Sub-base provision
Excavation, disposal and a new compacted granular sub-base typically add £30–£60/m².
Slab reinforcement
Mesh reinforcement, chairs and additional handling generally add £12–£25/m².
Aggregate selection
Premium colours, tightly graded pebbles or imported stone can increase the rate by £15–£45/m².
Area and geometry
Small pours, curves, narrow strips and frequent stopping points commonly attract a 15–35% uplift.
Concrete access
Pumping, long barrow routes or timed deliveries can add £10–£30/m² depending on pour size.
Weather protection
Hot, cold or wet-weather controls and return visits for washing can increase costs by 5–15%.