21 Y Graig (Sunnyside) is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 1 April 1974. House.
21 Y Graig (Sunnyside)
- WRENN ID
- leaning-column-moon
- 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
- 21 Y Graig (Sunnyside), Tremadog, Porthmadog
- OS grid reference
- SH 559 402
- Coordinates
- 52.94019, -4.14506
- Source
- Cadw listing
Description
21 Y Graig (Sunnyside) is part of a terrace of five two-storey houses located in Tremadog, constructed from local stone. The stonework is roughly coursed and squared for No 9, while the other houses feature random rubble with larger quoins. Each house has stone lintels, a slate roof, and six stone chimney stacks. No 21 is a later addition to the terrace and is single-fronted, with its windows and door on the right, both of 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 marks the separation between Nos 20 and 21. Nos 20, 19, and 10 are also single-fronted with entrances on the right. No 20 is the best preserved of the group, 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 still retain their original openings. No 9 is double-fronted and also has its door and windows replaced in original openings, along with a flat-roof rear wing. This terrace belongs to a group that includes 9-10 and 19-21 Y Graig (Sunnyside).
Local climate
21 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 — 3 transactions since 1997
- 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
Matched applications, energy data and sale records are assembled automatically and may contain errors. Flag incorrect data.
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