Trergelli is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 1 February 1988. House. 5 related planning applications.
Trergelli
- WRENN ID
- crumbling-window-moss
- Grade
- II
- Local Planning Authority
- Brecon Beacons National Park
- Constituency
- Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
- Country
- Wales
- Date first listed
- 1 February 1988
- Type
- House
- Address
- Trergelli, 3 Oxford Road, Hay, Powys, HR3 5AJ
- OS grid reference
- SO 229 422
- Coordinates
- 52.07316, -3.12553
- Source
- Cadw listing
Description
Trergelli is a symmetrical, two-storey, five-window house built of coursed rubble, with a basement to one side. The house likely dates to the 18th century. The slate roof has wide, boarded eaves and brick chimney stacks positioned centrally on both properties. The windows are 12-pane sashes with decorative voussoirs above, and there’s a blind window in the centre of the front facade. A raised, twin central doorcase features pilasters and panelled reveals, with six-pane doors and overlights. Steps lead down to a boarded basement entrance on the right, featuring a drip board. There are casement windows in the gable ends, with the right side colour-washed. The rear elevation is almost symmetrical, with wide eaves and slightly set back outer bays. Various windows are present, including small-pane sashes and staircase windows, with French windows on the right rear over the basement. Original iron railings remain in front of the property, enhancing its group value.
Local climate
Trergelli receives an average of 900 mm of rain a year. This makes it wetter than 67% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 54% of listed buildings.
It experiences an average of 52 freeze-thaw cycles a year, more than 93% of listed buildings. Of these, 29 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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- Full EPC report — heating system, energy costs, size, glazing, construction etc.
- Sale history — 1 transaction since 2012
- Related listed building consents — 5 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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