Groundworks matter more in Bedworth than in most of the towns we work in, because of what the ground has been used for.
The town sits on a worked coalfield. Twenty pits around here were producing 5.8 million tons a year at the 1939 peak, and the last of them in the Bedworth area, Newdigate, only closed in 1982. Before we design foundations we want a Coal Authority mining report for the address. It is inexpensive, it comes back quickly, and it tells you what is actually known about the ground under the plot. Getting it before a design is settled is straightforward. Getting it after a trench is open is a bad afternoon.
We are not going to tell you your plot is affected. Nobody can say that from the pavement, and any builder who does is guessing with your money. What we will say is that on this ground the check is cheap and skipping it is not a saving.
The ordinary considerations still apply on top. On shrinkable clay a foundation near a mature tree has to go deeper than standard, sometimes considerably. We dig to find bearing rather than to reach a figure on a drawing, and the inspector will want to see the same.
Everything is inspected before it is covered. Our footings and excavation page explains our approach.