Gelli-groes Millhouse and attached Barn is a Grade II listed building in the Caerphilly local planning authority area, Wales. First listed on 26 February 1988. Millhouse and workshop. 2 related planning applications.
Gelli-groes Millhouse and attached Barn
- WRENN ID
- twelfth-render-poplar
- Grade
- II
- Local Planning Authority
- Caerphilly
- Constituency
- Caerphilly MP: Chris Evans (Lab)
- Country
- Wales
- Date first listed
- 26 February 1988
- Type
- Millhouse and workshop
- Address
- Gelli-groes Millhouse and attached Barn, Pontllanfraith, NP12 2HY
- OS grid reference
- ST 177 946
- Coordinates
- 51.64503, -3.18978
- Source
- Cadw listing
Description
Gelli-groes Millhouse and the attached barn is a 2-storey building set at an angle to the road, featuring a 3-window range house in the center, a 2-window range cottage to the right sharing the same ridge, and a single-storey barn range to the left that is now a workshop. The structure is built of roughcast rubble with a Welsh slate roof, and has a red brick end and ridge stack, while the workshop has a corrugated roof.
The central unit has 9-pane horned sash windows on the first floor and 12-pane sash windows on the ground floor, both with cambered heads. There is a central doorway with a 4-panelled door. The cottage unit to the right has replacement casement windows on the upper floor and retains a 6-pane sash window on the ground floor, along with a boarded door to the side. The workshop, made of limewashed rubble, features a low double doorway with a brick relieving arch flanked by additional doorways. The barn is currently used as a candlemaker's workshop.
Local climate
Gelli-groes Millhouse and attached Barn sits in a wetter-than-average part of the UK, with an average of 1,060 mm of rain a year. This makes it wetter than 85% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 81% of listed buildings.
It experiences an average of 32 freeze-thaw cycles a year, fewer than 59% 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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- Full EPC report — heating system, energy costs, size, glazing, construction etc.
- 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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