Bannside Presbyterian Church, Castlewellan Road, Banbridge, Co Down, BT32 4AX

Bannside Presbyterian Church is a double-height neo-Italianate Presbyterian church erected between 1864 and 1866 to designs by John Boyd, a Belfast-based architect who specialised in building churches and schoolhouses for Methodists and Presbyterians. Together with his business partner William Batt, Boyd established the firm Boyd & Batt, which operated from 1862 to 1871. The foundation stone was laid by the Marquess of Downshire on 6 October 1864, and the church was designed to measure 77 by 50 feet, with a belfry and a congregation capacity of 650 people. It stands off Castlewellan Road, to the south-east of Banbridge town centre, adjacent to the River Bann.

The church was the second Presbyterian congregation to be formed in Banbridge, established because Scarva Street Presbyterian Church could no longer accommodate its expanding membership following the 1859 Revival. The original church proved similarly unable to contain its growing congregation, which prompted the construction of this new building. The church was originally known as the Church of St. John. The Reverend George Wilson served as the first minister from 1866 to 1880, followed by the Reverend James Scott, who remained in post until 1918. A manse was erected for the congregation in 1871, built by John Jackson under contract with Robert Cochrane; however, Reverend Scott did not reside there during his ministry, living instead at Ballyvally House. Around 1874, improvements were made to the interior, including the re-ceiling of the church and remodelling of the pews. The church was first valued at £40 in 1873, a figure that remained unchanged through to 1930.

The building has a rectangular plan with an adjoining hall to the rear. The roof is pitched natural slate with clay ridge tiles, cast-iron ogee-moulded rainwater goods, a masonry corbelled eaves course, and masonry coping with lead at the front elevation. The external walls are finished in stucco rusticated walling with a projected plinth course and stucco mouldings. Round-arched leaded windows are set into plain recesses with masonry cills. The principal elevation faces east and is symmetrically arranged, featuring a dentilled pediment façade broken by a double-height round-arched recess with a moulded keystone. Within this recess are paired windows with a central moulded colonette, a louvred oculus, and moulded spandrels. The gable is surmounted by a moulded gable bell, though there is no bell present. The central paired doors are flanked by a single window on each side. The round-arched double-leaf timber doors are clad with artisan copper panels dating from the 1960s depicting Christian references, set within moulded surrounds; the sculptor is not known. The left (south) elevation is asymmetrically arranged, five windows wide, with a blank recess and quoins to the right. The right (north) elevation is similarly asymmetrical, five windows wide, with a blank recess and quoins to the left. The rear (west) elevation is symmetrical and is largely abutted by a pitched-roofed link block connecting the church to the adjoining hall; the exposed section has a central oculus at high level flanked by a recess encompassing an oculus at a slightly lower level.

Internally, the overall proportions and plasterwork detailing remain intact, including what Charles Brett described in 1969 as a "rather fine compartmented ceiling with feathery plaster rosettes in a sort of Japanese-Rococo style." Brett also described the exterior as "distinctly strange," noting the "too-tall pediment surmounted by curious tiny bell-less belfry" and "the base of the pediment broken to admit broad recessed arch." Some of the original fixtures and fittings have been lost.

The main church is adjoined by several additions erected across different periods. A roughcast render, gable-ended hall dating from around 1900 is further abutted to the north and west by a single-storey flat-roofed extension of around 1960. A two-storey block was added in 1996 to designs by Maurice Cushnie Architects, adjoined by a glazed lobby. To the south of the church car park stands a basalt masonry mill building, and the River Bann lies to the west. The site is bounded to the west by a modern railing. The setting has been compromised by the modern church hall and extensive tarmacadam surfacing.