Engine house is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 21 July 1999. Engine house.
Engine house
- WRENN ID
- secret-loggia-plum
- Grade
- II
- Local Planning Authority
- Gwynedd
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 21 July 1999
- Type
- Engine house
- Address
- Engine house, Garreg Fawr Slate Quarry, Caernarfon, Waunfawr
- OS grid reference
- SH 537 581
- Coordinates
- 53.1001, -4.18522
- Source
- Cadw listing
Description
This is a square-plan engine house built in the form of a castellated tower. It features roughly coursed slate slab construction and originally had a gabled roof that was concealed by a crenellated parapet, although the roof structure is now missing. The entrance is located on the north side and consists of a square-headed doorway with a round-headed opening directly above it. On the east and west sides, there are twin round-headed arches at the ground level, with the western arch now blocked; these arches once housed shafts for winding gear. The upper level has round-headed openings on the east and south sides, with the latter infilled, and twin round-headed openings on the west side, which are also blocked.
Although the building is roofless, wall sockets for joists from the former first floor remain, along with extensive lime render below the former gable line. The south wall features a round-headed fireplace on the first floor and another fireplace on the ground floor, both with massive slate lintels.
Local climate
Engine house sits in one of the wettest parts of the UK, with an average of 1,380 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 25 freeze-thaw cycles a year, fewer than 73% of listed buildings. Of these, 12 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
- 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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