Secondary House at Garth Isaf is a Grade II listed building in the Snowdonia National Park local planning authority area, Wales. First listed on 1 February 1995. House.
Secondary House at Garth Isaf
- WRENN ID
- old-quartz-rye
- Grade
- II
- Local Planning Authority
- Snowdonia National Park
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 1 February 1995
- Type
- House
- Address
- Secondary House at Garth Isaf, Arthog, Gwynedd
- OS grid reference
- SH 653 159
- Coordinates
- 52.72471, -3.9951
- Source
- Cadw listing
Description
Garth Isaf is a late 17th century, two-storey house, possibly a former dower house, which was altered in the 19th century. It is built of rubble with an old slate roof and features an end chimney on the northwest gable, complete with weather coursing and well-moulded capping. The southwest, or main, façade is set behind a low coped rubble wall and has an off-centre entrance on the left with a boarded door. To the left of the entrance is a modern six-pane window, while to the right is a small four-pane casement window. There is another door on the far right, with a small two-pane window to the left of it. Under the eaves, there are four small, equally spaced four-pane casement windows with projecting slate cills.
Stone steps lead up to the entrance on the left side at the rear, which has a boarded door. In front of this entrance is a small dwarf-rubble-walled enclosure, and to the right at ground level is a boarded, shuttered window. There is also a blocked window opening to the right, featuring a projecting slate lintel.
Attached to the left gable end is a small, single-storey addition with a rubble gable parapet and an old slate roof, which has weather coursing where it meets the main block. This addition has a boarded door at the rear and a modern window on the northwest side.
Inside, there is a part-cobbled floor, a large blocked fireplace at the left gable end, and some stop-chamfered ceiling beams.
Local climate
Secondary House at Garth Isaf 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
- 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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