Billings is an outstanding example of the Richardsonian Romanesque style of architecture.
Inside, the building features an imposing entrance hall with a sandstone fireplace. Above the fireplace is a large portrait of Frederick Billings of Woodstock, Vermont, the main benefactor for the building's construction. Many of the original 1885 gas lighting fixtures remain, although the building was electrified in 1911. H. H. Richardson also designed the original furnishings for the library including the tall intricately carved wooden clock that stands in the main hall near the fireplace. The front steps and the surrounding landscaping were designed by the firm of Frederick Law Olmsted, who designed Central Park in New York City.