Shared sewage pipe under proposed extension

tom1ie

Hi all,

Im looking for a bit of advice here but basically we are thinking of getting an extension built.

There is a shared sewage pipe that a number of houses feed into (I don’t know how many) running at the back of my house in the garden, (about 5m from the back of my current house), which then feeds into a large chamber in my neighbours garden (neighbours house is the detached end house of the estate- mine is a semi d).

My house is a 1966 build.

The council drain then picks up from this chamber in my neighbours house.

The extension we are planning will extend over this shared drain- very early days, we haven’t any drawings or PP yet- just thinking and costing.

What’s the story here, do we have to get the drain diverted around the extension, can we build over the shared drain if the foundations are suitable etc etc.

Thanks for any advice.

Penn

It's always best to divert around the extension if possible, but it may not work for falls/gradient, proposed size of extension, location of access chambers etc. There are construction details for building over sewage lines that can be used. Your best bet would be to engage an engineer or similar who can review on site and provide a detail/specification for the works.

tom1ie

https://www.boards.ie/discussion/comment/121108210#Comment_121108210

Ok great thanks- who would be best to contact for this- a dedicated engineer specialising in civils or a sewage construction company or something?

Penn

https://www.boards.ie/discussion/comment/121108245#Comment_121108245

If you're engaging an architect, engineer or surveyor to design and certify the extension for you for compliance with building regulations, they should be able to advise. It's a fairly common occurance in older estates, and details are fairly standard.

lmk123

I’d probably skip the Engineer and go to a someone that does drainage, it’s simple enough to be honest, just has to check the levels of the pipe at both sides of your proposed extension and see if there’s enough of a difference to achieve a good gradient whilst diverting it around the extension, maybe there are AJ’s close by so there might not even be need to expose the pipe, either way it’s a 2 minute job to check the levels, you’d be paying an engineer for nothing in my opinion

tom1ie

https://www.boards.ie/discussion/comment/121108268#Comment_121108268

Grand.

we were thinking about looking at brightspace home improvements who specifically mention they don’t include tiling or sewage works (that’s not to say they don’t do them).