Maesderwen is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 17 January 1963. Country house. 1 related planning application.

Maesderwen

WRENN ID
hushed-pediment-dawn
Grade
II
Local Planning Authority
Brecon Beacons National Park
Constituency
Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
Country
Wales
Date first listed
17 January 1963
Type
Country house
Address
Maesderwen, Llanfrynach, Powys, LD3 7AX
OS grid reference
SO 068 257
Coordinates
51.92252, -3.35594
Source
Cadw listing

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

Description

Maesderwen is a country house dating from the 18th century. The main block is square, three-stories high and two bays wide, with a pyramid roof. It has deep, flat eaves and tall rendered side stacks. The front wall facing the main garden is constructed of Bath stone ashlar, while the rest of the house is unpainted stucco. Flanking the main block are two-story, hipped wings, each a single bay wide. The wings have rendered bow fronts and moulded eaves. Hornless sash windows are a feature throughout.

The garden front is particularly distinguished by a Bath stone facade with French windows on the ground floor, a sill band below two 12-pane sash windows on the first floor, and another sill band below six-pane square sash windows in the attic, set under the eaves. These bands project forward over thin and a broad central pier. A delicate and decorative wrought iron trellis, without glazing and featuring a tented roof, spans the front of the ground floor. The trellis has tapering openwork uprights and small spandrel pieces in the upper corners. Canted bays on the outer sides connect to the bowed wings.

The wings' rendered bow fronts have ashlar plinths. They feature French windows below and large 12-pane sashes above, all set under moulded timber eaves. The roofs are canted and hipped at the outer southeast and northeast angles, however the south wing has a regular hip to the rear southwest, while the north wing’s corner is splayed northwest with a canted hip. The north wing’s north side has a blind window and a 12-pane sash on the first floor, above a single-story extension with a dentilled cornice over two 16-pane sashes in reveals continued to the ground. This extension has floating ashlar capitals below the cornice at the outer angles. An ashlar plinth is present, broken forward at the angles. The west side of the north wing has a 12-pane sash above a blocked door, while the west side of the south wing has a blank window above a long 15-pane sash that illuminates the service stair.

The main block’s front is rendered with six-pane attic windows, 12-pane first-floor windows, and a small window on the ground floor to the right, lighting a stairwell. This front is flanked by a large, off-centre, irregular classical porch. The porch is enclosed and flat-roofed, with a timber entablature and dentil cornice over a three-bay front. The right bay is wider than the left; both have windows with marginal panes and moulded timber architraves. The centre bay features a six-panel door with a large two-pane overlight, also in a similar architrave, and is accessed via an interior double half-glazed door with a fanlight.

Two single-story hipped-roof service ranges are attached to the south side of the house. One, set back to the left of the garden front, has a door and two 12-pane sashes, with a tall rendered chimney off-centre on the ridge and an arched doorway with a six-panel door and fanlight in the south end. This range partially encloses the south side of an entrance courtyard.

The interior has not been inspected.

Local climate

Maesderwen sits in one of the wettest parts of the UK, with an average of 1,260 mm of rain a year. This makes it wetter than 93% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 82% of listed buildings.

It experiences an average of 56 freeze-thaw cycles a year, more than 96% of listed buildings. Of these, 32 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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  • Related listed building consents — 1 application
  • 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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