We are currently in the beginning stages of drawings for an extension that will build over our drains
Our architect has advised we get a CCTV (or GPS mole if possible) survey of our drains so we can map the connections, find if the neighbour links into our system, and most importantly find out how deep it runs so we know in advance how deep the foundations will need to be.
I've tried googling, and posting on a local site to find a company to do this, but seem to come up mostly with cctv to find blockages.
Has anyone had a similar survey done? Know what a reasonable price would be (semi detached house in the SE), or amazingly, have a recommendation of a company to use?