[1] PTW is a diverse architectural practice with its designers specializing in a broad range of sectors including residential/mixed use, infrastructure, aged care, the arts (education/culture) and sport.

Peddle was notable in the domestic field, adapting the practice of architecture he learned in England and the United States to the Sydney climate and conditions.

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.

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.

This can be seen in projects such as the Walsh Bay Redevelopment, Angel Place and City Recital Hall, the recently completed extension of the National Gallery of Australia, the Forum Development and East Circular Quay.