Can the vent for kitchen waste pipe be placed underneath the floor?

4 Oct 2020
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United Kingdom

We are doing a kitchen extension with the new sink being placed on the kitchen island in the middle of the room. The plumber has connected the waste pipe for the sink / dishwasher to the bottom part of the existing soil pipe under the ground floor board (our house is timber framed). However, the soil pipe will be relocated later to another place. But the plumber suggested that the existing soil pipe will just be cut above the connection point of the kitchen wasted pipe so it can still be used by the kitchen wast pipe. If doing this, I presume that the vent of the wast pipe will just be under the floor. Is this the right way to do it? Will that lead to any bad smell in the future?

As I don't have much knowledge of plumbing, I hope I have made it clear.

Thank you so much for any advice and suggestion.
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