What groundworks covers
What groundworks actually means
Groundworks is everything that happens between a cleared site and the point where the bricklayers can start. It covers digging out and levelling the ground, putting in the foundations the building sits on, running the drainage and services beneath it, and laying the slabs and bases that carry the floor.
Get it right and nobody ever thinks about it again. Get it wrong and it shows up years later as cracking, settlement or a drain that will not clear, by which point putting it right means digging up what has been built on top.
That is why we would rather look at a job than guess at it. What is under the surface in Benfleet is not what is under the surface on Canvey, and the price of a footing changes with it.