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Anderson and Baldwin make neighbourhood flourishing an explicit design problem. Their framework translates sustained wellbeing from individual positive psychology into a geographically situated form of community wellbeing composed of neighbourhood feelings and neighbourhood functionings. Belonging, respect, trust, support and safety are treated alongside capacities for participation and collective life, allowing flourishing to become an assessable property of socio-spatial organisation rather than a private emotional outcome. The paper’s crucial move is participatory: residents are not merely beneficiaries of better urban design but potential co-producers and co-maintainers of the neighbourhoods that support them. Extreme and Participatory Citizen Science and Health Impact Assessment are presented as vehicles through which involvement itself can increase empowerment while improving design decisions. The wider bridge to architecture and planning is direct: public space, green space and community buildings become infrastructures for interaction, agency and collective adaptive capacity. Flourishing thus names both an outcome and a mode of producing urban environments.