Drainage in Corby has one characteristic that follows directly from how the town was built: it was laid out as a scheme, not house by house.
When a whole estate goes in at once, the drainage is designed for the estate. Runs take the shortest sensible route across the site rather than following plot boundaries, which means a pipe serving several houses may cross the middle of your garden, and a manhole in your border may be the access point for a system that has nothing to do with your house at all. Very little of that is obvious from the covers.
The practical consequence is that an extension footprint on a Corby plot is more likely than average to sit over a shared run. Since 2011 a great many of those runs have belonged to the water company rather than to the householder, which means building over or close to one needs a build over agreement granted before the concrete goes in. It is a routine application and a serious problem to be caught without, because it emerges during a sale.
So we establish what runs where before the design is settled rather than after, and on these plots a camera survey earns its keep more reliably than in a town where each house has its own run.
Our drainage work page covers surveys, repairs and new connections.