The Coles Memorial complex represents a restrained form of colonial architecture adapted to regional conditions and materials. The buildings employ a straightforward institutional composition, with carefully proportioned openings, spacious internal areas and architectural elements suited to the local climate. Rather than relying on excessive ornamentation, the design emphasises functional planning, structural clarity and the relationship between the individual buildings within the complex.

A notable feature is the use of regional construction materials, demonstrating how colonial architectural ideas were adapted to local building traditions and resources. Masonry forms the principal structural system, while traditional craftsmanship is evident in the treatment of openings, walls and other architectural details. The restrained decorative vocabulary gives the complex a dignified institutional character while retaining the visual qualities associated with early twentieth-century colonial buildings.

The surviving structures are especially significant because their architectural expression reflects the interaction between imported colonial planning principles and locally available materials and building practices. Their relatively simple forms, durable construction and climate-responsive spatial organisation illustrate the practical character of institutional architecture in early twentieth-century Kurnool.