Gelli is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 1 April 1974. Terrace of cottages.
Gelli
- WRENN ID
- silver-transept-spindle
- Grade
- II
- Local Planning Authority
- Gwynedd
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 1 April 1974
- Type
- Terrace of cottages
- Address
- Gelli, 21 Heol Dulyn (Dublin Street), Tremadog, Porthmadog
- OS grid reference
- SH 561 401
- Coordinates
- 52.93934, -4.14255
- Source
- Cadw listing
Description
This is a terrace of 1½-storey cottages located at 9-25 Dublin Street, Tremadog. The cottages are built of roughly coursed and squared quarried stone, with boulder footings to Nos 9 and 11, and have a slate roof and 5 stone stacks. Each cottage has a raked half dormer. No 9 is a two-window house featuring a half-glazed door on the left side. The windows throughout the terrace are replacements, but are set within original openings. Nos 11-25 are single-fronted and arranged in reflected pairs, with mostly 20th-century replacement doors and windows. Some of these windows are enlarged, while others remain in the original openings. No 11 has a small-pane horizontal-sliding sash window within its dormer. A lower doorway is now blocked between Nos 13 and 15. No 25 includes a two-window addition on its right side, topped with a skylight, followed by a single-storey addition called ‘Yr Efail’ which features modern detailing.
The rear of the terrace has been extensively altered and extended with modern detailing. These include a two-storey wing to the rear of No 9, outshuts to the rears of Nos 11 and 13, two-storey wings to the rears of Nos 15 and 17, two-storey flat-roofed extensions to the rears of Nos 19 and 21, an outshut to the rear of No 23, and a two-storey wing to the rear of No 25.
Local climate
Gelli 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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