'B'
| Baluster | - | Alternative term for Banister |
| Barge Board | - | Wide board fitted on edge of tiles following the slope of the roof |
| Bead | - | Small convex moulding |
| Bib Tap | - | Tap fed by horizontal supply - as in a garden tap |
| Blown or Live | - | Plaster that has lost its bond with the wall |
| Bond | - | Arrangement of bricks to ensure stability of brickwork |
| Buttress or Pier | - | Thickening of wall to form a vertical projection to strengthen it |