Cascade House is a Grade II listed building in the Caerphilly local planning authority area, Wales. First listed on 18 July 2001. Residence.
Cascade House
- WRENN ID
- scattered-cobble-river
- Grade
- II
- Local Planning Authority
- Caerphilly
- Constituency
- Caerphilly MP: Chris Evans (Lab)
- Country
- Wales
- Date first listed
- 18 July 2001
- Type
- Residence
- Address
- Cascade House, Pen-Pedair-Heol, Gelligaer
- OS grid reference
- ST 145 978
- Coordinates
- 51.67287, -3.23746
- Source
- Cadw listing
Description
Cascade House is a substantial residence, originally a farmhouse, enlarged and upgraded for an industrialist. It dates to the 18th century with later additions. The building consists of a central farmhouse section and two later gabled cross wings at each end, with a further wing extending at the left end. It has two storeys and a cellar. The exterior is primarily of stone, mostly stucco-rendered and painted white, with the rear of the central wing unrendered. The roof is covered with Welsh slate, featuring overhanging boarded eaves and painted rendered stacks – a ridge stack to the central unit, and narrower rear and end stacks to the later wings. The central farmhouse section has a four-window front with small four-pane sash windows and sills. A similar window now occupies the space where a central doorway once stood, the blocked arch and roofline of the former porch remaining visible. The cross wings feature larger windows with six-pane sashes, with the side panes narrower. A French window with steps leading to the garden occupies the ground floor right, while the end-left wing has smaller panes in its tripartite windows. A corniced, flat-roofed porch is located in the angle between the left end wing and the cross wings, featuring a round-arched entrance and a deep side window. Further twelve-pane sashes, with narrow glazing bars and without horns, are found to the side and rear. A second porch with a basket-arched doorway is on the side right, alongside a blocked doorway. The rear side windows have cambered heads, and the rear farmhouse section has a central doorway flanked by side windows, one corner curved.
The porch has a large round-arched multipane side window. Inside, a hallway leads from the porch to a staircase with a wreathed ramped handrail and slender turned balusters (replacing earlier stick balusters). Doors are four-panelled with panelled reveals and moulded surrounds; similarly, the windows have moulded surrounds. The central farmhouse section, which has a substantially lower ceiling, is now a single room connected to the outer wings by lobbies. A large fireplace on the end-right wall contains a fireback from 1762 with a fleur-de-lys motif, likely referencing a nearby foundry, and the initials ‘WM’, believed to refer to William Morgan. Removal of plaster has revealed masonry laid in narrow courses. The end-right wing, previously a barn range and now a self-contained unit, retains a lower ceiling.
Local climate
Cascade House 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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- Former farm building at Cascade House
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- Police Court and Police Station, including forecourt walls, gates & railings
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- Penallta Colliery Engine Hall and Fan House