 Henceforth the firm was known as Peddle Thorp & Walker and the office began to diversify from a purely domestic practice to one that also excelled at commercial and industrial architecture.During the years of the Second World War, PTW continued to practice with numerous defence projects awarded to it by the Commonwealth Department of Works.In the mid-1950s the massive growth of Australia's built environment saw PTW grow under the leadership of the late Graham Thorp to dominate the commercial building market, for which it is still renowned.