There are numerous ways in which people make illegal or unauthorized alterations to urban space. This study identifies and analyzes one that has been largely ignored in social science: explicitly functional and civic-minded informal contributions that I call “do-it-yourself urban design.” The research, which began as an investigation into more “traditional” nonpermissable alterations, uncovered these cases—from homemade bike lanes and street signs to guerrilla gardens and development proposals—that are gaining visibility in many cities, yet are poorly accounted for by existing perspectives in the literature. This article examines the existing theories and evidence from interviews and other fieldwork in 14 cities in order to develop the new analytical category of DIY urban design. I present findings on the creators of these interventions, on their motivations to “improve” the built environment where they perceive government and other development actors to be failing, and on the concentration of their efforts in gentrifying areas. This introduces the possibility of conflict and complicates their impact. I argue that DIY urban design has wide-ranging implications for both local communities and broader urban policy.
Defensible space (DS) theory proposes that the built environment can promote neighborhood safety and community by encouraging residents’ appropriation of near-home space. This article examined the relationship between three differ- ent forms of resident appropriation and residents’ experiences of neighborhood safety and community. Results from a survey of 91 public housing residents living in moderately defensible spaces suggested that residents who defended near-home space through territorial appropriation experienced the neighborhood as a safer, more cohesive community than did residents who did not appropriate space in this way. Residents who spent more time outside experienced the neighborhood as a safer place; however, casual social interaction in near-home space was not consistently related to outcomes. While no causal information is available from the correlational data presented here, this work takes an important step of providing empirical evidence of a systematic link between certain aspects of resident appropriation and positive outcomes. Implications for DS theory and for public housing policy are discussed.
