Groundworks decide whether everything after them runs to programme, and in Daventry there are three things we look at before quoting.
Trees come first. On shrinkable clay a foundation near a mature tree has to go deeper than the standard depth, sometimes considerably deeper, and occasionally the answer is a different foundation altogether. On the estates this catches people out more than it should, because the trees planted when the estate went up in the 1960s and 1970s are now fifty years old and very much large enough to matter. This is the single most common reason a groundworks price moves between quotation and dig, so we establish it with a trial hole rather than assume it.
Ground history is the second. Estate development means made up levels: ground that was cut and filled when the site was laid out, which is not always the ground you would choose to found on. We dig to find bearing rather than to reach a figure on a drawing, and the building inspector will want to see the same.
Access is the third, and here Daventry is usually kind. Most estate plots will take a machine, which keeps the cost down. In the older core and behind the village cottages it can become a hand dig, which is several times the labour for the same hole and belongs in the price from the start.
Everything is inspected before it is covered. Our footings and excavation page explains our approach.