Removal of Inspection Chamber for Extension

[Daddyzord]

Evening all. 

I had an inspection chamber buried inder my old extension at the back of the house  that served my rear soil stack and a downstairs toilet.

The pipe from this chamber runs under the house into a chamber at the front. The old extension and rear chamber have both been removed and a new extension is being built.

I can't install a new chamber for the two waste pipes because it will need access and be in a prominent place .

Am I correct in thinking I need to install a stub stack with air admittance valve in the corner of my downstairs WC and run a separate pipe all the way to the inspection chamber at the front? Its approx a 12m run

The existing pipe will then serve the rear soil stack only.

I have included a diagram.

Would appreciate any advice.

 Regards

Lee

 

 

[nod]

A quick call to building control will resolve this