Millbrook House is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 19 November 1998. A Georgian House.

Millbrook House

WRENN ID
bitter-granite-barley
Grade
II
Local Planning Authority
Brecon Beacons National Park
Constituency
Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
Country
Wales
Date first listed
19 November 1998
Type
House
Period
Georgian
Address
Millbrook House, the Vale of Grwyney, Powys
OS grid reference
SO 239 171
Coordinates
51.84783, -3.10519
Source
Cadw listing

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

Description

Millbrook House is a Georgian-style, five-bay house that stands two storeys tall with an attic. The exterior features rubble stone walls and a roughcast front with raddle, which has some repairs painted pink. The slate roof has an external stack on the left and an end stack on the right, both of which have been replaced with brick. The windows show traces of former architraves and consist of 12-pane hornless sashes. The centrally-placed doorway is framed by a moulded surround and features a six-panel door with an overlight that has Gothick glazing.

To the left gable end, there is a single-storey former stable made of rubble stone, painted cream, with a slate roof. It has a boarded door at the centre of a former full-height opening that is now blocked above the door. To the left of the door is a 12-pane sash window, while to the right is a window that was inserted in the 20th century. The right gable end of the house is pebble-dashed and has a horned sash window inserted in the upper right. The rear wall features a small battered buttress at the left end, and centrally placed are 19th-century two-light casements that provide light to the stairs.

Inside, the central stair hall boasts a full-height open-well stair with turned balusters and a newel, along with a moulded handrail. There are plainer stairs leading to the service rooms in the attic. The ground floor includes two main rooms, where the windows are fitted with panelled shutters, and the panelled doors have moulded surrounds.

Local climate

Millbrook House sits in a wetter-than-average part of the UK, with an average of 1,040 mm of rain a year. This makes it wetter than 83% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 75% of listed buildings.

It experiences an average of 48 freeze-thaw cycles a year, more than 89% of listed buildings. Of these, 24 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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  • Flood risk assessment
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