Despite the transformation of English cities by the growth of suburbs in the inter-war years, there is a dearth of reliable information about the processes, and especially the firms, that brought these suburbs into existence. Contrary to accepted wisdom – and paradoxically, in view of the scorn heaped upon suburbs by the architectural literati – architects are shown to have been heavily involved in the preparation of building applications for the construction of suburban houses. In spite of the unprecedented amount of house building in the inter-war period, the geographical spheres of influence of both builders and architects were highly localized. However, unlike in the nineteenth century, there is little evidence of speculative building having been undertaken by people whose livelihood was not primarily derived from house building or house selling.