Plasdderwen is a Grade II listed building in the Carmarthenshire local planning authority area, Wales. First listed on 8 March 1966. Terraced house. 1 related planning application.

Plasdderwen

WRENN ID
idle-jade-hawk
Grade
II
Local Planning Authority
Carmarthenshire
Constituency
Caerfyrddin MP: Ann Davies (PC)
Country
Wales
Date first listed
8 March 1966
Type
Terraced house
Address
Plasdderwen, 17 High Street, Llandovery, SA20 0PU
OS grid reference
SN 768 343
Coordinates
51.994, -3.79446
Source
Cadw listing

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

Description

Plasdderwen is a three-bay, three-storey terraced house dating from the 18th century. It has a slate gabled roof and modern brick chimney stacks. The front facade is of painted stucco with long and short quoins, and a stone plinth. There are hornless sash windows throughout; the upper floor has six-pane windows with a painted blank central opening, while the lower floors have twelve-pane windows, the central one being a dummy. The central entrance features a six-panel door with early door furniture, set within a panelled, square-headed recess, which itself is framed by a fine wooden doorcase with a Greek triglyph and mutule entablature on slender, fluted Tuscan columns.

To the left of the main house is a single-bay, two-storey section, with internal access to an adjacent property. This section also has a slate gabled roof and bracketed eaves. The upper floor is painted stucco with a nine-pane hornless sash window. The lower floor has been altered with a 19th-century shop front, consisting of a single-pane window to the left and a door to the right, with an overlight that has been boarded over. This shop front incorporates thin, later 19th-century column shafts and spandrel brackets and has a fascia covered by 20th-century boarding.

The interior is not accessible, but is reportedly original, featuring a staircase, cornices and arched recesses. Dividing walls are present behind the upper central windows. The downstairs front rooms are said to contain arched recesses flanking fireplaces, although the original 18th-century chimney pieces are no longer present. The staircase behind the left front room is said to be of oak.

Local climate

Plasdderwen sits in one of the wettest parts of the UK, with an average of 1,390 mm of rain a year. This makes it wetter than 97% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 91% of listed buildings.

It experiences an average of 43 freeze-thaw cycles a year, more than 84% of listed buildings. Of these, 23 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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  • Full EPC report — heating system, energy costs, size, glazing, construction etc.
  • Sale history — 6 transactions since 2000
  • 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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