New forms of self-organised housing are emerging in numerous locations around the globe, particularly in locations where regulated housing markets and state-provision for vulnerable households are affected by budget cuts and urban speculation, leaving the middle class at the urban periphery. Residents who join forces to act collectively to implement housing for their own use are known by terms as diverse as ‘building groups’ (Germany), ‘collective custom build’ (United Kingdom), ‘deliberative development’ (Australia) and ‘co-housing.’ ‘Collaborative housing’ has become an umbrella term for this housing sector. @en