This insightful book examines the role of an urban contingencies approach in understanding contemporary urban sustainability planning, emphasising the importance of context and place sensitivity and offering a crucial alternative to existing best practice planning ideas.Leading experts explore how a situated urban contingency approach engages with different planning interventions, ranging from disciplinary identities and everyday practices to digitalisation for citizen engagement, systems of bureaucratic knowledge production and infrastructural doctrines. Chapters delve into case studies such as the development of affordable housing, professional boundary work in integrating climate change adaptation, and the role of urban experimentation in planning for urban sustainability. The book further demonstrates how context-sensitivity fosters creative knowledge production and more inclusive planning, advocating for the integration of best practices with an urban contingency logic.Students and scholars of planning and related disciplines such as geography, urban studies, sociology and sustainability studies will find this a vital resource. Practitioners working in planning and climate change mitigation will greatly benefit from this informative book.