 Richmond Post Office is substantially intact and retains the features which make it culturally significant, including architectural details such as the arcaded loggia, distinctive use of freestone, bi-chrome brickwork and cast iron lace, along with its overall scale, form and style.Richmond Post Office is significant at a State level for its historical associations, strong aesthetic qualities and social value.Richmond Post Office is historically significant because it is associated with the NSW Colonial Architect's Office under James Barnet, and is part of an important group of works by Barnet, a key practitioner of the Victorian Italianate architectural style in NSW.