odds of social-emotional difficulties, while positive perceptions of walking and cycling facilities were associated with higher odds of difficulties (OR 1.26; 95% CI 1.02, 1.55). Positive perceptions of land use mix–access (OR 1.32; 95% CI 1.03, 1.69), street connectivity (OR 1.35; 95% CI 1.10, 1.66) and neighbourhood aesthetics (OR 1.27; 95% CI 1.01, 1.60) were associated with higher odds of prosocial behaviours. Interventions to improve parents’ perceptions of built environment features may facilitate opportunities for play and interactions which contribute to healthy social-emotional development.