The Sydney Water head Office building is probably the most significant architectural work by the architects H E Budden and N G Mackey and is listed on the State Heritage Register for its architectural and social values. Elaborate use of granite and marble finished combined with terracotta tiles, bands of bronze and copper, also makes this building an exquisite example of the Art Deco style and detail in Sydney.
Bronze bas relief panels are located above the entrance in Pitt Street which depict the water industry and its progression of technology. The building has an interior light well where the external walls are finished with white glazed ceramic tiles to maximise light reflection. Many of the internal terrazzo and travertine floor and wall surfaces survive, as does a considerable amount of original timber joinery.