Trem-y-mor, with associated garden walls and walled path is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 18 May 1999. Terrace of houses.
Trem-y-mor, with associated garden walls and walled path
- WRENN ID
- solitary-lancet-fen
- Grade
- II
- Local Planning Authority
- Gwynedd
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 18 May 1999
- Type
- Terrace of houses
- Address
- Trem-y-mor, with associated garden walls and walled path, Nant Gwrtheyrn, Pwllheli, Pistyll
- OS grid reference
- SH 350 448
- Coordinates
- 52.97554, -4.45857
- Source
- Cadw listing
Description
Trem-y-mor is a terrace of 12 houses built in rubble stonework with slate roofs, arranged to follow the rise of the ground. At the southern end, there is a former shop and bakery, which now serves as the shop and offices of the Language Centre. The houses are two storeys high and are arranged in bilaterally symmetrical pairs, with each house consisting of one bay that includes a front parlour and a rear dining room and kitchen. Stairs rise from the front room to two bedrooms. Doors and windows were renewed after 1978, featuring framed and battened doors with overlights, and 12-pane sash windows with stone sills and lintels. Stone stacks are present on the party walls, and each house has a small front garden raised behind a stone retaining wall.
The administrative building, formerly known as Bay View, is positioned higher and features an end bay that forms a cross wing, visually terminating the terrace. It has a steep pitched roof that is gabled at the front. The front of the building has large windows, and the southern side elevation includes five bays with similar 16-pane and 12-pane windows on both levels. The houses are now named, some after sponsors, from north to south: (admin), Arfon, (no name), Ty chwareon, Llandaf, Cwrlwys, Caerffili, Nant-y-ffynnon, Glyn Rhosyn, Ty Ynys Mon, Meirionydd, Maldwyn, and (no name).
The interiors of both the houses and the administrative building were completely modernised in 1987.
Local climate
Trem-y-mor, with associated garden walls and walled path sits in one of the wettest parts of the UK, with an average of 1,710 mm of rain a year. This makes it wetter than 99% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 99% of listed buildings.
It experiences an average of 7 freeze-thaw cycles a year, fewer than 95% of listed buildings. Of these, 2 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.
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- No EPC on record for this property
- No sale records on file
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- 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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