PPS 6 Planning Archaeology and the Built Heritage·Page 13·2.16
Scope of Listed Building Categories
Listed buildings include all types of structures from grand mansions to vernacular architecture, and may include man-made objects not normally considered buildings such as war memorials, bridges, and industrial structures.
The list of buildings of special architectural or historic interest records the best of our architectural heritage. It includes every type of building, ranging from grand mansions and cathedrals to warehouses and vernacular architecture. As well as conventional buildings, the list may include man made objects or structures not normally considered as buildings, for example tombstones, telephone kiosks, post boxes, gates, war memorials, bridges, docks and other industrial structures.
Source — /Users/richardhill/Documents/planning-arch-project/data/documents/regional/PPS 6 - Planning Archaeology and the Built Heritage.pdf