St Marys Parish Church is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 2 August 1988. A Medieval Church.

St Marys Parish Church

WRENN ID
south-soffit-umber
Grade
II
Local Planning Authority
Gwynedd
Constituency
Bangor Aberconwy MP: Claire Hughes (Lab)
Country
Wales
Date first listed
2 August 1988
Type
Church
Period
Medieval
Address
St Marys Parish Church, Bangor
OS grid reference
SH 583 724
Coordinates
53.2303, -4.12368
Source
Cadw listing

Also on this page: flood risk · radon risk · weather exposure · detailed attributes ↓

Description

St Mary's Parish Church is a Grade II listed building in the Decorated Gothic style. It features a six-bay aisled nave with a southwest porch, a lower two-bay chancel, and a southwest four-stage tower topped with an octagonal spire. The church is constructed of rubble with a freestone spire and decorative elements such as crucifix finials, plinth bands, quoins, and stepped and diagonal buttresses, which are gabled at the west and east ends. The roofs are slate, and the doors are boarded.

The exterior includes pointed trefoil clerestory windows and three-light aisle windows with varied cusped tracery. The windows adjacent to the porch have blind panels below, as do the aisle windows at the west end. The entrance features a Caernarfon arch doorway with a pointed trefoil tympanum and carved spandrels beneath a rere arch, accessed by a parallel flight of stone steps. The spire has small lucarnes, and the gabled bell stage includes two-light openings, with punched trefoils and paired lancets below. The east window has four lights with a stopped label and a curved-sided triangle gable window above. A lean-to vestry on the north side has a Y-tracery window and a stone chimney. There is a north entrance directly opposite the south porch, featuring a gabled arch with geometrical tracery. The west window has five lights with a label and stellar pattern tracery, along with a similarly shaped gable window above.

Inside, the church has a six-bay nave with a two-order chamfered arcade and thin octagonal piers that lack capitals. The nave features a scissors truss rood, which is boarded to the chancel, and broad aisles. The interior is adorned with Gothic furnishings and a notable stained glass window on the south side.

Local climate

St Marys Parish Church sits in one of the wettest parts of the UK, with an average of 1,210 mm of rain a year. This makes it wetter than 92% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 90% of listed buildings.

It experiences an average of 37 freeze-thaw cycles a year, more than 67% of listed buildings. Of these, 19 follow at least 1 mm of rain in the preceding 48 hours. Average temperatures at this location have risen by 0.3°C per decade since 1991.

Averages for 1991–2020; temperature trend 1991–2025. Figures describe the wider area (a grid cell of roughly 10 km), not the individual site. Contains modified Copernicus Climate Change Service information 2026.

More on this building

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