Entry to the central retail shop is via the original side porches and steps. Directly beyond this, running in an east–west direction is a double loaded corridor, with access to administrative and staff areas on the west including an interview room, office, store rooms, lunchroom, plant and male toilets. To the south, a centrally-positioned passage leads down a few steps to the female toilets, contractors' room and lockers. This section of the building, constructed in reverse hardwood frame has vertical board linings and ceilings and panelled doors, and may correspond to the original 1875 post office. The entire east wing and verandah appears to be an addition built after 1957 and comprises the open mail sorting room and post office box wall; further south, the construction of the service area and loading dock has internalised the former weatherboard exterior.
