This article elucidates the discursive, spatial and procedural mechanisms by which residential segregation and ghettoisation based on religion in Ahmedabad is reproduced and reinforced. It studies the application of the Disturbed Areas Act of Gujarat, a 1986 law ostensibly intended to curb spatial segregation based on religion by preventing the distress sale of property in ‘disturbed areas’ affected by sectarian violence. However, this law is being used for precisely opposite ends and as a tool of ‘ethnocratic urban planning’ to advance the Hindu right’s goal of separate and hierarchical nations based on religion and to actively ‘Hinduise’ urban space. Current practices of the law enable the state to police boundaries between Muslim areas and adjoining Hindu localities, sealing their porosity and preventing the formation of mixed areas by restricting property transfers. The article uses semi-structured interviews, mapping techniques, participant observation and official data as sources of evidence. It maps ‘disturbed areas’ in Ahmedabad for the first time and presents previously unpublished data on applications for property transfers between persons of different religions under the Act. The article argues that ethnocratic planning combines with a range of other vectors, such as targeted anti-Muslim violence, the hindrance of justice and reconciliation thereafter and the persistent vilification of minorities, to produce saffron geographies of exclusion in Ahmedabad. These saffron geographies of exclusion are grids of Hinduised spaces cleansed of Muslim presence that embody the ascendancy of the ideology of Hindutva over the city and simultaneously create Muslim ghettos.