St Columba Church, Sinclair Street, Helensburgh

William Spence, 1860; offices/hall added later 19th century. Rectangular-plan Gothic church, advanced E (entrance) elevation with 3-stage tower to centre; L-plan offices abutting to NW angle. Squared, stugged and snecked cream sandstone; ashlar dressings. Base and eaves courses. Hoodmoulded, transomed pointed-arch windows with Y-tracery, cusped to E elevation and tower. Pointed-arch and hoodmoulded doorways; diagonal buttresses with saw-tooth coping and crenellated parapet to E elevation.

E (SINCLAIR STREET/ENTRANCE) ELEVATION: 3-bay elevation. 3-stage entrance tower to centre with off-set and gablet angle buttresses, slightly advanced doorway, 2-leaf boarded doors, half-piend ashlar roof, window above, louvered windows to belfry stage, blind pointed-arch and cusped tracery detail below corbel table, cornice, pierced stonework to parapet. Window to half-gable bay flanking tower to right, door on return to right with small window above, mirror image to left.

S (KING STREET EAST/SIDE) ELEVATION: 5 bays; 2 windows to taller gabled bay to outer right, circular window with quatrefoils to gablehead, apex stack. 3 windows to nave to left; door between 1st and 2nd window to left.

N ELEVATION: mirror image of S elevation.

W ELEVATION: projecting chancel with bipartite window to S elevation. Lead-pane glazing to windows with some small stained glass panels. Grey slate roof, cast-iron rainwater goods.

INTERIOR: vestibule, encaustic tiles, curved stone stairs to gallery. U-plan gallery supported on cast-iron columns with foliated capitals, blind pointed-arch and cusped tracery detail to gallery balcony.

Plaster ribbed semi-circular barrel vault to nave, coffered panels to aisles. Timber rood screen with pulpit abutting, organ behind in chancel.

Decorative marble baptismal font with winged angles to base.

OFFICES: single storey, L-plan. Grey stugged and snecked sandstone ashlar dressings. 3-bay link to NW angle of church with doorway set in advanced gabled bay to centre, small windows flanking. Adjoining wing with doorway and window in re-entrant angle, slightly taller block to right with 3 regular windows. Gabled E elevation with bipartite window to centre, louvered oculus to gablehead.

6-pane timber sash and case windows with frosted glass. Grey slate roof, ashlar coped skews, block skewputts, rendered stacks, moulded cans.