15-19 Main Street, Randalstown, Antrim, Co Antrim, BT41 3AB

This two-storey, seven-bay rendered building in Randalstown's main street dates from the early to mid-19th century, though its precise construction date remains uncertain. A building is recorded on the site on the 1829 Ordnance Survey map, with a larger structure appearing by 1858. The Post Office relocated to these premises in 1864 and continues to operate there alongside domestic accommodation above.

The entrance elevation faces south onto the main street pavement. The roof is laid with synthetic slates in regular courses and carries three chimneys of yellow brick with moulded brick details to the stringcourse and cornice; the two left-hand chimneys are topped with three tall stoneware pots each, whilst the right-hand chimney has none. The walling is rendered with roughcast wet dash, with smooth rendered rusticated quoins at the extremities. A projecting smooth rendered plinth and projecting eaves course complete the base details. Cast iron gutters and downpipes serve the roof.

The first floor contains seven windows, all modern rectangular timber fixed lights with top-hung vents—these are later replacements for the original timber sliding sashes with full glazing bars. Windows are set in plain reveals with projecting painted stone or concrete cills.

The ground floor comprises three separate openings. At the left-hand extremity is a modern timber shop front with a glazed and panelled door to the right of a nine-pane fixed light window, with a projecting varnished timber cill. Centrally positioned is the house entrance, a modern timber door with a top panel of radial leaded glazing, accompanied by a similarly glazed sidelight and fanlight in rendered reveals. To the right is a second modern timber shop front, mirroring the first but handed differently. At the extreme right is a rectangular vehicular entrance with a large pair of sheeted timber doors in a plain timber frame, leading to the property's rear. The vehicular passage is surfaced in modern brick paving with smooth cement rendered side walls and a flat timber panelled ceiling.

Old photographs document significant alterations to the ground floor. The shop front at the western end was originally a plain window separate from a door. The eastern shop front originally featured panelled pilasters, frieze and cornice, and detailing similar to the central doorway—all now replaced. The building was thoroughly renovated around 1980, when much traditional detailing was lost, and has now lost almost all its original exterior and interior features through this remodelling.

The rear elevation displays a two-storey main block with a projecting single-storey extension to the right. The main walls are rendered with dry dash of white limestone chippings swept over a smooth rendered plinth, with a projecting concrete block and brick eaves course. The main roof uses synthetic slates with four modern rooflights and PVC guttering and downpipes; the single-storey projection has an asphalt roof with timber fascias.

The first-floor windows to the main block are modern rectangular timber fixed lights with side-hung casements and top-hung vents, set in thin projecting concrete cills with plain reveals. Two doorways provide access to the first floor: the left-hand door opens onto an external stairway, whilst the right-hand door accesses the flat roof of the extension.

The rear façade, progressing left to right, comprises: a rectangular opening at the left-hand extremity with a window above; a break forward in the main line containing an external concrete stairway with modern steel railings and a log store beneath, with a doorway above providing first-floor access; three first-floor windows with a combined door and window at the right end; and a projecting single-storey extension with modern windows (one incorporating a plywood panel) and two doors on its right side—one sheeted timber, one flush timber. All windows are modern rectangular timber fixed lights with side-hung casements or top-hung vents.

The building stands directly on the main street pavement, flanked to the west by a public house and to the east by a building of no special interest. A pre-Second World War telephone kiosk stands immediately outside on the pavement.

The rear yard is partly brick paved and partly tarmac with stone chippings. The western boundary comprises a three-storey basalt rubble rear return of the adjacent public house. The northern boundary is formed by a two-storey basalt rubble and brick dressed outbuilding with a slated roof, PVC rainwater goods, an original timber sliding door, and original small-paned fixed lights with bottom-hung top vents. Projecting from this outbuilding is a single-storey, white-painted, flat-roofed rendered block dating from the 20th century. The rear yard's eastern boundary is formed by the return of this white flat-roofed block.