Rather than make bespoke bodies to individual designs, Carbodies set out to produce coachwork to a number of standardised designs for car companies that did not have their own coachbuilding facilities. Their first major customers during the 1920s were MG and Alvis Cars. The scale of a new contract to build bodies for the MG M-Type Midget meant that they needed larger premises and in 1928, they moved to a larger site on Holyhead Road, where they remain to this day. In the 1930s, they supplied bodies for Rover, Invicta and Railton, but by far their biggest and most important customer in that decade was the Rootes Group.