Trewern is a Grade II listed building in the Powys local planning authority area, Wales. First listed on 29 August 2003. Farmhouse.

Trewern

WRENN ID
dark-sill-swallow
Grade
II
Local Planning Authority
Powys
Constituency
Montgomeryshire and Glyndwr MP: Steve Witherden (Lab)
Country
Wales
Date first listed
29 August 2003
Type
Farmhouse
Address
Trewern, Llanrhaeadr-Ym-Mochnant
OS grid reference
SJ 135 262
Coordinates
52.82711, -3.28388
Source
Cadw listing

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

Description

Trewern is a large farmhouse built in a style that features quasi-rubble masonry, with a low rendered porch on the north side that is likely made of brick and painted white. The building has a slate roof with tile ridges, and the newer part has a taller triple roof compared to the original house. Yellow brick chimneys are located at both ends and in the middle.

The north elevation of the original range has three windows, featuring 12-pane horizontally sliding sash windows on the upper level and a single 16-pane sash window below. There is a low modern lean-to porch on the left side.

The south elevation, designed in the 19th century to serve as the front, is the most prominent feature of the farmhouse. It consists of three gables, with a datestone in the central gable that reads 'Rebuilt by / William and Mary Morris / 1867'. The left and center gables have a three-window arrangement with vertically aligned 16-pane sash windows and a central semi-glazed main door. The windows have stone sills and timber lintels, and the left ground storey window is set in a small canted bay. The doorway is framed by a timber porch with brick footings, a slate roof, and lattice panels. The right gable features two similar upper windows positioned lower, with the outline of a bricked-up attic window above and a small window below. There is one similar window on the east elevation and two on the west elevation. Most of the sashes are hornless, although several have been restored with horns.

Inside, the hallway at the 19th-century entrance has straight stairs on one side. The stairs in the central unit of the earlier north range are now secondary. A large lateral farmhouse chimney is located in the west unit, along with stop-chamfered main beams and rough joists. There is a boxed-in oven believed to still exist in the east unit.

Local climate

Trewern sits in a wetter-than-average part of the UK, with an average of 960 mm of rain a year. This makes it wetter than 75% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 61% of listed buildings.

It experiences an average of 45 freeze-thaw cycles a year, more than 86% of listed buildings. Of these, 25 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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