Tremadog Manufactory is a Grade II* listed building in the Gwynedd local planning authority area, Wales. First listed on 30 March 1951. Manufactory.

Tremadog Manufactory

WRENN ID
leaning-moat-bistre
Grade
II*
Local Planning Authority
Gwynedd
Constituency
Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
Country
Wales
Date first listed
30 March 1951
Type
Manufactory
Address
Tremadog Manufactory, Porthmadog
OS grid reference
SH 563 403
Coordinates
52.94102, -4.13864
Source
Cadw listing

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

Description

Tremadog Manufactory is a five-storey mill built from coursed rubble stone in large quarried blocks, topped with a shallow hipped roof made of corrugated metal and featuring stone end stacks. The openings in the building have wedge lintels and are mostly boarded over, except for the upper left-hand window, which is partially blocked. On the lower storey, there are four doorways and a window at the right end. The right end wall shows the shadow and stub wall of a former gabled projection. The left side wall has two windows on the third, fourth, and fifth storeys, which are similar to those at the front but smaller. The rear of the building is only three storeys high due to a higher ground level. In the central bay, there are double boarded doors beneath a now boarded-up overlight, which has been heightened from its original opening and features a timber lintel. To the left of this are a recessed boarded door with a window and a window in the left end bay. To the right of the centre, there is a window that has been inserted into an original but blocked double doorway, and further to the right is another similar blocked doorway in the right end bay. The building was not accessible at the time of the survey.

Local climate

Tremadog Manufactory 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
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  • Radon risk assessment
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