Trefadog is a Grade II listed building in the Isle of Anglesey local planning authority area, Wales. First listed on 5 April 1971. Farmhouse.

Trefadog

WRENN ID
rooted-flint-autumn
Grade
II
Local Planning Authority
Isle of Anglesey
Constituency
Ynys Môn MP: Llinos Medi (PC)
Country
Wales
Date first listed
5 April 1971
Type
Farmhouse
Address
Trefadog, Porth Trefadog, Holyhead, Llanfaethlu
OS grid reference
SH 292 861
Coordinates
53.3445, -4.56598
Source
Cadw listing

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

Description

Trefadog is a sub-medieval farmhouse with later Georgian details. It is a two-storey building with a four-window range and a single-storey addition at the northwest corner. The layout features a cross passage plan with the doorway offset to the right (north), two bays to the left of the entrance, and one bay to the right, with unaligned upper and lower windows. The structure is built of stone and is pebbledash rendered. It has a modern slate roof with a slate ridge and tall rendered stacks, including gable stacks and one ridge stack to the left (south) of the door. There are gabled half dormers on the first floor, with four along the front (east) entrance elevation and two at the rear (south end). The windows are recessed hornless sash windows, with 16 panes on the ground floor and 9 panes on the first floor, all featuring slate sills. The addition has modern casement windows.

The interior was stripped prior to the current ownership in the 1980s, but it still retains the original cross passage plan, a large cambered bressumer over the inglenook fireplace, and one of the original full crucks.

Local climate

Trefadog sits in a wetter-than-average part of the UK, with an average of 1,030 mm of rain a year. This makes it wetter than 83% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 93% of listed buildings.

It experiences an average of 8 freeze-thaw cycles a year, fewer than 93% 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 0.3°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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