The Hills-DeCaro House is most significant for its architecture which represents the transition and integration of Wright's early experimental style and his mature Prairie style. Among features which reference his earlier designs are the windows; instead of the elaborate, geometric art-glass patterns which Wright first introduced in the Frank W. Thomas House, Wright employs simpler leaded frames with clear glass. The design is most similar to that of the Robert G. Emmond House or the wood muntin configuration of the Thomas H. Gale House, two of Wright's first works. Additionally, the house has a finished basement and attic, both of which Wright would avoid whenever possible following the development of his Prairie house.