The church of St Catherine is located on the corner with Church Walks. It was built in 1837 as a chapel of ease to Llandrillo, and became a parish church when the parish of Colwyn was created in 1844. The building was twice restored later in the nineteenth century, and the internal fittings probably largely date from these restorations, c.1871 and c.1892.
The structure is built of very roughly-coursed and squared local limestone, roughcast render to chancel, and slate roofs. It has a west tower, an aisle-less nave and chancel, with vestry addition to the south. The tower is two-staged with wide lancet window to the west, and chamfered arched doorway to the south; with simple plain chamfered lights to the bell chamber, and a clock on north face. Other features include a stepped, embattled parapet with plain pinnacles at angles; a nave with coped gabled and buttressed porch and plain chamfered arch towards the north-west; intersecting tracery to a two-light window, with a broad lancet to the north-east of the nave, and north of chancel; a four-light east window with intersecting tracery.
Inside, a simple nave and chancel, the nave articulated as five bays by the principal arched braced collar trusses of its roof, though with only two windows in each side. These windows, together with the chancel north window, have emblematic stained glass using floral and foliage motifs on geometric forms in a series, and are signed and dated, Cox, Sons, Buckley and Co., 1886. A low stone screen divides the chancel from the nave. Encaustic tiled floor to sanctuary. Painted stencilled text surrounds both the chancel arch and the arch to organ chamber to the south. The chancel north and south walls are also covered with stencilled decoration, and to either side of the east window, painted metal panels illustrating biblical themes. Stained glass in the east window (the crucifixion with Saints Catherine and Asaph), is dated 1892 (and replacing an earlier window of 1844 by Clutterbuck).
(from Cadw Listing database)

RCAHMW, 3 October 2014