Gunpowder Magazine is a Grade II listed building in the Isle of Anglesey local planning authority area, Wales. First listed on 25 July 1994. House. 2 related planning applications.

Gunpowder Magazine

WRENN ID
idle-chimney-spring
Grade
II
Local Planning Authority
Isle of Anglesey
Constituency
Ynys Môn MP: Llinos Medi (PC)
Country
Wales
Date first listed
25 July 1994
Type
House
Address
Gunpowder Magazine, Breakwater Quarry, Holyhead
OS grid reference
SH 229 834
Coordinates
53.31789, -4.66007
Source
Cadw listing

Also on this page: related consents · flood risk · radon risk · weather exposure · detailed attributes ↓

Description

The Gunpowder Magazine is a 19th-century building constructed of grey stone. The front (south) side features a porch with a monopitch roof, a doorway with a steel door, and a small window to the right. Each end of the building has three buttresses and a small window in the left wall, while the rear is plain. Inside, there are two chambers separated by thick walls, with brick vaults.

Local climate

Gunpowder Magazine sits in a wetter-than-average part of the UK, with an average of 1,030 mm of rain a year. This makes it wetter than 83% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 93% of listed buildings.

It experiences an average of 8 freeze-thaw cycles a year, fewer than 93% of listed buildings. Of these, 3 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
  • 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
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