Investigating the role of density in delivering 20-minute neighbourhoods

Purpose This paper explores how built environment professionals set about employing urban design and planning to deliver 20-minute neighbourhoods by examining how they seek to employ density to achieve this objective. Design/methodology/approach A design-centric approach focuses on what is assumed to be the “causal” role of density and critical massing in generating the desired social and behavioural “effects” underpinning the 20-minute neighbourhood. Wide-ranging analyses are offered of the content of urban design literature on how space can be configured to deliver varying densities at the neighbourhood scale. Extracts from this literature are captured in a series of “position statements”: short descriptions of advice and guidance about how to deploy densities and massing strategies to deliver places where people are willing to live, work and play locally. Findings Policy makers, urban designers, architects and planners and academic researchers commonly suggest the built environment can be (re)configured to improve people's lives, treating population density as a key factor for doing so. But there is no universal agreement about what densities act as tipping points for delivering 20-minute neighbourhoods. A dichotomy emerges between the primarily positive effects of density on resource and economic efficiency and potentially negative environmental and social effects. Uncritical acceptance that higher density and walkable neighbourhoods are both desirable and achievable should be avoided. Advocates need to go beyond sources justifying their presumptions to establish what does and doesn't work, in practice, when delivering 20-minute neighbourhoods. Originality/value This paper surfaces the underlying intentions and motivations of urban designers when making decisions about density. This is revealed as a wicked problem; just one variable in a highly complex network of multi-scalar physical features that make up the urban environment. Achieving physical (let alone social) changes needed - for people to live, work and play locally – are revealed as more difficult to realise than their rhetorical promotion in the literature acknowledges.