Tonfanau is a Grade II listed building in the Snowdonia National Park local planning authority area, Wales. First listed on 25 April 1996. Commercial.
Tonfanau
- WRENN ID
- ghost-gable-winter
- Grade
- II
- Local Planning Authority
- Snowdonia National Park
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 25 April 1996
- Type
- Commercial
- Address
- Tonfanau, Llangelynin, Gwynedd
- OS grid reference
- SH 562 037
- Coordinates
- 52.61201, -4.12501
- Source
- Cadw listing
Description
Tonfanau is a large 1½-storey house that includes a main range with a rear wing, which is the original part of the house, and a cross wing that serves as a secondary dwelling and cart house. The building is constructed of rubble stone with a slate roof, although part of the roof was missing at the time of inspection. The main range faces east and features a stone stack on the right and a replacement brick stack on the left. The entrance is offset to the right, but the door is missing. There are four windows that are not evenly placed, with the third window in the center being narrower and retaining some glazing bars from former sash windows. The house has three dormers that were once covered by raked hoods. At the rear, there is a short wing on the right that has a corbelled stack on the first floor. To the right of this wing is an inserted attic window, and the right side wall contains an original window opening.
The cross wing, which faces north, functions as the secondary dwelling. It has a central entrance flanked by windows and features three dormers. There is a lower extension with one window set back to the right, which has a separate doorway and an end stack. Attached to the left end is a two-bay cart house and granary that has openings under lintels. The gable end of the cart house includes stone steps leading to the granary entrance. The rear of the secondary dwelling, which faces the front of the main range, has two dormers with sash windows and a sash window located on the lower right.
Most of the original roof structures are intact, although much of the partitioning dates from the 19th century. In the main range, there is a large blocked fireplace on the north end with a deep timber chamfered lintel, and a smaller fireplace at the south end. Many beams are plastered over, but some chamfered joists remain, especially in the rear wing, where the first-floor fireplace features a chamfered timber lintel. The secondary dwelling has a staircase roughly opposite the doorway, with a stone spine wall to the left, and it also includes chamfered beams and joists. Additionally, a bakehouse retains its bread ovens.
Local climate
Tonfanau sits in one of the wettest parts of the UK, with an average of 1,380 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 23 freeze-thaw cycles a year, fewer than 76% of listed buildings. Of these, 9 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
- No related consent applications matched
- 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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