Garthowen, Marine Terrace is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 26 September 2005. House.
Garthowen, Marine Terrace
- WRENN ID
- young-chapel-kestrel
- Grade
- II
- Local Planning Authority
- Gwynedd
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 26 September 2005
- Type
- House
- Address
- Garthowen, Marine Terrace, 6 Ffordd Garth (Garth Road), Porthmadog
- OS grid reference
- SH 568 382
- Coordinates
- 52.92234, -4.13098
- Source
- Cadw listing
Description
Garthowen, located on Marine Terrace, is a 3-storey, 3-bay house built in the late Georgian style. It features a roughcast front with rusticated quoin strips, set over a slate-stone base, and has a slate roof with projecting eaves. The house is part of a range with No 7 and includes a roughcast stack on the left and a stone stack on the right.
A central porch has been added, which has a flat roof concealed behind a moulded cornice. The porch contains a half-glazed fielded-panel door with small-pane glazing that includes a small diamond light, topped by an Art Nouveau coloured-glass overlight. To the left of the porch is a small-pane window with a circular light, and there are small lights in the side walls.
The windows of the main house are set under hood moulds on the lower two storeys. The lower storey features 12-pane hornless sash windows, while the middle and upper storeys have 16-pane hornless sash windows.
The property has not been inspected.
Local climate
Garthowen, Marine Terrace 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
Matched applications, energy data and sale records are assembled automatically and may contain errors. Flag incorrect data.
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