Quarry Office is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 24 May 2000. Office.
Quarry Office
- WRENN ID
- ruined-tin-falcon
- Grade
- II
- Local Planning Authority
- Gwynedd
- Constituency
- Bangor Aberconwy MP: Claire Hughes (Lab)
- Country
- Wales
- Date first listed
- 24 May 2000
- Type
- Office
- Address
- Quarry Office, Penrhyn Slate Quarry, Bangor, Llandygai
- OS grid reference
- SH 620 653
- Coordinates
- 53.16761, -4.06559
- Source
- Cadw listing
Description
The Quarry Office is a single-storey building designed in a simpler version of the free Italianate style, similar to the Penrhyn Estate office at Porth Penrhyn. It is constructed from regularly coursed and dressed rubblestone blocks, featuring finely jointed voussoirs around the doors and windows, and has a mainly hipped slate roof.
On the main elevation, there is a projecting stepped gable to the left, which frames a round-arched recess containing a tripartite sash window with glazing bars, along with a 4-paned sash window above. To the right, there is an entrance accessed through a segmental-headed 4-panel door. The main section to the right includes two segmental-headed sash windows, with a similar 2-paned sash window in the front wall of a small hip-roofed square projection. The right return of the main section features two similar 6-paned sashes in segmental-headed surrounds, while the back wall has three sash windows, all located to the left of a lean-to porch that connects with a rear projection leading to a large 20th-century extension linked to the original building.
A slate slab ridge stack is positioned at the far right of the main range, with similar stacks located towards the top of its hipped ends. Inside, the building retains slate fireplaces with bracketed surrounds.
Local climate
Quarry Office 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.
- No sale records on file
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- 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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