18 Merthyr Road is a Grade II listed building in the Cardiff local planning authority area, Wales. First listed on 6 October 1977. Terrace. 1 related planning application.

18 Merthyr Road

WRENN ID
tenth-tin-ebony
Grade
II
Local Planning Authority
Cardiff
Constituency
Cardiff North MP: Anna McMorrin (Lab)
Country
Wales
Date first listed
6 October 1977
Type
Terrace
Address
18 Merthyr Road, Tongwynlais
OS grid reference
ST 132 822
Coordinates
51.53253, -3.25268
Source
Cadw listing

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

Description

This is a two-storey terrace of ten cottages, numbered 4 to 22, built in the 18th century and opening directly onto the pavement. The cottages are constructed of narrow coursed rubble with stone voussoirs around the window and door openings, regular dressed stone quoins, and the side elevations are rendered. They have a Welsh slate roof with narrow red brick ridge stacks, each featuring three pots. With the exception of number 14, the central left unit, each cottage has a single window range and a front door. Number 14 has a three-window range and a central front door, indicating the presence of a central staircase within.

Originally, the cottages had small-pane sash windows, which have been largely replaced with two-light casements on the first floor and transomed casements on the ground floor. Some of the new windows have rendered surrounds, while others have slightly cambered heads, and all windows have replacement doors. A low masonry revetment slopes down to the right of the terrace.

Originally, the staircases rose beside the fireplace in the front room of each cottage, with the exception of the main staircase in number 14. Some original stone flagged floors and slabs remain from the former pantries. The ground floor ceilings are supported by thin joists, and some of these are exposed.

Local climate

18 Merthyr Road sits in a wetter-than-average part of the UK, with an average of 1,110 mm of rain a year. This makes it wetter than 88% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 90% of listed buildings.

It experiences an average of 21 freeze-thaw cycles a year, fewer than 78% 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 — 1 transaction since 2025
  • 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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Nearby listed buildings

  1. 20 Merthyr Road Grade II 4 m
  2. 16 Merthyr Road Grade II 5 m
  3. 22 Merthyr Road Grade II 8 m
  4. 14 Merthyr Road Grade II 11 m
  5. 12 Merthyr Road Grade II 17 m
  6. 10 Merthyr Road Grade II 22 m
  7. 8 Merthyr Road Grade II 27 m
  8. 6 Merthyr Road Grade II 31 m
  9. 4 Merthyr Road Grade II 35 m
  10. Church of St Michael and All Angels Grade II 149 m