12 Segontium Terrace, including forecourt railings is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 31 March 1983. House.
12 Segontium Terrace, including forecourt railings
- WRENN ID
- hollow-ashlar-frost
- 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
- 12 Segontium Terrace, including forecourt railings, Caernarfon
- OS grid reference
- SH 480 625
- Coordinates
- 53.1386, -4.27353
- Source
- Cadw listing
Description
12 Segontium Terrace is part of a late Georgian terrace consisting of nine three-storey, two-bay houses, featuring slate roofs and brick or roughcast stacks on the right side. The entrances are located in the left-hand bay and are accessed by steps. In front of the houses, there are original iron railings on dwarf walls, adorned with pointed finials and cone finials on the stanchions, although the gates have been replaced.
Houses numbered 15 to 19 have a larger footprint than those numbered 11 to 14 and project forward at the rear. They also preserve original architraves on the front elevation, while houses 11 to 14 display late 19th-century details. The late 19th-century rendered front features eared and lugged architraves, along with sill bands in smooth render. The doorway is set within an added gabled half-lit porch and includes a replaced half-lit panelled door. The windows are primarily four-pane sashes, except for the upper left window, which is blind.
This terrace is part of the group of buildings at 11-19 Segontium Terrace.
Local climate
12 Segontium Terrace, including forecourt railings 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.
- No sale records on file
- 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
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