Siop y Plas is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 3 May 2002. Shop, house. 2 related planning applications.
Siop y Plas
- WRENN ID
- calm-joist-weasel
- Grade
- II
- Local Planning Authority
- Gwynedd
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 3 May 2002
- Type
- Shop, house
- Address
- Siop y Plas, 21 Palace Street, Walled Town, Caernarfon, LL55 1RR
- OS grid reference
- SH 478 627
- Coordinates
- 53.13985, -4.27594
- Source
- Cadw listing
Description
Siop y Plas is a three-storey shop and house built in the 19th century. The exterior features scribed stucco with stressed quoins and a graded slate roof that includes a covered skylight and a roughcast stack on the left side. The lower storey has a 19th-century shop front framed by boarded pilasters, with a replaced wooden fascia that retains earlier gabled end brackets and a cornice. To the right is a replaced door with an overlight. The shop window consists of plate glass beneath a clerestorey of lying panes, and there is a boarded stall riser below. The middle and upper storeys are adorned with tripartite windows that have 2-pane sashes set within Greek Revival architraves, with a pediment above the first-floor window.
Local climate
Siop y Plas 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
- 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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