| Dado Rail | - | Horizontal moulding part way up a wall |
| Damp Proof Course | - | A horizontal layer of impervious material laid in a wall to exclude water usually at 6" (15 cm) above ground level. A damp proof course subsequently installed in an older property will usually take the form of a series of chemical injections into the brickwork |
| Damp Proof Membrane | - | An impervious layer under a concrete floor or similar designed to exclude water |
| Deal | - | Term for piece of square-sawn softwood |
| Distemper | - | Wall paint made from water, pigment and glue (traditional) |
| Drip | - | Moulding or groove in overhanging member to prevent water creeping back |