Barn at Plas Tregayan is a Grade II listed building in the Isle of Anglesey local planning authority area, Wales. First listed on 11 June 2002. Barn.

Barn at Plas Tregayan

WRENN ID
cold-string-claret
Grade
II
Local Planning Authority
Isle of Anglesey
Constituency
Ynys Môn MP: Llinos Medi (PC)
Country
Wales
Date first listed
11 June 2002
Type
Barn
Address
Barn at Plas Tregayan, Tregaian, Llanddyfnan
OS grid reference
SH 453 794
Coordinates
53.28957, -4.32124
Source
Cadw listing

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

Description

The Barn at Plas Tregayan is a three-bay threshing barn constructed from rubble masonry, dating back to an unspecified period. The main facade faces an enclosed cobbled courtyard to the northwest and features dressed coursed stone with a slightly advanced plinth and eaves course. It has wide opposing doorways topped with shallow basket arched heads, which include slightly advanced keystones and chamfered jambs, alongside flanking ventilation slits. The barn is topped with a shallow pitched gable roof made of large slates arranged in diminishing courses.

At the rear, there is a modern agricultural lean-to addition with a profiled roof supported by timber and metal uprights. Inside, the roof structure includes two king post trusses, but the floor was not visible during the survey.

Local climate

Barn at Plas Tregayan sits in a wetter-than-average part of the UK, with an average of 1,070 mm of rain a year. This makes it wetter than 86% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 91% of listed buildings.

It experiences an average of 14 freeze-thaw cycles a year, fewer than 87% of listed buildings. Of these, 5 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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  • 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. Stable range at Plas Tregayan Grade II 33 m
  2. Garage/coach house range at Plas Tregayan Grade II 36 m
  3. Gatepiers at Upper Lodge driveway to Plas Tregayan Grade II 66 m
  4. Gatepiers to main driveway to Plas Tregayan Grade II 92 m
  5. Plas Tregayan Grade II 108 m
  6. Gatepiers at Upper Lodge entrance to Plas Tregayan Grade II 281 m
  7. Gatepiers to church path at Plas Tregayan Grade II 314 m
  8. Church of St Caian Grade II* 337 m
  9. Bridge at Plas Tregayan Grade II 473 m
  10. Gatepiers at Lower Lodge entrance to Plas Tregayan Grade II 659 m