| Parapet | - | Low wall at the edge of a roof |
| Party Structure (Party Wall, Party Chimney Stack, Party Parapet etc) | - | Any such structure which is built on the line of junction of two properties and where ownership is shared between the two adjoining property owners |
| Pebble Dash | - | Roughcast wall finish with stones bedded in rendered wall |
| Pilaster | - | Projecting part of a square column which is attached to wall |
| Pitch | - | Slope of roof - expressed as an angle or ratio |
| Plain tile | - | Rectangular "flat" roofing tile |
| Plaster | - | Applied wall finish |
| Plasterboard | - | Prefabricated sheets of plaster for walls and ceilings |
| Plinth | - | Projecting base to external walls |
| Purlin | - | Horizontal beam, part way up a rafter to prevent sagging |