Coulter House, 40 Comber Road, Ballyministragh, Killinchy, Co Down, BT23 6PB

Coulter House is a substantial two-storey house built in 1789, situated on the west side of Comber Road, less than a mile north-west of Killinchy village in County Down. The building's overall form appears consistent with late 18th-century construction, though later alterations have degraded its architectural interest.

The house is a large two-storey building with a hipped roof, set within a kind of terrace arrangement with lower gabled outbuildings attached to the north and south. The front east-facing façade is symmetrical, dominated by a central doorway with a modern glazed door, late Victorian moulded surround and keystone. Above the door is an inscribed panel reading "Built by John Coulter A.D. 1789", with modern wrought iron letters spelling out "Coulter House" attached below. The ground floor has two sash windows with vertical glazing bars to each pane flanking the entrance at far left and far right. The first floor contains five small sash windows, each with a single horizontal glazing bar to the lower pane only.

A two-storey barn is attached to the south façade, slightly shorter than the house, with its upper level possibly connected internally. A single-storey barn is attached to the north façade. The rear elevation features a left-of-centre lean-to glazed porch covering a modern glazed door, with a small window of modern metal frame to its left. To the right of the porch are two larger windows with similar metal frames, both slightly enlarged at some point. The first floor has four small, roughly evenly spaced windows of varying size, all with modern metal frames.

The front façade and exposed sections of the north and south facades are finished in lined render with chamfered quoins and plinth. The rear is finished in rough cast and left unpainted, as are the barns. The roof is hipped with Bangor blue slates and two central yellow brick chimney stacks. The barns have gabled roofs. Cast iron rainwater goods are present.

The inscription panel itself displays typeface more characteristic of the early 19th century, though the overall form of the house is reasonably consistent with a late 18th-century date. The building is shown on the Ordnance Survey map of 1834 marked as "Post Office", a role it continued to serve as of the revised map of 1859–60. The decoration of the doorway, chimneys and front window frames suggest renovation occurred circa 1890–1910, with further changes later in the 20th century. The house served as the Church of Ireland rectory for Killinchy parish between 1947 and 1949. The Coulter who built this house was probably related to the Coulter owners of the former Balloo corn mill, situated a short distance to the south.