Merion House is a Grade II listed building in the Snowdonia National Park local planning authority area, Wales. First listed on 4 November 1999. Workers cottage terrace.
Merion House
- WRENN ID
- high-panel-thyme
- Grade
- II
- Local Planning Authority
- Snowdonia National Park
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 4 November 1999
- Type
- Workers cottage terrace
- Address
- Merion House, 6 Mawddwy Terrace, Minllyn, Dinas Mawddwy, Mawddwy, Gwynedd
- OS grid reference
- SH 859 142
- Coordinates
- 52.7134, -3.69042
- Source
- Cadw listing
Description
The terrace of six worker’s cottages, known as Merion House, was constructed in the 18th century in a mountain-Gothic style. The buildings are built with selected local slate laid on bed and have slate roofs. Two cottages, arranged bilaterally symmetrically, form a prominent gable at each end of the terrace, projecting slightly to dominate the central cottages. Each cottage features a four-paned half-glazed door with a plain overlight, and four-paned horned sash windows to both floors. These windows are set within triangular heads constructed of shale voussoirs. The upper floor windows in the central cottages are contained within five large, raised, and gabled dormers. Deep eaves are present throughout, supported by extended purlins and a ridge with shaped ends. Stone stacks are positioned on the party walls, featuring a necking string and projecting heads. The large gable ends incorporate decorative timber framing to the upper half. It is reported that the original internal partitions were constructed of slate slabs set on end, a design innovation attributed to the landowner, Buckley, and his architect, James Stephens. Merion House occupies the entire southern gable. The north side now has a three-panelled door and a four-light shop window beneath a continuous lintel, which was inserted into the south half of the gable. The south return end of the terrace retains an original sash window, and a raised dormer is situated above it. The terrace belongs to a group of Nos 1-6 Mawddwy Terrace.
Local climate
Merion House sits in one of the wettest parts of the UK, with an average of 1,240 mm of rain a year. This makes it wetter than 93% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 87% of listed buildings.
It experiences an average of 47 freeze-thaw cycles a year, more than 88% of listed buildings. Of these, 26 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
- Sale history — 2 transactions since 2000
- 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
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