Penallta Colliery Pit-top Offices is a Grade II listed building in the Caerphilly local planning authority area, Wales. First listed on 5 November 1991. Office.
Penallta Colliery Pit-top Offices
- WRENN ID
- hallowed-truss-auburn
- Grade
- II
- Local Planning Authority
- Caerphilly
- Constituency
- Caerphilly MP: Chris Evans (Lab)
- Country
- Wales
- Date first listed
- 5 November 1991
- Type
- Office
- Address
- Penallta Colliery Pit-top Offices, Penalltau, Ystrad Mynach, Gelligaer
- OS grid reference
- ST 139 957
- Coordinates
- 51.65365, -3.24553
- Source
- Cadw listing
Description
Penallta Colliery Pit-top Offices were built to serve as 'dirty' offices for officials who regularly visited the underground workings. The offices are designed in the same style as the original colliery buildings, constructed from Pennant sandstone that has been rendered, with red brick detailing. This includes dentilled surrounds for the windows and doors, which feature keystones, pilasters, a plinth, and a cornice. The roof, which was originally covered with slate and had ridge tiles, has now been stripped. The building is gabled along a north-south axis and is a single-storey structure, measuring five bays long and two bays wide. The main east-facing elevation has four segmental arched windows and a central door, all of which are now blocked. The gable end features two similar windows and a door. The interior is divided into offices.
Local climate
Penallta Colliery Pit-top Offices sits in a wetter-than-average part of the UK, with an average of 1,090 mm of rain a year. This makes it wetter than 87% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 79% of listed buildings.
It experiences an average of 44 freeze-thaw cycles a year, more than 85% 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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