Harbour Office is a Grade II* listed building in the Isle of Anglesey local planning authority area, Wales. First listed on 11 March 1993. Office.
Harbour Office
- WRENN ID
- muffled-belfry-evening
- Grade
- II*
- Local Planning Authority
- Isle of Anglesey
- Constituency
- Ynys Môn MP: Llinos Medi (PC)
- Country
- Wales
- Date first listed
- 11 March 1993
- Type
- Office
- Address
- Harbour Office, Salt Island, Holyhead
- OS grid reference
- SH 252 829
- Coordinates
- 53.31455, -4.62499
- Source
- Cadw listing
Description
The Harbour Office is a Georgian building, similar in design to the Customs House, and dates from the 18th century. It is two storeys high and constructed from local Mona marble stone, topped with a hipped slate roof. The front features a broad three-bay layout framed by prominent pilasters, a sill band, a plinth, and a shaped cornice with a blocking course above. A large square clock tower dominates the design, which includes a substantial octagonal belfry adorned with pilasters and a swept cap topped with a ball finial. The clock face is located on the front, with roundels on the other sides; the left roundel has small-pane glazing and all have moulded surrounds, except for the rear. The building has horned small-pane sash windows and a central entrance. To the left, there is a pebbledash fronted lean-to. The rear is blank and has undergone alterations, with a hipped roof cross range.
Local climate
Harbour Office 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
- 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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Nearby listed buildings
- Customs House
- George IV Arch
- Admirlaty Pier (including Sea Wall between Salt Island Bridgea and George IV Arch)
- Lighthouse on Admiralty Pier
- South Pier
- Store, Old Boiler Shop & Sawmill buildings at Marine Yard
- Office and Stores Building
- Fitting, Boiler and Smithy Shops
- Lower Churchyard Walls and Gateway
- St Cybi's Church