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I am fortunate enough to know that the drain is a straight line from manhole to manhole, but there are unfortunately obstructions restricting me from determining the exact location and map scalings are too vague due to Thames Water not knowing the exact location.

Just spoke to the drain company. They have a crawler unit that will be used but they wish to charge me an extra £220 to have a sonde survey conducted at the same time! This sounds ludicrously expensive?!

Thanks very much for your help. It does seem strange if it did not precisely determine the location, otherwise how would they get on with much more intricate building projects such as Crossrail when they need almost millimetre precision.

Hi, Thanks again for replies, the depth quoted is the invert level of the pipe - at one man hole it is 3250mm and at the other it is 2850mm. The corners with the circles on the drain map are the manholes - it is quite difficult to plot the exact location using standard mapping and even Thames...

Thanks for your reply. As part of the Thames Water Buildover Agreement, I have to have a CCTV survey before and after along with a lateral site survey at a cost of c£1,300.

Hi all, We have planning permission for a single storey extension to our detached property. Building work was set to commence this week, however between Christmas and New Year we were alerted to a Thames Water 825mm Storm Drain running beneath our planned construction site. I have spoken with...