The architectural and historical specific features of Saint-Jacques’ former post office include, among other things:
- Its massing, including a rectangular plan, a one-and-a-half-storey elevation, a truncated hip roof, a rear annex (rectangular plan, single storey and flat roof) and an open porch overlooking the rear annex;
- Its materials, which consist of a brickwork siding, a shingled roof, concrete foundations and porches, dressed stone sills, granite stairs, wooden openings and the porches’ wrought iron;
- Its openings, such as the main glazed double door, the first floor gemelled hung windows with small panes, the dormer windows, the small-paned hung windows and the four-paned glazed side door;
- Its ornamentation, including the darker bricks, designed to create large arches framing the openings of the first floor, the brick belt courses, also of darker colour, one lying at the wall base, and the other one protruding at the top of the elevations;
- Its globe-shaped porch lamps on each side of the main door and a sign bearing the inscription ‘SAINT-JACQUES, 1927, BUREAU DE POSTE, POST OFFICE’;
- Its location, slightly set back from Saint-Jacques main street, diagonally across from the parish church.