Wenallt, Marine Terrace is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 26 September 2005. House.

Wenallt, Marine Terrace

WRENN ID
sleeping-ember-sable
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
Wenallt, Marine Terrace, 4 Ffordd Garth (Garth Road), Porthmadog
OS grid reference
SH 568 382
Coordinates
52.92251, -4.131
Source
Cadw listing

Also on this page: flood risk · radon risk · weather exposure · detailed attributes ↓

Description

Wenallt is a 2-storey house with a 3-window front, located on Marine Terrace. It features a roughcast exterior, a renewed slate roof, and shared roughcast end stacks. The openings are slightly offset to the left side and have hood moulds. The central entrance is above street level and accessed by steps, featuring a half-glazed panel door with an overlight. The windows are 4-pane horned sashes, with the upper storey windows being shorter.

Local climate

Wenallt, 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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  • 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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