Church of St Mary is a Grade II listed building in the Isle of Anglesey local planning authority area, Wales. First listed on 12 May 1970. Church.

Church of St Mary

WRENN ID
twelfth-cellar-weasel
Grade
II
Local Planning Authority
Isle of Anglesey
Constituency
Ynys Môn MP: Llinos Medi (PC)
Country
Wales
Date first listed
12 May 1970
Type
Church
Address
Church of St Mary, Llanerchymedd, Llannerch-Y-Medd
OS grid reference
SH 417 840
Coordinates
53.33005, -4.37748
Source
Cadw listing

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

Description

The Church of St Mary is a Grade II listed building designed in the Decorated style. It features a west tower with a bellcote, a nave, a chancel, and a south porch. The church is constructed from rubble masonry with freestone dressings and has a slate roof with stone copings.

The oldest part of the church is the west tower, which dates back to the 12th century. The lower stage of the tower now serves as the vestry and has narrow rectangular windows on the north, south, and west sides, along with narrow ventilation slots above. The upper bell stage features pointed-arched, louvred openings on each side, each adorned with cinquefoil tracery and hoodmoulds that have bestial stops. Above this, there is an embattled parapet over a moulded string, and the roof of the tower is topped with a single gabled sanctus bellcote facing east.

The newer section of the church, built in the mid-19th century, has a raking plinth and is divided into bays by stepped buttresses, with the chancel featuring an angled buttress to the east. The windows are a combination of two and three lights, showcasing cusped tracery and mostly pointed arches. The east end of the north and south walls of the chancel has rectangular-headed lights, while the east window contains three trefoil-headed lights set within a pointed-arched frame with a hoodmould.

The south porch includes pointed-arched doorways with chamfered frames; the inner doorway has a boarded door with large ornate hinges, and the side walls feature narrow rectangular lights.

The interior was not inspected during the survey, but it is noted by the Royal Commission on the Ancient and Historical Monuments of Wales (RCAHMW) to contain a small octagonal gritstone font with a chamfered base, likely from the 14th century, and a brass memorial tablet dedicated to Michael Llwyd from 1748/9. The doorway between the tower and the nave is described as round-headed with square abaci.

Local climate

Church of St Mary sits in a wetter-than-average part of the UK, with an average of 1,040 mm of rain a year. This makes it wetter than 84% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 92% of listed buildings.

It experiences an average of 10 freeze-thaw cycles a year, fewer than 91% of listed buildings. Of these, 3 follow at least 1 mm of rain in the preceding 48 hours. Average temperatures at this location have risen by 0.2°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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