Arch at Maes-y-Bryner Isaf is a Grade II listed building in the Snowdonia National Park local planning authority area, Wales. First listed on 20 July 1995. Folly-arch.
Arch at Maes-y-Bryner Isaf
- WRENN ID
- spare-steeple-hazel
- Grade
- II
- Local Planning Authority
- Snowdonia National Park
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 20 July 1995
- Type
- Folly-arch
- Address
- Arch at Maes-y-Bryner Isaf, Cymmer Castle, Llanelltyd, Gwynedd
- OS grid reference
- SH 739 200
- Coordinates
- 52.76344, -3.86913
- Source
- Cadw listing
Description
The arch at Maes-y-Bryner Isaf is an early 19th-century decorative folly built as an estate feature by Sir Robert Williames Vaughan of Nannau, Bart. It is designed in a rustic style and constructed from rubble. The arch is flanked by sections of wall that contain arched slits with projecting rubble cills and vernacular projecting voussoirs, topped with a plain string-course. Originally, the arch was capped to create a pedimented effect, and two large slate-stone lintel pieces that once served this purpose are located nearby.
Local climate
Arch at Maes-y-Bryner Isaf sits in one of the wettest parts of the UK, with an average of 1,360 mm of rain a year. This makes it wetter than 96% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 94% of listed buildings.
It experiences an average of 39 freeze-thaw cycles a year, more than 74% of listed buildings. Of these, 21 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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