Church of St Mary is a Grade II* listed building in the Gwynedd local planning authority area, Wales. First listed on 30 March 1951. Church. 1 related planning application.

Church of St Mary

WRENN ID
strange-portal-soot
Grade
II*
Local Planning Authority
Gwynedd
Constituency
Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
Country
Wales
Date first listed
30 March 1951
Type
Church
Address
Church of St Mary, Tremadog, Porthmadog, LL49 9RA
OS grid reference
SH 562 400
Coordinates
52.93869, -4.14033
Source
Cadw listing

Also on this page: sale history · EPC · related consents · flood risk · radon risk · weather exposure · detailed attributes ↓

Description

The Church of St Mary is a building of probable 17th-century origin, although extensively altered and renovated in the 19th and 20th centuries, comprising a west tower with a spire, a nave with shallow transepts, and a chancel. The exterior is constructed of roughly dressed, squared and coursed Moel y Gest granite boulders, with late 19th-century freestone dressings to the windows. Slate roofs cover the structure. It is designed in the Gothic style.

The three-stage west tower features angle buttresses. An arched doorway with voussoirs provides the main entrance to the church, now with modern outer doors. A tower entrance is located up steps in the north wall, and a two-light window sits above, with blind recesses to the north and south. A moulded cornice precedes the bell stage, which has splayed angles with incised crosses and paired foiled lancet windows on the primary faces, with clock faces or matching roundels above, set below a moulded cornice. An embattled parapet tops the tower, leading to a rendered-over-brick spire with two tiers of lucarnes.

The nave has three bays, moulded stone eaves, and a shallow pitched roof. The windows consist of paired plate-traceried lights within freestone surrounds, featuring voussoirs and hood moulds. The remains of lower, earlier openings are visible below the later windows. The shallow transepts have close-eaved roofs, the result of a 1958 restoration, and similar windows. A lean-to vestry with a long porch adjoins the south transept to the east. The east window, of plate-traceried design with three lights, also shows evidence of a predecessor.

The inner doors at the west entrance are possibly original, featuring paired, simply traceried doors with quatrefoils pierced in the mid-rail. The interior is relatively simple, featuring a shallow roof with five trusses, including curved braces to the collar, short king posts, and struts. The nave and short chancel are not structurally separated; the boundary is marked by late 19th-century raised steps with mosaic inlay by J C Edwards of Ruabon.

Notable fittings include simple communion rails, and a fine altar and reredos designed by C R Ashbee and carved by Emile de Vynck, a Belgian carver living in Pentrefelin. This ensemble was commissioned in memory of Randall Casson, agent to the Tremadoc estate between 1896 and 1911, and installed in 1917, displaying a Renaissance style with three articulated panels between pilasters ornamented with stylised foliage, urns, and vine trails. An inscription is present in the central panel of the altar, with emblems of the passion superimposed on simple shields in the flanking panels. A pulpit, carved by Constance Greaves of Wern Manor around 1895, is in a Jacobean style. A Bates organ from 1857 is located in the north transept. Stained glass depicting the Baptism of Christ, in memory of John Whitehead Greaves and his wife Ellen, was installed in the east window in 1899. A marble memorial tablet on the north wall of the nave commemorates John Williams, agent to Madocks, and was created by Spence & Son of Liverpool.

Local climate

Church of St Mary sits in one of the wettest parts of the UK, with an average of 1,490 mm of rain a year. This makes it wetter than 98% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 97% of listed buildings.

It experiences an average of 32 freeze-thaw cycles a year, fewer than 60% of listed buildings. Of these, 15 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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  • Full EPC report — heating system, energy costs, size, glazing, construction etc.
  • Sale history — 3 transactions since 1996
  • Related listed building consents — 1 application
  • Detailed attributes — period, style, materials, features
  • Flood risk assessment
  • Radon risk assessment
  • Weather exposure and heating demand — rain and frost month by month and year by year, wind direction, solar and humidity
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