Llwyn Onn is a Grade II listed building in the Denbighshire local planning authority area, Wales. First listed on 8 May 1973. House. 4 related planning applications.
Llwyn Onn
- WRENN ID
- knotted-tin-fen
- Grade
- II
- Local Planning Authority
- Denbighshire
- Constituency
- Clwyd East MP: Becky Gittins (Lab)
- Country
- Wales
- Date first listed
- 8 May 1973
- Type
- House
- Address
- Llwyn Onn, Llanarmon Yn Ial, Ruthin, Llanarmon-Yn-Ial, CH7 4QE
- OS grid reference
- SJ 190 562
- Coordinates
- 53.09729, -3.21071
- Source
- Cadw listing
Description
Llwyn Onn is a house dating from the 18th century. It is constructed of whitewashed rubble stone with a slate roof and stacks built of squared stone, the left-hand stack being larger. The house has two storeys, with 20th-century casement windows set under the eaves. There are two windows under the eaves and two similar windows below, while the centre of the front elevation has another similar 20th-century window above a date plaque reading 'IGF 1749'. A 20th-century porch is positioned centrally to the right-hand side of the building.
Local climate
Llwyn Onn receives an average of 920 mm of rain a year. This makes it wetter than 70% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 75% of listed buildings.
It experiences an average of 37 freeze-thaw cycles a year, more than 69% of listed buildings. Of these, 20 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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- Full EPC report — heating system, energy costs, size, glazing, construction etc.
- Sale history — 9 transactions since 1997
- Related listed building consents — 4 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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