Coal cellars are a common feature of Georgian and Victorian era houses. They were built with a brick vaulted roof under the footpath and accessible via the servants’ hall in the basement of the house and some cellars extended out well under the street. Coal holes were installed so coal (and turf {peat} and wood) deliveries could be poured or shovelled into the cellar from the street. The holes are between twelve to fourteen inches in diameter, small enough to keep all but the smallest of burglars out, and are generally circular so the lids can’t fall through the hole. The cover sits into an iron rim set in the pavement and is locked with a chain attached to an eye inside the lid and is fastened from beneath.

Coal hole and doorway under the street on Mountjoy Square, Dublin.
The majority of Dublin’s cast iron coal hole covers were made between 1760 and 1830 in foundries such as Tonge & Taggart on Windmill Lane, South City Foundry on Bishop Street, Sharke’s on Church Street, Hammond Lane and T. Saul & Co on Leeson Street Upper – all long gone. The covers were cast with lines and/or patterns to stop people slipping on them in the rain and often included the name of the foundry. The casting involved a wooden or metal master cover being forced into a box of sand. The master was removed, producing a mould into which the molten iron was poured.

An ornate coal hole cover from Mountjoy Square, Dublin, Ireland, still set in its original granite.