20 Y Graig (Sunnyside) is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 1 April 1974. House.

20 Y Graig (Sunnyside)

WRENN ID
roaming-cobble-bistre
Grade
II
Local Planning Authority
Gwynedd
Constituency
Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
Country
Wales
Date first listed
1 April 1974
Type
House
Address
20 Y Graig (Sunnyside), Tremadog, Porthmadog
OS grid reference
SH 559 402
Coordinates
52.94016, -4.145
Source
Cadw listing

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

Description

20 Y Graig (Sunnyside) is part of a terrace of five two-storey houses located in Tremadog, constructed from local stone. The stone is roughly coursed and squared for No 9, while the other houses feature random rubble with larger quoins. The terrace has stone lintels, a slate roof, and six stone stacks. No 21 is a later addition to the row, single-fronted with its windows and door on the right, which have been replaced in their original openings. The left gable end of No 21 is painted black, and there is a lean-to at the back. A vertical joint separates Nos 20 and 21. Nos 20, 19, and 10 are also single-fronted with entrances on the right. No 20 is the best preserved, featuring a boarded door with an overlight and four-pane hornless sash windows. Nos 19 and 9 have had their doors and windows replaced in the late 20th century, but they remain in their original openings. No 9 is double-fronted, with its door and windows also replaced in original openings, and it includes a flat-roof rear wing. This group of houses includes 9-10 and 19-21 Y Graig (Sunnyside).

Local climate

20 Y Graig (Sunnyside) sits in one of the wettest parts of the UK, with an average of 1,490 mm of rain a year. This makes it wetter than 98% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 97% of listed buildings.

It experiences an average of 32 freeze-thaw cycles a year, fewer than 60% of listed buildings. Of these, 15 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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  • No EPC on record for this property
  • Sale history — 1 transaction since 1995
  • 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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Nearby listed buildings

  1. 19 Y Graig (Sunnyside) Grade II 4 m
  2. 21 Y Graig (Sunnyside) Grade II 5 m
  3. 10 Y Graig (Sunnyside) Grade II 8 m
  4. 9 Y Graig (Sunnyside) Grade II 13 m
  5. 8 Y Graig (Sunnyside) Grade II 28 m
  6. 7 Y Graig (Sunnyside) Grade II 34 m
  7. 6 Y Graig (Sunnyside) Grade II 43 m
  8. 5 Y Graig (Sunnyside) Grade II 71 m
  9. 4 Y Graig (Sunnyside) Grade II 79 m
  10. Cynfal Grade II 89 m