Pen-Isa'r-Llan is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 31 January 2001. House.
Pen-Isa'r-Llan
- WRENN ID
- empty-soffit-linden
- Grade
- II
- Local Planning Authority
- Gwynedd
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 31 January 2001
- Type
- House
- Address
- Pen-Isa'r-Llan, Llanfor, Bala, Llandderfel
- OS grid reference
- SH 939 366
- Coordinates
- 52.91659, -3.57929
- Source
- Cadw listing
Description
Pen-Isa'r-Llan is a two-storey late Georgian house that showcases some ambition in its design. It features a main L-shaped range with a rear wing and a long, low adjoining wing to the northwest. The building is constructed of rubble with a rendered facade and a slate roof, complete with end chimneys. The symmetrical facade has three bays, with a central entrance that includes a part-glazed 20th-century door and a modern Tuscan pedimented porch.
The original sash windows are recessed and unhorned, featuring flat-arched slate lintels and projecting sills. The lower range, which adjoins to the left, is unrendered and has a 20th-century round-arched multi-pane window at its gable end, along with a uPVC glazed window to the left. The long, road-facing side has six additional modern windows, which include both multi-pane wooden and uPVC glazing. There is a modern brick central chimney and brick quoins on the gable end to the left. Attached to this gable end is a lower rubble block with a modern roof, which has blocked-up ventilators and a modern window in the gable end loading bay.
The interior was not inspected during the survey.
Local climate
Pen-Isa'r-Llan sits in one of the wettest parts of the UK, with an average of 1,190 mm of rain a year. This makes it wetter than 91% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 80% of listed buildings.
It experiences an average of 53 freeze-thaw cycles a year, more than 94% of listed buildings. Of these, 33 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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