Office and showroom of former Union Ironworks is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 3 May 2002. Office, showroom.

Office and showroom of former Union Ironworks

WRENN ID
dreaming-tracery-nightshade
Grade
II
Local Planning Authority
Gwynedd
Constituency
Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
Country
Wales
Date first listed
3 May 2002
Type
Office, showroom
Address
Office and showroom of former Union Ironworks, Caernarfon
OS grid reference
SH 480 624
Coordinates
53.13758, -4.27279
Source
Cadw listing

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

Description

The former Union Ironworks office and showroom is a Gothic style building dating from the 19th century. It stands two storeys high and features three bays, constructed of yellow brick. The front wall is currently pebble-dashed, and the decorative slate roof includes bands of light-grey slates along with yellow-brick ridge stacks. The left side has gabled rear projections that have a lower eaves line.

The central doorway is framed by plain square jambs with crocket capitals, a moulded shouldered lintel with orbs in the spandrels, and a cornice. It has double panelled doors with an overlight, all set within a recessed segmental-pointed brick arch. Above the entrance, the central bay features a narrow window positioned above the eaves, topped with a gablet that has plain barge boards. The architrave displays crocket capitals leading to a pointed arch, which contains an inner arch with a tall two-pane sash window.

The outer bays have three-light hipped bay windows on the lower storey, supported by detached ringed colonnettes and crocket capitals. These windows were boarded up at the time of inspection. The upper storey features narrower, shallow three-light bay windows that extend above the eaves, also under gablets supported by kneelers and with plain barge boards. The windows consist of two-pane horned sashes framed by square mullions with crocket capitals on the right-hand bay, and ringed colonnettes on the left-hand bay, all under pointed heads with quatrefoils in the tympana. Linked hood moulds with foliage stops are present above the windows.

The gable ends are made of yellow brick with blue-brick banding. The right gable end has two two-pane sashes in the upper storey, set under segmental pointed heads that include blank stone tympana. The left gable end mirrors this but features blocked openings with stone lintels and segmental brick relieving arches on the lower storey. Lean-to structures have been added to the rear of the building.

Local climate

Office and showroom of former Union Ironworks 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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