Hi,
we are currently having our extension built and discovered a sewer pipe running that serves every 4 properties in our bungalow estate. Thames water have sent a letter to let us know that we will need a build over agreement as there is a manhole that will need to be moved. When we bought the house 4 years ago it had a conservatory at the rear and we have planning permission to knock down the conservatory and built a solid structure. Upon lifting the manhole there is a straight pipe that runs at the rear of our property and there is a pipe that comes from our properly and joins it, more like a Y shape.
They have told us that we need to make a new manhole 1 metre deep and run a pipe to the existing sewer and connect it with a Y pipe and then we need to to something they call a grubbing up process to seal the existing manhole so it is no longer in use. WE don't really have any idea how tho works, spoken to the builder and he said he was just going to leave the existing manhole and put a double seal cover on it and run a pipe to a new sewer to access it in the future. I told him it has to be done properly as thames water said that they will come down to inspect it as i have to apply for a retrospective build over as most of the wall are up and roof too and didn't know anything about this build over until this letter popped through.
Any help on what they want us to actually do and process involved and what do they mean by sewer needs to be grubbed up. I have attached a pic below to show whats under the existing manhole.
thanks
we are currently having our extension built and discovered a sewer pipe running that serves every 4 properties in our bungalow estate. Thames water have sent a letter to let us know that we will need a build over agreement as there is a manhole that will need to be moved. When we bought the house 4 years ago it had a conservatory at the rear and we have planning permission to knock down the conservatory and built a solid structure. Upon lifting the manhole there is a straight pipe that runs at the rear of our property and there is a pipe that comes from our properly and joins it, more like a Y shape.
They have told us that we need to make a new manhole 1 metre deep and run a pipe to the existing sewer and connect it with a Y pipe and then we need to to something they call a grubbing up process to seal the existing manhole so it is no longer in use. WE don't really have any idea how tho works, spoken to the builder and he said he was just going to leave the existing manhole and put a double seal cover on it and run a pipe to a new sewer to access it in the future. I told him it has to be done properly as thames water said that they will come down to inspect it as i have to apply for a retrospective build over as most of the wall are up and roof too and didn't know anything about this build over until this letter popped through.
Any help on what they want us to actually do and process involved and what do they mean by sewer needs to be grubbed up. I have attached a pic below to show whats under the existing manhole.
thanks