Sarn Helen is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 31 March 1983. House. 5 related planning applications.
Sarn Helen
- WRENN ID
- dusk-keystone-furze
- Grade
- II
- Local Planning Authority
- Gwynedd
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 31 March 1983
- Type
- House
- Address
- Sarn Helen, South Road, Caernarfon, LL55 2HP
- OS grid reference
- SH 482 622
- Coordinates
- 53.13599, -4.26962
- Source
- Cadw listing
Description
Sarn Helen and Bron Eifion are a pair of attached, late Georgian houses, two storeys high and originally three bays wide. They have a hipped slate roof with moulded eaves, and roughcast stacks are located centrally and to the right, with a pebble-dashed stack to the left. A veranda supported by wooden posts and featuring a replaced roof, hipped to the right, extends across the front. Each house has a central fielded-panel door, with glazed panels in the middle and upper sections of Bron Eifion, recessed within a round-headed arch. This arch is framed by thin Tuscan columns with moulded capitals, a blank entablature, and a neo-classical iron fanlight with radial glazing.
The front of the houses is rendered with scribed stucco and features replaced windows in their original openings, including canted bay windows on the left side. The veranda retains a cast iron valance. The attic has a flat-roofed dormer (20th century), a small-pane roof dormer on the left slope, and a long, raked dormer to the rear. The rear elevation also has replaced openings, including a central door, inserted French doors to the left, and a round-headed stair light at the centre.
Inside, the houses retain their original central plan, with principal rooms on the ground floor and a kitchen in the basement. The full-height open-well staircase has a wreathed handrail, plain balusters, and moulded tread ends. The basement includes the original kitchen on the left side, and the pantries retain original slate shelves.
Local climate
Sarn Helen sits in one of the wettest parts of the UK, with an average of 1,370 mm of rain a year. This makes it wetter than 97% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 98% of listed buildings.
It experiences an average of 20 freeze-thaw cycles a year, fewer than 78% of listed buildings. Of these, 9 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 — 10 transactions since 1998
- Related listed building consents — 5 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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