Cost involved in moving manhole

markyyyyyy

Hi,

we are getting an extension and the manhole cover is in the way of the extension, so we will need to get the manhole moved along the same drain run, but to the side of the extension.

The architecht has proposed that the footings will go alongside, and then under the drainage run / pipework.

Has anyone done a similar thing? It is a brick built sewer and includes next doors drainage run into it.

What are rough costs that i can expect to move the manhole?

Thanks

Mark

Robin9

Your architect should be able to give you a guess

Doozergirl

I'd throw in about £1,000 over the cost of the extension. Materials aren't much but there is labour, additional creation of waste and dirt. They won't build a new brick one, a plastic inspection chamber is more budget efficient and practical.

There is an "In My Home" board for stuff like this.

Slinky

You'll need a buildover agreement from your water company which will also have a cost element.

Doozergirl

Slinky wrote: »

You'll need a buildover agreement from your water company which will also have a cost element.

It sounds like the architect has already told them that, hence they know they have to move it.

markyyyyyy

Slinky wrote: »

You'll need a buildover agreement from your water company which will also have a cost element.

Do we need a build over agreement even though we aren't actually building over the pipe? The brickwork will start just the house side of the pipe, with part of the footings going alongside, then under the drain run.

Either way, i have send out plans to yorkshire water for their comments on what needs to be done.

EDIT: Just researched and as it is within 3m of the sewer i need the agreement as you say

Doozergirl

markyyyyyy wrote: »

Do we need a build over agreement even though we aren't actually building over the pipe? The brickwork will start just the house side of the pipe, with part of the footings going alongside, then under the drain run.

Either way, i have send out plans to yorkshire water for their comments on what needs to be done.

Yes. A build over agreement is required if you are building within 3 metres of a shared sewer even if you weren't physically messing with the drains, which you are.

ProDave

It's usually a LOT more complicated than "move the manhole"

If there is a drain there, then you are probably not allowed to build over it. So as well as moving the manhole, you may have to divert a section of the drain, and if it serves more than just your house could be very expensive. You will probably need aditional inspection chambers wherever a new bend is formed in the process of re routing it.

Doozergirl

ProDave wrote: »

It's usually a LOT more complicated than "move the manhole"

If there is a drain there, then you are probably not allowed to build over it. So as well as moving the manhole, you may have to divert a section of the drain, and if it serves more than just your house could be very expensive. You will probably need aditional inspection chambers wherever a new bend is formed in the process of re routing it.

The OP does have an architect involved here who knows the layout better than we do and has some level of qualification and has already made a proposal. In my experience it isn't *usually* a lot more complicated than moving the inspection chamber. It can be, but it isn't *usually* and I would hope that the OP has an architect that can advise better than we can, without scaremongering.

It is still called a *build over* agreement for a reason. Water companies are usually perfectly happy for the drain to be built over as long as there is a nice straight run and still good access for clearing the drain under the extension. It's the inspection chambers that are where build over isn't wanted, usually because you have a more complicated junction and direct access is required. When the inspection chamber is in the middle of a proposed rear extension, it's usually where the house's own drains come into the shared run, so the pipe that needs diverting is their own from the house. Easily done.

Doozergirl

Why are these posts on the wrong board rarely, if ever, moved to the right one?