Loading class
Moving from B125 to D400 typically adds £150–£250 each, while E600 duty can add a further £200–£350 each.
Recessed finish
A recessed tray and coordinated paving infill generally increase the rate by £75–£175 each.
Level adjustment
Engineering-brick, precast or proprietary raising pieces can add £80–£250 each depending on the depth corrected.
Access restrictions
Confined working areas, manual handling and short installation runs can increase labour and plant cost by 15–30%.
Replacement work
Breaking out an existing frame, removing arisings and reinstating the surround commonly adds £200–£450 each.
Special features
Locking, sealing, assisted-lift or anti-theft requirements typically add £100–£300 each to the standard D400 rate.