Y Rheithordy is a Grade II listed building in the Snowdonia National Park local planning authority area, Wales. First listed on 4 November 1999. House.

Y Rheithordy

WRENN ID
tattered-cinder-kestrel
Grade
II
Local Planning Authority
Snowdonia National Park
Constituency
Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
Country
Wales
Date first listed
4 November 1999
Type
House
Address
Y Rheithordy, Mallwyd, Machynlleth, Mawddwy, Gwynedd
OS grid reference
SH 863 122
Coordinates
52.69633, -3.68338
Source
Cadw listing

Also on this page: flood risk · radon risk · weather exposure · detailed attributes ↓

Description

Y Rheithordy is a two-storey building with an attic and cellar, constructed from local stone rubble and topped with slate roofs. It has a 'T'-plan layout, with the main front elevation facing north. The symmetrical façade features three bays and a central gabled porch from the 20th century. On either side of the porch, there are four-paned windows in the main reception rooms. The first floor has 16-pane sash windows, and the attic features two gabled dormers with two lights each. Recessed gable chimney stacks are located at both ends of the building. The rear wing has a hipped roof and an axial stack. On the west side, there is a slated lean-to that extends the service arrangements and includes a 20th-century glazed porch. The south end of the T-wing has 12-pane sashes on both the ground and first floors.

Although not accessible during the inspection, it is reported to contain evidence of an earlier house, including a large inglenook fireplace in the dining room, which is enclosed by later work. Transverse beams from the early 17th century are said to survive, along with some roof work from that period. Additionally, there is a plain oak stair dating from the late 18th century or early 19th century.

Local climate

Y Rheithordy sits in one of the wettest parts of the UK, with an average of 1,240 mm of rain a year. This makes it wetter than 93% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 87% of listed buildings.

It experiences an average of 47 freeze-thaw cycles a year, more than 88% of listed buildings. Of these, 26 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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