converting an external drain to an internal drain

15 Dec 2008
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United Kingdom
I am about to extend my kitchen. Currently the drain that collects the waste from the sink, washing machine e.t.c is directly outside the kitchen underneath the window.
When I do the extension this drain will therefore be inside the new kitchen. I want to keep the drain in the same position as the new kitchen is to have a peninsular unit with the sink basically being in the same location as the old sink.
What I am unsure about is what to use to convert the old external clay hopper to a satisfactory internal drain with no smells entering the house.
For building control purposes I have to either have a cctv survey, or expose the current drains so I was thinking of breaking into the drain run just outside the new extension, fitting a collar and then running new plastic fittings up into the kitchen, but I am unsure as to the type of hopper to use internally, and whether this is the best way to go about it. Any ideas would be great.
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