Plas y Glyn is a Grade II listed building in the Isle of Anglesey local planning authority area, Wales. First listed on 16 February 2001. Farmhouse.

Plas y Glyn

WRENN ID
sharp-pavement-laurel
Grade
II
Local Planning Authority
Isle of Anglesey
Constituency
Ynys Môn MP: Llinos Medi (PC)
Country
Wales
Date first listed
16 February 2001
Type
Farmhouse
Address
Plas y Glyn, Llanfwrog, Holyhead, Llanfaethlu
OS grid reference
SH 294 842
Coordinates
53.32796, -4.56201
Source
Cadw listing

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

Description

Plas y Glyn is a large farmhouse built in the 18th century, featuring a traditional Georgian layout with distinctive Gothic details. The building is two stories high with attics and has a three-window front, along with a service wing at the back that forms a T-shaped plan. To the right (north) is a single-storey gabled outhouse. The farmhouse is constructed from roughly dressed stone laid in courses, with a plinth on the front elevation, while the rear and side elevations are covered in pebbledash render. The slate roof is laid in diminishing courses and has stone copings, along with tall rendered rectangular gable stacks topped with capping.

The main elevation faces east and features a three-window arrangement with a central entrance accessed through a gabled porch. This porch includes a plinth and a projecting string course, with a hood mould over a four-centred archway that displays a datestone and emblem at the top. The inner door is half-glazed and has an overlight with lozenge glazing. The flanking windows are 12-pane sashes, also with lozenge glazing in the upper sections. The first floor has mullioned and transomed windows with two and three lights, featuring similar lozenge glazing. The attic storey has two broad gables and a smaller central gabled dormer, each with a small paned window that also has lozenge glazing. All windows are adorned with drop-ended hood moulds.

The other elevations of the house are pebbledash rendered, with the rear featuring modern windows and doors. The gabled outbuilding to the right (north) is made of rubble masonry, with its rear wall rendered. On the right return, there are two windows, each with small panes in the upper light above a single paned fixed light below, and the lower lights have dentilled edges at the top and bottom. There is also a single boarded door at the rear.

Local climate

Plas y Glyn 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
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  • 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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  1. Cartshed-granary range, Plas y Glyn Grade II 28 m
  2. Corn barn and stable range, Plas y Glyn Grade II 44 m
  3. Churchyard walls and outbuilding, Church of St Mwrog Grade II 759 m
  4. Church of St Mwrog Grade II 788 m
  5. Gateposts and wall, Uwch y don Grade II 1.2 km
  6. Uwch y don Grade II 1.2 km
  7. Bodlasan Fawr Grade II 1.5 km
  8. Agricultural range, Bodlasan Fawr Grade II 1.6 km
  9. Servant's quarters or secondary house, Bodlasan Fawr Grade II 1.6 km
  10. Penrallt Grade II 1.8 km