Terraces at High Glanau is a Grade II* listed building in the Monmouthshire local planning authority area, Wales. First listed on 22 February 1989. Church.

Terraces at High Glanau

WRENN ID
long-landing-tarn
Grade
II*
Local Planning Authority
Monmouthshire
Constituency
Monmouthshire MP: Catherine Fookes (Lab)
Country
Wales
Date first listed
22 February 1989
Type
Church
Address
Terraces at High Glanau, Mitchel Troy, Monmouth
OS grid reference
SO 498 074
Coordinates
51.76302, -2.72868
Source
Cadw listing

Also on this page: flood risk · radon risk · weather exposure · detailed attributes ↓

Description

The Terraces at High Glanau are a notable feature of the property, providing a picturesque garden front that overlooks a stone-paved terrace. This terrace is accessed by a central flight of steps and is flanked by tall piers, which once held classical urns that were stolen around 1990 when the property was on the market. Additional steps lead down to a lower terrace, where the piers previously had large ball finials, also stolen. The piers are arranged in pairs on either side, creating a division between the terraces and the surrounding lawns.

At the center of the lower terrace is an octagonal area featuring a sunken pond, bordered by a low perimeter wall that retains the bases of classical garden ornaments. At the southern end of the house, the terrace rises and is screened to the east by a stone wall that has half-round recesses on both sides. This wall includes a stone basin that plays a role in the property's hydraulic system. This system supplies water to a fountain from a reservoir located in the woods above the house, using underground pipes to transport the water to this point, and then further piping directs it to the fountain below. The water then flows a quarter of a mile downhill to a hydraulic ram, specifically a Blake Hydram Type A manufactured by John Blake Ltd of Accrington, which has recently been restored to full working condition by the current owner. The sheltered area of the terrace faces down an avenue that was formerly lined with herbaceous borders, leading towards the greenhouse and kitchen garden.

The Terraces at High Glanau hold group value with other listed items in the vicinity.

Local climate

Terraces at High Glanau receives an average of 820 mm of rain a year. This makes it wetter than 52% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 57% of listed buildings.

It experiences an average of 42 freeze-thaw cycles a year, more than 80% of listed buildings. Of these, 19 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.

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  5. Greenhouse at High Glanau Grade II 69 m
  6. Glanau Farm, Barn to S of Grade II 323 m
  7. Glanau Farm Grade II 350 m
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  9. Signpost Penalt/Trelleck Grade II 1.3 km
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