Trinity Presbyterian Church, Church Road, Boardmills, Lisburn, County Down

Trinity Presbyterian Church is a double-height barn-style Presbyterian Church dated 1802, located on the north side of Church Road, Boardmills. The building is rectangular on plan with an attached two-storey extension on the east side, added in 1986.

The church is constructed with ruled-and-lined smooth render walling, projecting stepped quoins and plinth. The pitched roof is covered in natural slate with clay ridge tiles, masonry raised verges, and a chimney at the east gable. Cast-iron gutters are fixed to the projecting eaves course and painted. Windows are timber-framed stained glass leaded lights set within round-arched-headed openings, finished with smooth rendered bands, round-arched-headed hoodmoulds with label stops, and projecting painted masonry sills. The majority of these windows have since been replaced with timber-framed obscured glazing.

The principal entrance faces west on the gable, comprising a Classical entrance portico with moulded pilasters and console brackets supporting a plain triangular pediment. Above this are two segmental-arched windows with segmental hoodmoulds and label stops. The north elevation contains six windows, the third from the left retaining leaded stained glass. The south elevation is also six windows wide, with two central windows containing leaded stained glass. A date stone at the centre of the church reads: "This House was Built/1802 the Revd/JOSEPH LONGMOOR/Minister".

The 1986 extension at the east gable stands at similar height and features a natural slate roof with cast-iron ogee profile rainwater goods on a projecting eaves course. The walling matches the main church with ruled-and-lined smooth render, stepped quoins and plinth. Windows are similar in style but diminished in height. The east gable of the extension contains a central entrance porch with pitched natural slate roof and a date stone reading "1986", with three windows at first floor level. The south cheek is set back from the church's south elevation with three windows at each floor, while the north cheek is set back from the north elevation with two windows at each floor. Concrete steps and a metal handrail lead down to a basement boiler room.

The church stands on a large cemetery site accessed from the south via splayed boundary walls and replacement metal gates. The graveyard contains a range of grave markers dating from the early nineteenth century. A church hall dated 1926 stands to the west of the church.

The site has considerable historical significance within the local Presbyterian community. The first congregation in the area was established around 1749 as part of a Seceder movement originating in Scotland. The present church building was constructed in 1802. Two breakaway churches were subsequently built along Church Road in 1812 and 1846, known as Second Boardmills and Killaney respectively. The congregation of the present church was known as Killaney until 1815, after which it became First Boardmills. The church joined the General Assembly in 1840. Tensions between the three congregations eventually eased, with Second Boardmills and Killaney joining the General Assembly in 1851 and 1925 respectively. Killaney and Second Boardmills united in 1925, and the following year, First Boardmills received the gift of a spacious hall from Mr John McKee, a former member now living in New York. In 1937, a minister's room and choir room were added to the church. During the long ministry of Mr Kerr from 1933 to 1973, numerous alterations were made including a new pulpit, stained glass windows, reading desk, choir seats and baptismal font. The McKee hall was destroyed by fire and rebuilt in 1951. In 1974, First and Second Boardmills and Killaney consolidated under the ministry of Reverend George Simpson. In 2002, they were amalgamated into a single congregation known as Trinity Presbyterian Church, Boardmills. The congregation now worships in the present church, with the other two buildings no longer in regular use.

The church remains an important local place of worship within the Presbyterian community in Boardmills, though the extensive twentieth-century alterations mean it does not meet the criteria for listing.