Bwthyn Marda is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 1 April 1974. House.

Bwthyn Marda

WRENN ID
dark-vestry-willow
Grade
II
Local Planning Authority
Gwynedd
Constituency
Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
Country
Wales
Date first listed
1 April 1974
Type
House
Address
Bwthyn Marda, 2 Heol Dulyn (Dublin Street), Tremadog, Porthmadog
OS grid reference
SH 561 401
Coordinates
52.93971, -4.1424
Source
Cadw listing

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

Description

Bwthyn Marda comprises a reflected but unequal pair of two-storey, two-window houses built of blocks of quarried stone laid in regular courses. The buildings have a slate roof and roughcast end stacks. The house on the right-hand side is wider than its counterpart. The openings are framed by flat stone arches. The doorways, located on the inner sides, feature half-lit doors with vertical panels and small-pane glazing. The ground-floor windows are 16-pane hornless sashes. The upper-floor windows are 12-pane hornless sashes; the outer windows are set beneath individual gables, while the narrower, inner windows, not aligned with the doorways below, are grouped under a single gable.

To the left is a projecting gabled bay, originally intended as the central element of the design, incorporating a round pitching eye to the loft space. This projecting bay is largely concealed by a modern, 5-bay, 1-storey rendered garage front. Only the original left-hand gable end of what were formerly stables remains visible.

A modern flat canopy is attached to the right gable end, linking to the Royal Madoc Arms Hotel. The rear of the property is predominantly rendered and painted white, and includes a two-storey wing. This wing’s side walls have a boarded door and a small-pane sash window in the upper storey. The rear of the main range also features small-pane sashes on each floor. A further projecting rear wing of former stables is located to the right, constructed of rubble stone, with a largely destroyed roof. This property belongs to a group including 1-2 Dublin Street, Tremadog.

Local climate

Bwthyn Marda 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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Nearby listed buildings

  1. 1 Heol Dulyn (Dublin Street) Grade II 5 m
  2. Royal Madoc Arms Hotel Grade II 28 m
  3. 11 Heol Dulyn (Dublin Street) Grade II 34 m
  4. 9 Heol Dulyn (Dublin Street) Grade II 34 m
  5. Heddfa Grade II 35 m
  6. 15 Heol Dulyn (Dublin Street) Grade II 36 m
  7. 17 Heol Dulyn (Dublin Street) Grade II 38 m
  8. Awelon Grade II 38 m
  9. 19 Heol Dulyn (Dublin Street) Grade II 41 m
  10. Gelli Grade II 42 m