Bryn Aderyn is a Grade II listed building in the Powys local planning authority area, Wales. First listed on 9 May 1988. House.

Bryn Aderyn

WRENN ID
deep-tower-mallow
Grade
II
Local Planning Authority
Powys
Constituency
Montgomeryshire and Glyndwr MP: Steve Witherden (Lab)
Country
Wales
Date first listed
9 May 1988
Type
House
Address
Bryn Aderyn, Newtown, Newtown and Llanllwchaiarn
OS grid reference
SO 109 916
Coordinates
52.51499, -3.31416
Source
Cadw listing

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

Description

Bryn Aderyn and Rosemount are a pair of houses built around 1810, featuring a Regency style. They are two stories high with a cellar and have three window bays. Bryn Aderyn has earlier origins. The houses are constructed from painted English garden wall bond brick and have gently pitched slate roofs with lead ridges. The eaves cornice is saw-toothed, and there are boxed lead gutters. Brick stacks are present on the roofs.

The second-floor windows have shallow upper sashes with 12 panes, while the windows above the doors have 9 panes. The ground floors feature large 16-pane sash windows flanking the doorways, and Rosemount includes louvred shutters on pintels. Architectural details include gauged brick voussoirs, plain reveals, and stone sills. The cellars have shallow 8-pane sashes with wooden lintels.

Notable features include fine Regency ironwork open porches with wooden canopies, stone treads for the steps, and iron handrails. The double doors have later 19th-century sidebar glazing in the upper portions. There is a round-arched tunnel passage to the extreme right of Rosemount. The rear of Bryn Aderyn is largely made of rubblework and has deep boarded eaves. The stair/lobby window has sidebars, and there are sash windows that slide down to the cellar, with one modern unsympathetic window. The west elevation of the rear wing of Rosemount is slate hung.

The entrance gates are flanked by brick piers with inswept walls. The buildings have been converted to offices and feature an early 19th-century staircase. Some partition walls are timber framed and filled with wattle and daub. There is a 17th-century stair leading to the cellar, which has a square newel and flat balusters.

Local climate

Bryn Aderyn sits in a wetter-than-average part of the UK, with an average of 1,010 mm of rain a year. This makes it wetter than 81% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 73% of listed buildings.

It experiences an average of 47 freeze-thaw cycles a year, more than 88% of listed buildings. Of these, 27 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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