This paper traces the development of a modern urban sensibility in the practitioners of architecture in Bombay in the decades before the Nation State. Largely home-grown, they embraced a form of international Modernism. The architecture of the time was prolific but was in contrast to imperialist monumentality. The writings of the 1930s and 1940s that follow these developments are often polemical, pragmatic and even contradictory; but unabashed and outspoken. Both architects and laypersons vigorously debated and argued in public lectures and meetings what Claude Batley would call ‘This New Architecture’. Journals and books would disseminate new ways of living and building that were influential in Bombay and all over India. Cement companies would be at the forefront, disseminating products by publicising notable examples of architecture built every year. It is this ‘new architecture’ that has retrospectively been labelled ‘Art Deco’. This non-monumental, functionalist architecture for contemporary needs defined the urban image of the emerging metropolis. This paper charts these transitions through the voices of the protagonists themselves.