Quantity and continuity
Areas below 20 m² or scattered crossing points can add £35–£80/m² through repeated setting out and mobilisation.
Foundation condition
Ground reduction, sub-base replacement and regulating can add £45–£100/m² where a sound prepared foundation is not provided.
Cutting and interfaces
Radii, dropped kerbs, covers and irregular boundaries typically increase the installed rate by 15–35%.
Product specification
Non-standard colours, enhanced-strength units or project-specific profiles can add £15–£55/m².
Access and phasing
Restricted deliveries, pedestrian management or short working windows can increase rates by £20–£60/m².
Bedding system
Proprietary bedding mortar, bonding slurry and specialist jointing can add £15–£35/m² over a conventional mortar-bed installation.