Building an extension if you have a public drain beneath your garden?
It happens to go roughly like this:
Thames Water see my planning permission, and tell me to apply to them.
I need to tell them where their pipe goes in relation to my extension.
I ask them to tell me where their pipe goes.
They tell me where it goes.
I draw it on a plan, and send it to them with £343
They say thank you.
You're welcome. 
s18 agreement is where the drain(public sewer)is within 3m of a new foundation ISTR,does the drain serve just your property??
The drain serves properties up the road, and a parallel one is storm water.
What bugs me is £343 to tell them where their own drain is. This boils down to me basically asking them where it is, and then telling them.
My foundation will be 2.5M away, so that classifies as "close" unfortunately.
the money is for the S18 agreement they know where the drain is that's why you've been picked up for this....does your work involve making a new connection to a drain or altering an existing one to a drain??
by the way you only need to do this 8wks prior to the work starting
if it's any consolation that's about equivalent to a band d property's rateable value for a quarter's water in the south west.
yes, meters are significantly cheaper.
Hi andylaightscat,
Thanks for the info,
My work doesn't involve making a new connection. I am going to add to an existing connection, but only from my side of my own manhole, which then already feeds into a carbunkle of a manhole belonging to TW which is down the bottom of my garden.
I am told the fee is partly to pay for their admin to file my data (Filing cabinets can get pricey I guess), and partly to pay for Thames Water's insurance. (Which is funny because I don't normally pay insurance for other folk's property). I don't get any site visits or anything..
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