how do I go about moving an internal drain invert?

5 Feb 2012
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United Kingdom
I have an internal soil stack in a Chalet Bungalow which I would like to move allowing me to create an open plan kitchen dinner. The drain invert is 1 meter into the kitchen, the stack then goes straight up through the bathroom and out of the flat dorma roof. I would like to move the stack across to the wall and then bend in the sloping roof space back into the bathroom above and out the existing hole in the roof. I hope to t the toilet pipe in, in the sloping roof space behind the toilet. Can anyone offer me any help and advise? Is there anything I should be aware of regarding building regs? Thanks,
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