Bonnybridge, High Street, St Helen's Parish Church, Bonnybridge

The building comprises a church and hall constructed between 1877 and 1878 by Alexander Watt, with an extension to the hall in 1881. It is a rectangular, Gothic-style church with buttresses separating the bays. A bellcote sits atop the gable of the main, south-facing elevation, and a double-gabled hall adjoins the east side.

The exterior is predominantly built from squared snecked tooled rubble, with a finer coursed finish to the central bay of the south-facing elevation. Ashlar buttresses, a droved ashlar base course, and droved margins to the quoins are also present. An eaves course runs along the top of the building. The church windows are mostly lancet windows, while the hall windows are shouldered.

The south elevation features a three-bay church to the left. A more prominent central bay has angle buttresses and pinnacles above and includes a bellcote with a bell. Steps with cast-iron lamp standards flank a two-leaf timber-boarded door set within a columned pointed-arched doorpiece, which is itself framed by small, cusp-headed windows, all beneath a continuous hood moulding rising to a finialled apex. Above the doorpiece is a four-light Geometric window, also with a hoodmould. Connecting the church and hall is a single bay; the hall itself has a double-gabled design, with two windows to its left gable, a door and window to its half-basement, and steps leading to a two-leaf timber-boarded door with boarded openings and a hoodmould to the right gable.

The east side elevation is eight bays broad, with a slightly advanced gable to the sixth bay from the left, and bipartite windows to the fourth, fifth, seventh, and eighth bays. A hoodmoulded tripartite window is present in the advanced bay. The west side is a simpler six-bay elevation.

The north elevation shows the double-gabled end of the hall; two blocked windows are present on each gable, accompanied by lean-to ground floor extensions on the left-hand gable and a brick stack between the gables. Adjoining the hall to the right is the gable end of the church, divided by buttresses, with a rose window at the centre and two-light geometric windows to the left and right bays, topped with a wall head stack to the left.

The glazing comprises predominantly stained glass, especially on the west and north elevations; diamond and square quarries are on the south elevation, and plain glazing is on the east elevation. The roof is pitched and graded with slate, and has ashlar coped skewes with gableted skewputts.

A boundary wall, primarily of random rubble with saddle-back coping, runs along the south side. A low squared snecked rubble wall with modern metal railings and square gate-piers, topped with chamfered caps and pyramidal tops, is present.

The interior contains original timber pews, largely unplastered walls, late 19th-century stained glass on the west and south walls, and some 20th-century windows on the east wall. A raking gallery, supported by timber Corinthian columns, runs along the rear, alongside a timber cornice and a corbel table which supports a king post roof with a boarded barrel ceiling in the centre and quadrant-section timber-boarded ceilings on the flanks. The entrance lobby includes war memorial plaques, a marble wall memorial to George Ure, a stained glass lantern, and a curving gallery stair with cast iron balusters. The hall is now subdivided and features a moulded cornice and two cast iron supporting columns.