Plas Isaf is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 2 August 1988. House. 2 related planning applications.
Plas Isaf
- WRENN ID
- sombre-rampart-laurel
- Grade
- II
- Local Planning Authority
- Gwynedd
- Constituency
- Bangor Aberconwy MP: Claire Hughes (Lab)
- Country
- Wales
- Date first listed
- 2 August 1988
- Type
- House
- Address
- Plas Isaf, 27 Upper Garth Road, Bangor, LL57 2SR
- OS grid reference
- SH 584 730
- Coordinates
- 53.23521, -4.12295
- Source
- Cadw listing
Description
Plas Isaf is a late Georgian two-storey house. The front facade is rendered with deep scored lines to mimic stonework, featuring channelled quoins and a band course running just below the eaves. The roof is slate, with wide bracketed eaves and chimney stacks finished in cement render and pebbledash. The windows are 12-pane sashes, each with a label moulding above the ground-floor openings. A panelled front door is topped by a fanlight recessed within a bracketed hood. A later splayed bay window has been added to the left side, featuring casement glazing. The rear of the house has 2-pane sashes. A three-storey cross wing extends from the right rear and is largely a modern conversion of former outbuildings, incorporating a splayed bay window facing the garden. Inside, the Drawing Room retains a reeded fireplace.
Local climate
Plas Isaf sits in one of the wettest parts of the UK, with an average of 1,210 mm of rain a year. This makes it wetter than 92% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 90% of listed buildings.
It experiences an average of 37 freeze-thaw cycles a year, more than 67% of listed buildings. Of these, 19 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.
- Sale history — 2 transactions since 1997
- 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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