Cwm y Dwrgi is a Grade II* listed building in the Powys local planning authority area, Wales. First listed on 7 August 2002. House. 2 related planning applications.
Cwm y Dwrgi
- WRENN ID
- tattered-truss-plover
- Grade
- II*
- Local Planning Authority
- Powys
- Constituency
- Montgomeryshire and Glyndwr MP: Steve Witherden (Lab)
- Country
- Wales
- Date first listed
- 7 August 2002
- Type
- House
- Address
- Cwm y Dwrgi, Uwch Y Garreg, Machynlleth, Cadfarch, SY20 8RR
- OS grid reference
- SN 773 958
- Coordinates
- 52.54635, -3.81087
- Source
- Cadw listing
Description
Cwm y Dwrgi is a single-storey, four-unit house with a cross-wing, built from lime-washed rubble stone and topped with old slate roofs. There is a square stone chimney at the junction of the main range and the cross-wing, although the second chimney has fallen.
In the main block, starting from the left, there is an entrance to a store room featuring a boarded door and a 3-over-6-pane hornless sash window nearby. To the left of the center, there is a narrow 6-pane window set in a blocked doorway that originally led to a cross-passage. On the far right, beyond the cross-wing, there is a 20th-century part-lit wooden door. The cross-wing, which was built against the hall, is the third unit from the left. It has an entrance on the east side with a boarded door to the left and a casement window immediately under the eaves to the right, along with a small window at the rear of the wing. The rear of the main block features two sash windows and a small window that lights the dairy.
The main block comprises a single-bay hall with two service rooms (the dairy and 'gegin fach') at the upper end, a parlour on the downhill side of the hall, and a store at the lower end beyond a later stone wall. The roof structure consists of a series of tie-beam trusses with raking struts. There is a large lateral fireplace on the cross-wing side of the hall, which likely had a post-and-panel partition at the upper, dais end. The cross-wing contains a large fireplace that backs onto the hall fireplace.
Local climate
Cwm y Dwrgi sits in one of the wettest parts of the UK, with an average of 1,270 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 89% of listed buildings.
It experiences an average of 45 freeze-thaw cycles a year, more than 86% of listed buildings. Of these, 25 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
- Related listed building consents — 2 applications
- 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
Matched applications, energy data and sale records are assembled automatically and may contain errors. Flag incorrect data.
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