Porth y Castell is a Grade II listed building in the Isle of Anglesey local planning authority area, Wales. First listed on 30 June 1998. House. 7 related planning applications.
Porth y Castell
- WRENN ID
- north-lancet-linden
- Grade
- II
- Local Planning Authority
- Isle of Anglesey
- Constituency
- Ynys Môn MP: Llinos Medi (PC)
- Country
- Wales
- Date first listed
- 30 June 1998
- Type
- House
- Address
- Porth y Castell, Trearddur, Trearddur Bay
- OS grid reference
- SH 252 780
- Coordinates
- 53.27097, -4.62184
- Source
- Cadw listing
Description
Porth y Castell is an asymmetrically planned Arts and Crafts house, built as a single storey with attics on the left and a two-storey cross-wing at the upper right end. The walls are pebble-dashed rendered, and the roof is covered with small green slates, featuring broadly projecting wood-bracketted eaves and verges, along with a red-brick end wall and axial stacks.
The left range has a large hipped roof that extends forward over a central, double-fronted verandah. The right side of the verandah is now enclosed with walling at the lower part and has a large paned light at the front, while the left side remains open with railings made of shaped splats and stick balusters. Side windows consist of paired sashes with small-paned upper lights. To the right of the verandah, there is a similarly detailed window and a recessed entrance at the far right. To the left of the verandah, there is a bay window with four small-paned sash lights.
In the roof, there are two dormers, each featuring paired two-light casement windows with segmentally pedimented heads. The left gable return has windows similar to those on the sides of the verandah, including a single centrally placed light and a paired light at the rear. The gabled wing on the right has projecting verges over a jettied apex above a canted oriel window with five lights, as well as a canted ground-floor bay with seven small-paned lights.
The right return features a single-storey gabled verandah set at right angles to the left end, with a small-paned light positioned under the eaves above and a canted ground-floor bay containing five small-paned casement lights to the right. A central chimney stack has a wide rectangular base and raking sides that form the front of a gabled dormer, with the tall square stack continuing above.
Local climate
Porth y Castell 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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- No EPC on record for this property
- No sale records on file
- Related listed building consents — 7 applications
- 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
Matched applications, energy data and sale records are assembled automatically and may contain errors. Flag incorrect data.
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