Hen Swyddfa'r Porthladd (Old Port Office) is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 24 May 2000. A N/A Small building.

Hen Swyddfa'r Porthladd (Old Port Office)

WRENN ID
distant-brass-torch
Grade
II
Local Planning Authority
Gwynedd
Constituency
Bangor Aberconwy MP: Claire Hughes (Lab)
Country
Wales
Date first listed
24 May 2000
Type
Small building
Period
N/A
Address
Hen Swyddfa'r Porthladd (Old Port Office), Porth Penrhyn, Llandygai
OS grid reference
SH 592 725
Coordinates
53.2317, -4.11066
Source
Cadw listing

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

Description

Hen Swyddfa'r Porthladd, also known as the Old Port Office, is a small single-storey building constructed of rendered rubblestone or brick. It features a hipped slate roof with deep eaves and a pedimented section on the west side. The east wall has a boarded door on the left and an infilled window on the right. The north wall includes a multi-paned tripartite sash window, while the south and west walls are blank, except for a plain cornice beneath the pediment on the west wall. The interior was not accessible during the survey.

Local climate

Hen Swyddfa'r Porthladd (Old Port Office) sits in one of the wettest parts of the UK, with an average of 1,210 mm of rain a year. This makes it wetter than 92% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 90% of listed buildings.

It experiences an average of 37 freeze-thaw cycles a year, more than 67% of listed buildings. Of these, 19 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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  • 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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  5. Penybryn Bridge, including railings & lamp standards Grade II 67 m
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