Barn at Llwyn Onn Bach is a Grade II listed building in the Snowdonia National Park local planning authority area, Wales. First listed on 31 January 1995. Lodge. 1 related planning application.

Barn at Llwyn Onn Bach

WRENN ID
ruined-sentry-dawn
Grade
II
Local Planning Authority
Snowdonia National Park
Constituency
Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
Country
Wales
Date first listed
31 January 1995
Type
Lodge
Address
Barn at Llwyn Onn Bach, Barmouth, Gwynedd
OS grid reference
SH 627 178
Coordinates
52.74046, -4.03386
Source
Cadw listing

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

Description

The barn at Llwyn Onn Bach is a rubble structure with part boulder foundations, rubble gable parapets, and a slate roof, which is partly built onto rock. It likely dates from the late 17th century and is probably contemporary with the nearby cottage. The barn features a central raised entrance on the farmyard side and ventilation slits at both gable apexes. There is an additional plain entrance on the south gable, along with a loading bay on the north side, which has modern boarded doors. Inside, the barn has a three-bay layout supported by crude collar trusses.

Local climate

Barn at Llwyn Onn Bach sits in one of the wettest parts of the UK, with an average of 1,390 mm of rain a year. This makes it wetter than 97% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 95% of listed buildings.

It experiences an average of 28 freeze-thaw cycles a year, fewer than 69% of listed buildings. Of these, 13 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 — 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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Nearby listed buildings

  1. Llwyn Onn Bach Farmhouse Grade II 16 m
  2. Stables/Cartshed at Llwyn Bach Grade II 30 m
  3. Llwyn Onn Isaf Farmhouse Grade II 244 m
  4. Former Farmhouse at Sylfaen Grade II 813 m
  5. Adjacent Former Wash House Grade II 868 m
  6. Bodowen Grade II 883 m
  7. Summerhouse at Glan-y-Mawddach Grade II 1.1 km
  8. Decorative Garden Gates and Gate Piers at Glan-y-Mawddach Grade II 1.1 km
  9. Former Cowhouse and hay-barn at Glandwr Grade II 1.1 km
  10. Former Stable Range at Glandwr Grade II 1.2 km