Heddfa is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 1 April 1974. Cottage.
Heddfa
- WRENN ID
- floating-lime-spring
- Grade
- II
- Local Planning Authority
- Gwynedd
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 1 April 1974
- Type
- Cottage
- Address
- Heddfa, 13 Heol Dulyn (Dublin Street), Tremadog, Porthmadog
- OS grid reference
- SH 561 401
- Coordinates
- 52.93939, -4.14233
- Source
- Cadw listing
Description
Heddfa is a terrace of 1½-storey cottages located at 9-25 Dublin Street, Tremadog. Built in the 18th century, they are constructed of roughly coursed and squared quarried stone, with boulder footings to Nos 9 and 11. The roofs are slate, and there are five stone stacks. Each cottage has a raked half dormer. No 9 is a 2-window house with a half-glazed door to the left. The windows are replacements, but are set within original openings. Nos 11-25 are single-fronted, arranged in reflected pairs, and mostly feature 20th-century replacement doors and windows, some of which have been enlarged, while others remain in original openings. No 11 features a small-pane horizontal-sliding sash window in its dormer. A blocked lower doorway is situated between Nos 13 and 15. No 25 has a 2-window addition to the right, topped with a skylight, and incorporates a single-storey addition named Yr Efail which features modern detailing.
The rear of the terrace has undergone extensive alterations and additions incorporating modern details. Specifically, No 9 has a 2-storey wing, Nos 11 and 13 feature outshuts, Nos 15 and 17 have 2-storey wings, Nos 19 and 21 have 2-storey, flat-roofed extensions, No 23 has an outshut, and No 25 has a 2-storey wing. The terrace forms a group with the buildings at 9-25 Dublin Street.
Local climate
Heddfa 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
- No sale records on file
- 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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