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The chamber is around 4m away, and the drain runs round ~45degrees before it gets there. Flushing the downstairs WC doesn’t cause a rush, and hopefully the bends will slow down traffic from the en-suite. I don’t think there will be much use - it’s primarily night time use and morning wash...

Branch 2 m above invert of drain?

That’s what I was hoping to do, but I was concerned about the branch being > 2m rule. Would it need venting, or could I keep the AAV? There’s a window just round the corner

Thanks for the replies. It's looking like I have a problem with a proposed project. I had hoped to install an ensuite with just toilet and basin in a bedroom on what is, from a drainage point of view, the first floor. The existing soil and vent pipe is on the back of the house, and it drains...

I'm confused. I have a ground floor toilet that discharges to a stack outside which in turn runs to the main drain. The stack outside is about 1m higher than the soil pipe from the toilet, and terminates in an AAV. I've seen a post somewhere that suggest that if the stack is ventilated, it isn't...