New upstairs toilet waste

2 Dec 2015
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United Kingdom
I'm planning on installing a toilet and basin in an upstairs cupboard. Its too far from the existing soil stack in the downstairs bathroom to connect to that (victorian semi).
There are three waste pipes currently going to a chamber running across my back garden several adjacent properties. There's a toilet waste pipe, bathroom sink / bath waste pipe and kitchen waste pipe. They all go into the same chamber.
Easiest way to connect the new toilet waste is run the new soil pipe along the house, down under the patio and tee into the kitchen waste.
Is this ok? It goes into the same chamber ~3m away.

Soil pipe plan.jpg
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Should be OK, but get a Building Control inspector out to discuss it as it's notifiable work under Building Regulations and you'll need them to sign it off, so they need to be happy with what you're proposing to do
Only issue I can see is access to the new run, Building Inspector may ask for a chamber to be fitted either on the change of direction or where it joins the existing drain. Depending on depth a shallow inspection chamber may suffice.

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