Urban areas are often underrepresented in biodiversity monitoring, despite covering a substantial and increasing proportion of the UK landscape. Within these environments, public-access greenspaces may act as important habitat for birds, yet their role remains poorly quantified at a national scale. Birds in Greenspaces is a new British Trust for Ornithology survey designed to address this gap. Conducted across the UK during the breeding seasons of 2026 and 2027, the project uses a simple, flexible methodology to record bird communities in a wide range of greenspace types, including parks, cemeteries and community spaces. Participants select sites and record species and counts, with survey duration and effort standardised for analysis, while additional ‘quick records’ contribute to species inventories. Habitat data and participant perceptions of greenspaces, the latter collected in collaboration with the University of Kent’s BIO-WELL project, will allow relationships between bird diversity, habitat characteristics and human well-being to be explored. The results will improve understanding of how greenspace type and management influence bird communities, and will inform practical guidance for land managers, local authorities and community groups. By combining ecological and social data at a national scale, the project aims to strengthen the evidence base for urban biodiversity conservation and support more effective management of greenspaces for both birds and people.