Downstairs toilet


24 Nov 2017
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United Kingdom
Hi, I’m trying to figure out how best to go about a little project of installing a downstairs toilet and sink, the drainage is the bit I’m stuck on so any help will be greatly appreciated.

I’m planning on putting a toilet and sink in our garage. In picture 1 you can see the existing set up in our garage (apologies for the artwork, was never any good). There is a bottle trap in the corner that the kitchen waste runs into, which then runs into the man hole. The existing upstairs bathroom soil pipe comes into the man hole on the right.

Picture 2 shows what I want to do, put a toilet in and reroute the waste pipe which is 110mm to the toilet. Have a small sink added to the right of the toilet with this waste going into the WC connector. I then wanted to route the kitchen waste into the pipe that the toilet will be connected to, is this allowed? Also would I need a soil vent pipe, as there is already one from the main bathroom? I’ve looked online but I’m getting more confused. Thanks.


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