Ty Mawr is a Grade II* listed building in the Snowdonia National Park local planning authority area, Wales. First listed on 13 October 1966. House. 1 related planning application.
Ty Mawr
- WRENN ID
- slow-belfry-weasel
- Grade
- II*
- Local Planning Authority
- Snowdonia National Park
- Constituency
- Bangor Aberconwy MP: Claire Hughes (Lab)
- Country
- Wales
- Date first listed
- 13 October 1966
- Type
- House
- Address
- Ty Mawr, Wybrnant, Bro Machno, Conwy, LL25 0HJ
- OS grid reference
- SH 770 524
- Coordinates
- 53.05475, -3.8366
- Source
- Cadw listing
Description
Ty Mawr is a two-storey house built with flat stone slabs and has massive foundations. The roof is made of random slate in graded courses, which dates from restoration work done in 1987-88. It features end chimneys made of stone, capped by slabs, which discharge smoke to the sides. The southern chimney is massive and has been heightened with smaller masonry blocks, while the northern chimney is less massive and leans noticeably to the south, with its chimney breast corbelled out about 1.8 metres above ground level.
On the upper floor, there are two almost square windows and a smaller window to the left. A slate plaque between the floors records the history of the house, dating from the 1980s restorations. The entrance doorway, restored to its current position in the 1980s, has stone lintels and jambs. To the left of the entrance, there is one rectangular window and one small square window; to the right, there is a small square window. At the rear, the upper floor has two horizontally-proportioned windows, with the one on the right being deeper. On the ground floor, there is a square-headed door, and to the right, a small vertically-proportioned window.
The interior arrangements were restored in 1987-88 and feature a stone flagged floor. The entrance passage has modern post-and-panel partitions, with two rooms to the right and a modern oak partition between them. To the left of the passage is a hall with chamfered ceiling beams. There is a large fireplace in the southern end wall, with a heavy chimney lintel that shows mortices indicating a former loft. The south wall has the base of a former cruck. A modern wooden stair leads to the first floor, which is partitioned into two modern rooms. The chamber over the hall has two deep cupboards flanking the chimney, and there is a book room with a fireplace. The roof consists of three collar-beam trusses with purlins and two tiers of purlins, which were formerly trenched.
Local climate
Ty Mawr sits in one of the wettest parts of the UK, with an average of 1,200 mm of rain a year. This makes it wetter than 91% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 84% of listed buildings.
It experiences an average of 45 freeze-thaw cycles a year, more than 86% of listed buildings. Of these, 27 follow at least 1 mm of rain in the preceding 48 hours. Average temperatures at this location have risen by 0.2°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
- No sale records on file
- Related listed building consents — 1 application
- 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
Matched applications, energy data and sale records are assembled automatically and may contain errors. Flag incorrect data.
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