Blackweir Farmhouse is a Grade II listed building in the Cardiff local planning authority area, Wales. First listed on 19 May 1975. House.

Blackweir Farmhouse

WRENN ID
hollow-terrace-ivory
Grade
II
Local Planning Authority
Cardiff
Constituency
Cardiff South and Penarth MP: Stephen Doughty (Lab)
Country
Wales
Date first listed
19 May 1975
Type
House
Address
Blackweir Farmhouse, Castle
OS grid reference
ST 175 775
Coordinates
51.49096, -3.18871
Source
Cadw listing

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

Description

Blackweir Farmhouse is a two-storey farmhouse featuring Gothic details. The walls are faced with brown rubble stone and have ashlar banding, topped with a slate roof and red brick chimneys. The north front has two window bays and a central doorway. On the first floor, there are two gabled dormers with decorative bargeboards and 2-light casements. The ground floor includes a transomed and mullioned window on either side of the central gabled porch, which has a bargeboard and a 4-centred doorway. To the right, there is a single-storey lean-to. The side elevation showcases the gabled end of the front block with decorative bargeboards, a 2-light casement window on the first floor, and a 3-light mullion and transom window on the ground floor. To the right in the rear wing, there is a gabled dormer with decorative bargeboards and a 2-light casement, along with a mullion and transom window on the ground floor. In the angle between the blocks, there is a single-storey porch featuring a Gothic window and a Gothic doorway to the side.

Local climate

Blackweir Farmhouse sits in a wetter-than-average part of the UK, with an average of 1,080 mm of rain a year. This makes it wetter than 86% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 87% of listed buildings.

It experiences an average of 22 freeze-thaw cycles a year, fewer than 77% of listed buildings. Of these, 8 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 — 2 transactions since 2003
  • No related consent applications matched
  • 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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