Fitting sink and dishwasher waste pipe into drain

5 Dec 2012
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United Kingdom

we have just had an extension and the plumber has failed to turn up to install our waste pipe from the sink / dishwasher, into the drain outside. I have attached pictures of the situation. I want to get it done myself as can't rely on them.

Please can someone explain the best way to achieve this? i was hoping to fit it into the drain (that runs into the manhole / sewer) where the rain water pipe is, however i don't know how i am going to achieve this as the rainwater pipe blocks the way to the other openings in the drain....

Also, do i have to run the waste pipe horizontally out from the waste underneath the sink, and then across the brickwork outside, to the drain - or can i run the waste pipe inside and pop it out nearer the gutter to keep it a bit more concealed?

Could i cut into the rainwater pipe seeing as it goes into the same drain? If so, how do i do this - is there a suitable boss around? Struggling to find any information on the internet.

Thanks for your help!


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Is that drain actualy connect to the foul sewer? If its just rain collection or soakaway you can't connect them to it.
Run the pipework internally or externally, as you wish. As above, make sure that gulley is to a foul drain, (not a surface water drain or soakaway), then just align it to come in front of the rainwater pipe, cut one of the circles out and drop the new waste through the grid.

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