Brick specification
Class B engineering bricks typically add £25–50/m², while Class A units can add £70–125/m² against standard common brickwork.
Wall thickness
Increasing from 102.5 mm to 215 mm solid construction generally raises the rate by 90–110%.
Mortar requirement
Enhanced sulfate resistance, stronger mixes or proprietary mortar can add £5–12/m².
Trench access
Deep, narrow or supported excavations commonly increase placing costs by 10–30% through slower handling and reduced gang productivity.
Geometry
Frequent corners, steps, piers and short returns can increase the installed rate by 15–40%.
Package size
Small or highly fragmented quantities may attract a 10–25% uplift for mobilisation, supervision and lost continuity.