Groundworks in central Leamington are dominated by one thing: you are usually digging next to something old, shallow and not designed for a neighbour.
Spa era buildings often have basements, and the walls retaining them were built with very little in the way of foundations by modern standards. Excavating alongside one is a job for care, sequencing and sometimes temporary support, not for taking out the full length in a morning because the machine is on hire. Where the wall is shared with the property next door this is party wall territory and it needs proper notice.
The ordinary considerations sit on top of that. On shrinkable clay a foundation near a mature tree goes deeper than standard, and Leamington has a great many mature trees, a good proportion of them protected by a conservation area designation. Establishing that with a trial hole beats discovering it with an open trench.
Access is the third factor and the one that most changes cost. Getting a machine to the rear of a terrace with no side entry is frequently impossible, and the job becomes a hand dig or a conveyor job, which is several times the labour for the same hole.
Everything is inspected before it is covered. Our footings and excavation page explains how we approach foundations and site preparation.