Block specification
Higher strengths, specialist densities or certified performance requirements typically add £10–£25/m².
Block format
Purpose-made wide hollow units can reduce laying effort by £10–£20/m² compared with standard blocks laid flat, subject to lifting constraints.
Openings and returns
Frequent jambs, corners, piers and short panels commonly increase the rate by 15–35%.
Working height
Scaffold lifts, loading platforms and additional vertical distribution can add £15–£30/m² above straightforward low-level work.
Mortar and joints
Coloured mortar, specialist mixes or tooled exposed joints generally add £5–£15/m².
Quantity and phasing
Small, intermittent or multi-visit packages can attract a 20–40% premium through lost productivity and repeated mobilisation.