Islwyn (formerly known as Ty Isa) is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 31 January 2001. Manse.
Islwyn (formerly known as Ty Isa)
- WRENN ID
- steep-pinnacle-poplar
- Grade
- II
- Local Planning Authority
- Gwynedd
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 31 January 2001
- Type
- Manse
- Address
- Islwyn (formerly known as Ty Isa), Llandderfel, Bala
- OS grid reference
- SH 981 369
- Coordinates
- 52.92034, -3.51573
- Source
- Cadw listing
Description
Islwyn, formerly known as Ty Isa, is a two-storey late Victorian manse constructed of uncoursed slatestone with red brick quoining around the openings. It features a medium-steep slate roof with brick end chimneys topped with ceramic pots. The building has a symmetrical three-bay facade with a central entrance that includes a modern glazed door and a rectangular glazed overlight above it. There is an inset slate dedication plaque framed in brick above the door, which bears a Welsh inscription with the date 1886 and the name 'Ty Isa, Llandderfel'. The original windows are 4-pane sashes with projecting stone sills. The interior was not inspected during the survey.
Local climate
Islwyn (formerly known as Ty Isa) sits in a wetter-than-average part of the UK, with an average of 1,120 mm of rain a year. This makes it wetter than 88% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 74% of listed buildings.
It experiences an average of 54 freeze-thaw cycles a year, more than 95% of listed buildings. Of these, 34 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 — 3 transactions since 2016
- 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
Matched applications, energy data and sale records are assembled automatically and may contain errors. Flag incorrect data.
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