Ty Mawr is a Grade II listed building in the Snowdonia National Park local planning authority area, Wales. First listed on 26 May 1995. House. 2 related planning applications.
Ty Mawr
- WRENN ID
- sharp-pedestal-russet
- Grade
- II
- Local Planning Authority
- Snowdonia National Park
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 26 May 1995
- Type
- House
- Address
- Ty Mawr, Rhydymain, Brithdir and Llanfachreth, Gwynedd, LL40 2BP
- OS grid reference
- SH 807 226
- Coordinates
- 52.78836, -3.76914
- Source
- Cadw listing
Description
Ty Mawr is a building constructed of rubble, standing one-and-a-half stories tall and topped with a modern slate roof. It features stone-coped and kneelered gable parapets, along with end chimneys that have weather-coursing and capping. The entrance is flanked by irregular windows for each unit, but there are inappropriate modern doors and glazing throughout. The roof has four irregularly spaced gabled dormers, with two for each unit, also fitted with modern glazing. At the rear, there is a central gabled extension that represents a mid to third-quarter 19th-century remodelling of an earlier lean-to addition. Additional modern windows have been inserted into original openings, and there is a small lean-to known as Ty bach on the right side.
Inside, both units have large fireplaces at their gable ends. The fireplace on the right features an ogee-stopped chamfered bressummer and a pegged oak frame that once held a shelved salt-box recess on the left, where a child's boot and some animal bones were recently discovered when it was reopened. The opposite fireplace has cruder run-off stops. The upper ceilings in the right unit have ogee-stopped ceiling joists and beams, while the left unit mostly retains original run-off stopped beams. A modern part-open wall and screen now divide the unit spaces, and an ex-situ door-head section with the carved date 1666 belonged to a recently destroyed screen. The upper floor has a six-bay roof with original oak boarded screens separating bays three and four, and part of four and five. The truss between bays five and six has been replaced, but the remaining trusses are original upper-cruck trusses with pegged collars.
Local climate
Ty Mawr sits in one of the wettest parts of the UK, with an average of 1,310 mm of rain a year. This makes it wetter than 95% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 91% of listed buildings.
It experiences an average of 45 freeze-thaw cycles a year, more than 86% 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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- Full EPC report — heating system, energy costs, size, glazing, construction etc.
- No sale records on file
- Related listed building consents — 2 applications
- 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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