In the United Kingdom, the term listed building refers to a building or other structure officially designated as being of special architectural, historical, or cultural significance; Grade I structures are those considered to be "buildings of exceptional interest". Listing was begun by a provision in the Town and Country Planning Act 1947. Once listed, strict limitations are imposed on the modifications allowed to a building's structure or fittings. In Wales, the authority for listing under the Planning (Listed Buildings and Conservation Areas) Act 1990 rests with Cadw.
|Name||Location||Date Listed||Grid Ref.[note 1]
|Function||Notes||HB No[note 2]||Image|
|Caerphilly Castle||Caerphilly||28 January 1963||Castle||On a low-lying marshy site surrounded by hills to the N, S and W. Two streams, the Nant Gledyr and Nant yr Aber, cross the area and drain into the R Rhymney which flows towards the E. These streams were dammed to make the moat and great lakes.||13539|
|Llancaiach Fawr||Gelligaer||25 October 1951||House||Close to the W community boundary which follows Nant Caeach, a short distance NE of Nelson and reached by a short track from the main road. Fronts a re-created formal garden, the surrounding walls incorporating stone benches.||13562|
Media related to Grade I listed buildings in Caerphilly County Borough at Wikimedia Commons