Inspection Chamber in proposed extension

18 Jan 2021
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United Kingdom

I am currently planning an extension and this would be over an existing garage that has an inspection chamber.

I have done a rough drawing of the current setup - I know there are build over agreements but I wouldn’t want an inspection chamber inside so are the any options of moving it out into the garden?

The neighbours out house only flows into the same run so I think that’s why the inspection chamber is there as it’s a junction?


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You wont be permitted to have a chamber inside whether you would want it or not

If you can access the pipes and there is enough fall to the new location, the chamber can be moved.
Ok thanks

If you see the image - I can move backwards as that is my garden but cannot move the chamber to the left.

Would moving it backwards be an option - not sure if the inspection chamber HAS to be where the junction is?

All sections of a drainage system need to be accessible for maintenance and cleaning as required, chambers are usually required at every change in direction and/or depth of the sewer. If the sewer is taking effluent from a neighbour then it becomes the Water Company's asset from the point where it enters your property/becomes shared and you'll need their say so to make any alterations.

They may ask the incoming pipe is rerouted to connect in a new chamber outside the footprint of the proposed extension.
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The chamber can be moved back into the garden as long as you have the falls to connect everything there. It may need two extra chambers for the two diverted pipes. There might be options to connect things without additional chambers, as long asd there are provisions for rodding from somewhere.

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